Semi-quantitative Risk Assessment Method Research Articles

Health Risk Assessment from Exposure to Ambient Volatile Organic Compounds (VOCs) at a Truck Tire Factory in the Yangtze River Delta, China

Occupational health risk assessments of exposure to VOCs still need to be extensively studied to improve the safety standards in the industry. Based on the monitoring of organic pollutants at various workstations in a truck tire factory in Jiangsu Province, both semi-quantitative and quantitative health risk assessment methods were employed to assess health risk levels. The findings indicated that VOCs were categorized into five classes, which included alkanes, aromatics, halocarbons, carbon disulfide, and oxygenated volatile organic compounds (OVOCs). The highest concentration of total volatile organic compounds (TVOCs) was found in shaping workshop; alkanes were the most abundant class (74.2%), followed by aromatics (24.02%) and OVOCs (1.96%). Although the results of the semi-quantitative risk assessment showed that most of the organic compounds had low R values, various kinds of VOCs were detected; particularly, many harmful organic compounds (such as toluene, ethyl benzene) were detected in all the sampling sites. The quantitative risk in the calendering and vulcanizing workshop exceeded the acceptable level; both the carcinogenic risk of ethylbenzene in the tire-strip storage room, and trichloroethylene and perchloroethylene in the calendering workshop were unacceptable. Thus, the calendering and vulcanizing processes in rubber tire manufacturing should be priority-controlled processes.

Presenting a Semi-quantitative Model Based on the Resiliency Engineering Management Commitment Index in Assessing the Level of Preparedness Against Emergency Situations of Hospitals in a Fuzzy Environment (Case Study: Selected Faraja Hospitals in 2021)

Background and Objective: The main index in resilience engineering is the management commitment index. This study implemented a semi-quantitative risk assessment method based on the fuzzy hierarchical analysis method for the management commitment index to evaluate the resilience level of two selected hospitals. Materials and Methods: First, evaluation tools were designed, and their validity was determined. They included a 17-question hierarchical analysis questionnaire, a four-question management commitment risk assessment form, and a two-question integrated management commitment risk assessment form with safety, health, and environment. They were then distributed at Al-Ghadir Hospital in Tabriz and Khatam Al-Anbia Hospital in Bandar Abbas (affiliated with Faraja) and analyzed with relevant statistical methods. Results: The evaluation of the fuzzy hierarchical analysis questionnaire showed that the level of resilience had increased from 15.25 in 2018 to 36.37 in 2019. Additionally, the levels of social readiness, sharing, and resilience risk were 0.97, 0.17, and 0.03 in Al-Ghadir Hospital and 0.96, 0.11, and 0.04 in Khatam Al-Anbia Hospital, respectively. Moreover, the cumulative readiness value of management commitment based on safety, health, and environment in these two hospitals was 0.81 and 0.74, respectively. Conclusion: Based on the results, it is suggested that the selected hospitals focus on the effective parameters introduced in the evaluation tools of this study to increase their resilience level.

Presenting a Semi-quantitative Model Based on the Resiliency Engineering Management Commitment Index in Assessing the Level of Preparedness Against Emergency Situations of Hospitals in a Fuzzy Environment (Case Study: Selected Faraja Hospitals in 2021)

Background and Objective: The main index in resilience engineering is the management commitment index. This study implemented a semi-quantitative risk assessment method based on the fuzzy hierarchical analysis method for the management commitment index to evaluate the resilience level of two selected hospitals. Materials and Methods: First, evaluation tools were designed, and their validity was determined. They included a 17-question hierarchical analysis questionnaire, a four-question management commitment risk assessment form, and a two-question integrated management commitment risk assessment form with safety, health, and environment. They were then distributed at Al-Ghadir Hospital in Tabriz and Khatam Al-Anbia Hospital in Bandar Abbas (affiliated with Faraja) and analyzed with relevant statistical methods. Results: The evaluation of the fuzzy hierarchical analysis questionnaire showed that the level of resilience had increased from 15.25 in 2018 to 36.37 in 2019. Additionally, the levels of social readiness, sharing, and resilience risk were 0.97, 0.17, and 0.03 in Al-Ghadir Hospital and 0.96, 0.11, and 0.04 in Khatam Al-Anbia Hospital, respectively. Moreover, the cumulative readiness value of management commitment based on safety, health, and environment in these two hospitals was 0.81 and 0.74, respectively. Conclusion: Based on the results, it is suggested that the selected hospitals focus on the effective parameters introduced in the evaluation tools of this study to increase their resilience level.

Chemical Industry Disaster Risk Assessment During Complex Emergencies in Ukraine.

Introduction:The war in Ukraine has not only led to complex emergencies and humanitarian crises but also other severe consequences, such as the chemical industry disaster. The chemical industry is one of the principal sectors of Ukraine’s economy, and it is estimated that Ukraine has a total volume of hazardous chemical accumulation of more than 5.1 billion tons. An attack on chemical industrial facilities will lead to catastrophic consequences. This thesis aims to study the disaster risk of chemical industrial facilities and its consequences on public health and the environment during complex emergencies in Ukraine.Method:Observational cross-sectional risk assessment method was utilized to assess hazard, vulnerability, and exposure of the chemical industry in Donetsk Oblast, Luhansk Oblast, Kherson Oblast, Zaporizka Oblast, and Kharkiv Oblast, Ukraine. Data on chemical factories in Eastern Ukraine was collected on Google Maps and Google Earth in May 2022. Lastly, the semi-quantitative risk assessment method was utilized to describe the risk from the perspective of consequences for life and health, the environment, property, and speed of development.Results:Chemical industry disaster risks in Ukraine during complex emergencies in Donetsk Oblast, Luhansk Oblast, Kherson Oblast, Zaporizka Oblast, and Kharkiv Oblast are high in terms of likelihood and consequences to life and health, environment, property, and speed of development.Conclusion:This risk assessment enables potential chemical disaster risks in Ukraine during complex emergencies to be understood and communicated by the local community, the first responder, and till policy makers. Therefore, enable a whole-of-society approach involving risk management, disaster preparedness, and response. Further detailed risk assessment on the type of chemical and their hazards should be conducted once the situation permits.

Novel Google Maps and Google Earth application for chemical industry disaster risk assessment during complex emergencies in Eastern Ukraine

The war in Ukraine has led to complex emergencies, humanitarian crises, and other severe consequences, such as chemical industry disasters. The chemical industry is one of the principal sectors of Ukraine’s economy. In 2019, Ukraine had a total volume of hazardous chemical accumulation of more than a 5.1billion tons. Therefore, an attack on chemical industrial facilities will lead to catastrophic consequences such as chemical disasters. This paper aims to study the disaster risk of chemical industrial facilities and its effects on public health and the environment during complex emergencies in Eastern Ukraine. Observational cross-sectional risk assessment method was utilized to assess hazard, vulnerability, and exposure of the chemical industry in Eastern Ukraine in Donetsk Oblast and Luhansk Oblast. Data on chemical factories in Eastern Ukraine was collected on Google Maps and Google Earth on May 2022. Lastly, the semi-quantitative risk assessment method was utilized to describe the risk from the perspective of consequences for life and health, the environment, property, and speed of development. Our disaster risk assessment found more than 1 million people (1,187,240 people) in Donetsk Oblast and more than 350 thousand people (353,716 people) in Luhansk Oblast are exposed to potential hazards from the chemical facilities clusters. The aggregation risk of bombardment of chemical facilities cluster in Eastern Ukraine is also high due to ongoing war. Therefore, the chemical industry disaster risks for Eastern Ukraine during complex emergencies in Donetsk Oblast and Luhansk Oblast are high in terms of likelihood and consequences to life and health, environment, property, and speed of development.

Work environment risk management at petrol stations

Work environment risk factors have a big influence in the daily life of employees at every company and work environment. In this study, a wide-ranging work environment risk assessment was carried out, using qualitative, quantitative, and semi-quantitative risk assessment methods, comparing the obtained results, and influencing factors, as well as evaluating the work environment management system and recommending possible improvements in its future development. The importance of the topic is justified by the fact that petrol stations are sites of heightened danger, where employees must pay greater attention to ensuring and maintaining a safe and secure environment to prevent the transformation of potential risks into real accidents or incidents. The work was developed at a company in Riga, Latvia, and station surveys were conducted in March 2021. As part of the work environment risk assessment process, four petrol stations in Pardaugava, Riga, were chosen for the risk assessment and measurements. In addition to station evaluations, an employee survey was conducted at 66 petrol stations throughout Latvia.

Comparison of the chemical health risk assessment of exposure to metal fumes for the furnace operator of a foundry industry using quantitative and semi-quantitative methods

Heavy metals have several adverse effects on the workers' bodies due to their accumulation in the vital organs. Besides that, the current study aimed to assess the health risk of exposure to metal fumes for furnace operators working in a foundry industry based on the three different methods. The current sectional descriptive-analytical research conducted on a foundry industry in Isfahan (Iran) in 2022. Three common methods currently available, including the Semi-Quantitative Risk Assessment Method (SQRCA) and two methods provided based on the US-EPA provided technique, were used in this study. At first, the extent of people's exposure to metal fumes of Fe, Ni, Cr, and Mn was measured. Then, the chemical risk assessment of exposure to these metals' fumes was done using the three methods, and their results were compared. The SPSS Ver.25 has been used for data analysis and comparison in the current study. Results indicated that the furnace operator's exposure to all four metals was above the allowed limit of occupational exposure. The chemical risk assessment results also showed that in the first method (US-EPA-based), the risk of exposure for all workers was acceptable, while in the second method (SQCRA), the risk level of a majority of workers was medium, and in the third method (US-EPA-based), the risk level of a majority of workers was not acceptable. Comparing the methods showed that average risk scores in the first and second methods were significant compared to the exposure to fumes with equivalent concentration (Pvalue<0.05). The average score of carcinogenicity risk in method 3 was significant compared to the concentration of chromium and nickel (P-value < 0.05), but it was not significant for iron and manganese and the non-carcinogenic risk of chromium and nickel. Chemical exposure risk level for the furnace operator was approximately moderate in all three methods. In terms of complexity and information required to implement the method, all three methods were almost the same, with the difference that the results of the first method cannot be generalized to other people who have the same job conditions because individual information such as a person's weight is used to calculate its score.

Vulnerability of endemic bilih fish Mystacoleucus padangensis Bleeker, 1852 in Lake Singkarak, West Sumatra, Indonesia

Bilih fish (Mystacoleucus padangensis) is an endemic species in Lake Singkarak, West Sumatra, Indonesia. It has high economic value, rich in nutrition and as an export commodity. Bilih dominated the catch in Lake Singkarak. The excessive fishing causes fish population decline. There has been an indication of stock decrease and overfishing exploitation status. Fisheries management needs to carry out to maintain the sustainability of bilih fish. This study was conducted to determine the vulnerability status of bilih fish as an information for bilih fish management. Data analysis was carried out using Productivity and Susceptibility Analysis (PSA). PSA is a semiquantitative risk assessment method used to assess the impact of fisheries on fish stocks. Based on 11 productivity and 12 susceptibility attributes, this study was conducted. The results showed that the vulnerability index was in the high category (v=2.1) and the productivity parameter value (p=1.3) lower than the susceptibility value (s=2.3), indicating bilih status is vulnerable to over fishing and need to be maintained.

Semiquantitative Risk Assessment Method for Groundwater Source Protection Using a Process-based Interdisciplinary Approach

Potable groundwater resources are at risk as a result of industrial development and an increase in fertilizer use. Protection of the groundwater supply may require the establishment of groundwater source protection zones (GSPZs) to allow the implementation of protective measures. The aim of this study was to develop a new approach to groundwater source risk assessment (GSRA). The risk was defined as the highest of the risks identified for individual potential sources of contamination (PSCs). The risk resulting from a given PSC is the combination of its adverse impact on groundwater, unwanted event probability, and adverse effect and annoyance to the population. A multicriteria assessment method was designed to estimate indices of the potential groundwater impact of industrial facilities and noninert waste landfills with the range and weight method. Application of the proposed approach was tested considering an idealized model and three scenarios involving various industrial PSCs and fertilization practices. The overall nitrogen load was compared to the maximum effective nitrogen load for the crops in question. Sensitivity analysis of this methodology revealed that the main factors influencing the risk to the water supply include the nonreactive contaminant mass load in PSC leachate and the ratio of the groundwater volume abstracted from wells to the amount of water flowing from PSCs into wells, which determines the dilution degree of the contaminant mass. This proposed interdisciplinary approach to GSRA provides a robust basis to reach decisions on GSPZ establishment and the development of a groundwater risk analysis methodology.

Occupational health risk assessment at healthcare institutions: Developing a semi-quantitative risk method.

Environmental hazards in healthcare institutions affect the quality of patient care as well as personnel and patient safety. The aim of this study was to develop and apply a semi-quantitative risk assessment method to calculate occupational health risk levels with regard to the sensitivities of healthcare institutions. The present research was conducted in three phases. In phases 1 and 2, the model was developed using a review of different risk assessment methods, extracting expert opinions (N =10) through semi-structured interviews, and using the fuzzy analytical hierarchy process (FAHP). In phase 3, in order to validate the proposed method, one of the five public hospitals was randomly selected and a case study comprising 6 sections was performed. A total of 43 health risks were identified and evaluated using the present method, 41.86% of which were at very high levels, 16.27% at high levels, 30.23% at substantial ones, 9.3% at medium and 2.32% at low levels. The highest health risks were found in paraclinical and operating room wards. To overcome the shortcomings of the proposed health risk assessment methods, a semi-quantitative method was used in the present study to more accurately calculate the risk levels in the healthcare institutions and also calculate the risk level of each hospital unit. The proposed semi-quantitative method can be used as a tool for assessing occupational health risks as a key element of risk management. In addition, by focusing on an appropriate framework for occupational health risk assessment, specialists in the organization will be able to take significant and effective steps to implement an efficient risk management system.

Research on Fast Semi-Quantitative Risk Assessment Method for High Temperature and High Pressure Gas Wells

Aiming at the problem that the existing risk assessment methods in China cannot simply and accurately assess the safety risk of gas wells, a rapid semi-quantitative risk assessment method for gas wells under high temperature and pressure is studied. Based on the rapid risk assessment method of annulus well with pressure in Chevron Company and the existing risk assessment methods, the well barrier and annulus pressure of high temperature and high pressure gas wells are fully considered. A rapid semi-quantitative risk assessment method for high temperature and high pressure gas wells is established, which takes the annulus pressure value, well service life, annulus pressure recovery after pressure relief, reservoir conditions (formation pressure, production) and well CO2 and H2S content as the key risk indexes. The method is applied in a gas field, and the risk value and risk grade of a practical well are semi-quantitatively evaluated. The overall risk situation of the well is obtained. The research results provide important technical guidance for the safe production of gas well.

Inhalable wood dust: Risk assessment of Occupational exposure

Background and Purpose: Wood dust have been approved as a harmful and carcinogenic agent for humans. This study aimed to evaluate risk assessment of Workers' exposure to inhalable wood dust among 100 workers in 25 furniture manufacturing workshops in one of the northern cities in Iran.Materials and Methods: NIOSH0501 method was used to assess the occupational exposure to Inhalable wood dust and Semi-quantitative risk assessment method recommended by Singapore Department of Occupational Health was used to assess risk level of occupational exposure. Airborne particles were collected from the workers' breathing zone using calibrated personal sampler pump and a PVC filter with a 25 mm diameter, 5 µm pore size embedded inside an IOM Sampler.Results: The mean occupational exposure to inhalable wood dust among all exposed workers was found to be 22.3 ± 6.9 (Mean ± SD) mg.m-3. The risk level of workers' exposure to inhalable wood dust was also documented to be in medium level in all workshops. In addition, the researchers found that among environmental variables, the door area of workshops was the most effective predictor variable to predict variations of workers' exposure to inhalable wood dust (ADJ.R2=0.113, R2=0.122, p&lt;0.001).Conclusion: Exposure to inhalable wood dust was several times higher than the OEL of Iran and TLV recommended by ACGIH. Since the risk level of workers' exposure to inhalable wood dust was in medium level, their health could be threatened by prolonged exposure. Therefore, technical-engineering and managerial controls seemed to be necessary.

Design, Fabrication and Risk Assessment of IoT Unit for Products Manufactured in Industry 4.0 Factory

This paper deals with the design, fabrication and risk assessment of IoT unit to reliability improvement of products manufactured in the Industry 4.0 factory. The collected data from the manufactured products can provide feedback to the manufacturing company via the Internet of Things (IoT). The manufacturer can realize the optimization of the whole product and also its production process based on these data through digitization and other analyses. On the other hand, the customer can prove due to these data that the product was used within the technical conditions specified by the manufacturer. In the paper, the IoT unit with temperature and humidity sensors was designed. After that, the risk analysis of the design with a semi-quantitative risk assessment method was applied. Then, the four prototypes of the demonstration unit were made and tested. After the testing, recalculation of the risk analysis was realized. At the end, the recommendation of high risks mitigation were presented.

Proposed evacuation safety index (ESI) for school buildings

Purpose Schools are vulnerable to strong-magnitude earthquakes. The purpose of this study is to develop a seismic evacuation safety index (ESI) to assess school’s safety as a function of the following parameters: means of egress, disaster preparedness and disaster response. Moreover, the study aims to simulate and study an evacuation model to estimate evacuation time for a realistic understanding of the evacuation processes. Design/methodology/approach The paper used a semi-quantitative risk assessment method in developing the ESI. This was used to evaluate schools and classify them according to their level of evacuation safety. To estimate the evacuation time of each school, cellular automata theory and static floor field were used. Findings The paper provides primary school stakeholders important parameters that they should consider in preparing pre-disaster plans to ensure safe evacuation of school children. Research limitations/implications ESI focuses only on the means of egress, disaster preparedness and disaster response as the contributing factors. The structural conditions of each school building and assessment of non-structural elements are not considered. Practical implications The ESI and the evacuation model can be used as a basis for evacuation planning and decision-making. This can help building owners and administrators in strengthening their disaster risk management plan by enforcing mitigating measures. Originality/value ESI is an original idea and fills the gap regarding the safe evacuation of school children especially during a major seismic event.

A semi-quantitative Risk assessment method in process plants: confined spaces

The purpose of the present work was to develop a methodology for the confined spaces risk assessment in the workplace. Within the technological risk function, R=PxD, in order to account for the specific features of confined spaces, the probability of occurrence P was defined in two indices: the frequency of exposure to confined spaces, F, and the contact time I (strictly related to the complexity of the intervention that must be performed). The damage M has been separated into specific parameters considering the energy, the environment and the geometry of the confined space under examination, and in detail:an incorrect or not correctly signalled insulation that may lead to a sudden operation of part of the system with consequent accidental leakage of fluids or substances inside the confined space and / or movement of any mechanical part, with the energy damage factor DE;the atmosphere present in the confined space, which may be poorly oxygenated, corrosive, harmful, toxic or potentially explosive, with the environment damage factor DA.Moreover, as a specific corrective factor of damage factors, the criticality of the physical and geometrical characteristics of the confined space is evaluated, considering how it's easy for the worker to leave the confined space or to be rescued if he feels bad, with the factor of FCDG geometry damage correction. Once the damage factors have been identified and corrected with the FCDG factor, the specific risks of the confined space are evaluated by multiplying each damage factor by the probability of occurrence P, thus obtaining the index of:Risk of contact with hazardous substances or with moving mechanical parts;Asphyxiation risk;Chemical risk;Risk of fire and explosion.The application of this method to the confined spaces of a real process plant allowed to validate the methodology.

Application of three semi-quantitative risk assessment methods in electroplating enterprises

Objective: To apply the semi-quantitative risk assessment model in the Technical Guidelines for Occupational Health Risk Assessment of Chemical Hazardous Factors in the Workplace to assess the occupational health risk of electroplating enterprises and explore its applicable conditions and characteristics. Methods: Three electroplating enterprises were selected as the research objects. Occupational hygiene survey and hazard factor detection were conducted on the spot. Three semi-quantitative risk assessment methods were used to assess the risk, and the evaluation results were compared. Results: The consistency between the contact index method and the comprehensive index method was strong. The weighted Kappa value was 0.946 and the P value was less than 0.001, but the consistency between the contact ratio method, the contact index method and the comprehensive index method was poor. The weighted Kappa value was 0.345 and 0.391, and the P value was 0.009 and 0.004, respectively. When the contact concentration is less than 50% OELs, the evaluation results of the contact ratio method are lower than those of the exponential method and the comprehensive exponential method. The consistency of the three methods was the highest when the contact concentration (>50%) and (<OELs). When the contact concentration >OELs, the results of the contact ratio method are higher than those of the index method and the comprehensive index method. Conclusion: Contact ratio method is suitable for occupational health risk assessment under the condition of incomplete occupational health information and for enterprise managers to identify key control points of health risk through self-assessment; Contact index method is suitable for hazard risk assessment of occupational hazards without sampling test conditions or OELs, and pre-assessment of occupational hazards of construction projects without access to analogical test data. The index method is suitable for occupational health risk assessment with available testing data and complete occupational health information.

Application of semi-quantitative risk assessment method in occupational health risk assessment of wooden furniture manufacturing enterprises

Objective: To explore the applicability of semi-quantitative risk assessment methods in wood furniture manufacturing companies. Methods: Two medium-sized wooden furniture manufactures were randomly selected as research objects, namely A company and B company. Used the Semi-Quantitative risk assessment method (the ratio method, the index method and the comprehensive method) in the "Guidelines for occupational health risk assessment of chemicals in the workplace" (GBZ/T 298-2017) to conduct occupational hygiene survey, occupational hazard factor testing and occupational health risk assessments for two wood furniture manufacturers from January to October 2018, and compared and analyzed the applicability of these three semi-quantitative risk assessment methods in wooden furniture manufacturing enterprises. Results: The occupational health status of A enterprises was worse than that of B enterprises, and the occupational health risk level was higher than that of B enterprises, and the risk level of A enterprise is 3~4, and the risk level of B enterprise is 2~3. The occupational health risk level obtained by the index method was consistent with the comprehensive method, while the risk level of some occupational disease hazards used the ratio method was inconsistent with the results of the index method and the comprehensive method. Compared with the index method and the comprehensive method, when E/OEL<0.5 or E/OEL≥2, there might be a certain fluctuation in the occupational health risk level obtained by the ratio method. Conclusion: The semi-quantitative risk assessment is more objective, comprehensive and flexible in the application of occupational health risk assessment, and can assess the occupational health risk level of chemical poisons in wood furniture manufacturing enterprises.

Development and in vitro evaluation of pH-independent release matrix tablet of weakly acidic drug valsartan using quality by design tools

The main objective of this study was the development of pH-independent controlled release valsartan matrix tablet in Quality by design (QbD) framework. The quality target product profile (QTPP), critical quality attributes (CQAs) and critical material attributes (CMAs) were defined by science and risk-based methodologies. Potential risk factors were identified with Fishbone diagram. Following, CMAs were further investigated with a semi-quantitative risk assessment method, which has been revised with mitigated risks after development and optimization studies. According to defined critical material attributes, which one of them was determined to be the dissolution, formulation optimization study was performed by using a statistical design of experiment. Formulation variables have been identified and fixed first with a ‘One factor at a time (OFAT)’ approach. After OFAT studies, a statistical experimental design was conducted with the most critical material attributes. Statistical design space and mathematical prediction equations have been developed for dissolution and hardness, which is important to predict drug dissolution behavior. In conclusion, a pH-independent release has been achieved for weakly acidic drug valsartan with a deeper understanding of drug product quality, with the science and risk-based approaches of QbD tools.

Evaluating the semi-quantitative risk of occupational exposure to chemicals in one of the petrochemical industries

Among the work-related risk factors in different industries exposure to chemicals can be mentioned that can have irreparable danger to staff. Therefore, to reduce the risk of exposure to chemicals in the workplace, risk assessment takes place. Thus, the aim of the present study is to study the semi-quantitative risk of chemicals. This study was conducted using semi-quantitative risk assessment method provided by the Singapore Ministry of Labor Health and Safety Unit in Olefin unit of one of the petrochemical industries located in Special Zone Asalooyeh in 2015. Seven chemical substances are identified in this unit that only one of them (14.2 percent) has a high risk level. The results showed that in this unit Sodium hydroxide (caustic) with quantitative risk level of 4.3has the highest risk factor. For this reason, control measures should be used to reduce the risk of exposure to sodium hydroxide.

Chemical risk assessment in a chemical laboratory based on three different techniques

Background: The use of chemicals is essential in education resulting in exposure to these pollutant in a variety of chemical and research laboratories. Chemical contaminants in chemical laboratories are in different forms and chemical exposure risk assessment is important for choosing appropriate controls in protecting the health of operators, experts and students. For risk assessment in chemical exposures, several techniques were introduced that their use should be assessed. This research was done with the aim to introduce the most appropriate technique in chemical risk assessment by using three chemical risk assessment techniques. Materials and Methods: This was a descriptive research done in one chemical laboratory. This research had been defined in several stages: in the first phase, the list of solid and liquid chemicals were prepared and full physicochemical properties of substances as well as toxicity and health risk of them were collected. Finally Chemical Risk Management Self-Assessment Model (Chem-SAM), University Of Wollingong (UOW) risk assessment and semi-quantitative risk assessment method (SQRA) methods were used and compared. Results: There was significant difference between SQRA methods and UOW technique while no significant difference was observed between SQRA methods and Chem-SAM model. Conclusions: All three techniques are simple, but the results were similar in SQRA methods and Chem-SAM model, so these two methods can be replaced in chemical risk assessment. In order to control the identified risks, this research has recommended programs, control measures, improving local exhaust ventilation systems, personal protective equipment and training of personnel.