Chemical Water Quality Research Articles

Twenty Years of Research in Ecosystem Functions in Aquatic Microbial Ecotoxicology.

One of the major threats to freshwater biodiversity is water pollution including excessive loads of nutrients, pesticides, industrial chemicals, and/or emerging contaminants. The widespread use of organic pesticides for agricultural and nonagricultural (industry, gardening, etc.) purposes has resulted in the presence of their residues in various environments, including surface waters. However, the contribution of pesticides to the deterioration of freshwater ecosystems (i.e., biodiversity decline and ecosystem functions impairment) remains uncertain. Once in the aquatic environment, pesticides and their metabolites can interact with microbial communities, causing undesirable effects. The existing legislation on ecological quality assessment of water bodies in Europe is based on water chemical quality and biological indicator species (Water Framework Directive, Pesticides Directive), while biological functions are not yet included in monitoring programs. In the present literature review, we analyze 20 years (2000-2020) of research on ecological functions provided by microorganisms in aquatic ecosystems. We describe the set of ecosystem functions investigated in these studies and the range of endpoints used to establish causal relationships between pesticide exposure and microbial responses. We focus on studies addressing the effects of pesticides at environmentally realistic concentrations and at the microbial community level to inform the ecological relevance of the ecotoxicological assessment. Our literature review highlights that most studies were performed using benthic freshwater organisms and that autotrophic and heterotrophic communities are most often studied separately, usually testing the pesticides that target the main microbial component (i.e., herbicides for autotrophs and fungicides for heterotrophs). Overall, most studies demonstrate deleterious impacts on the functions studied, but our review points to the following shortcomings: (1) the nonsystematic analysis of microbial functions supporting aquatic ecosystems functioning, (2) the study of ecosystem functions (i.e., nutrient cycling) via proxies (i.e., potential extracellular enzymatic activity measurements) which are sometimes disconnected from the current ecosystem functions, and (3) the lack of consideration of chronic exposures to assess the impact of, adaptations to, or recovery of aquatic microbial communities from pesticides. Environ Toxicol Chem 2023;00:1-22. © 2023 SETAC.

Use of Epiphytic Diatoms in Cyperus Papyrus L. As Bioindicators in the Assessment of the Health of the Upper Euphrates River Between the Haditha Dam and Al-Baghdadi, Iraq

The aim of this study is to use epiphytic diatoms in Cyperus papyrus L. plant as biological indicators for estimating the water quality of the upper Euphrates River between Haditha Dam and Al-Baghdadi. Biodiversity and biological indicators for water quality estimation, along with the Canadian Water Quality Index. The study showed that the water of the upper Euphrates River is warm, light alkaline, the electrical conductivity and the total dissolved soled of water affected by agricultural land water and human activities, turbidity, total hardness and the biological oxygen demand, chloride and sodium did not exceed the permissible limits, while the values of calcium, nitrate and phosphate exceeded the permissible limits. And that the calcium values have exceeded the magnesium values, and that the water in the river is well ventilated. We have identified 130 species of epiphytic diatoms in Cyperus papyrus L. plant, including 6 species (5%) belonging to the centrales diatoms and 124 species (95%) belonging to the pennales diatoms, and the highest total number of cells of the epiphytic diatoms was recorded as 1322.3 cells x 103 / gm in site I. The values of physical and chemical factors, ecological indices, and water quality index agreed that the water of the upper Euphrates River is of moderate pollution, medium biodiversity, mesotrophic, and homogeneous in the presence of species.

Assessment of Borehole Water Quality in Usmanu Danfodiyo University Sokoto (Permanent Site), Nigeria

It is acknowledged that access to high-quality water is crucial for any significant human development. Ten boreholes were used in obtaining the water sample. The samples were analyzed using the American Public Health Association (APHA) suggested procedures. The test parameters were compared to the chemical drinking water quality guideline established by the World Health Organisation. In a situation where the value is not provided, we relied on other pieces of literature. The research shows that the alkalinity, iron (Fe+), calcium (Ca2+), magnesium (Mg+), nitrate (NO3-), pH, conductivity, phosphate (PO43-), and total hardness (CaCO3) are all in line with the guidelines permissible limit which means are within the no-problem zone limits for health. While copper (Cu2+) was found to be within the permissible limit 2 mg/L in all the samples but BH1 (Junior Staff Quarters) 3mg/L which has health problems such as digestive disturbances, problems with the central nervous system, mucosal irritability, Wilson's illnesses, and liver and kidney damage.

Effect of Climate Change and Human Activities on Surface and Ground Water Quality in Major Cities of Pakistan

In this study, climate change and human impacts on water quality in five major urban areas of Pakistan, including Karachi, Lahore, Peshawar, Abbottabad, and Gilgit, were determined. Secondary data on various physical, chemical, and bacteriological water quality parameters were taken from published papers, reports, and theses. Surface and groundwater were the major sources of drinking water in these cities. The physicochemical parameters were total turbidity, pH, dissolved solids (TDS), sulphates, chlorides, calcium, sodium, HCO3, potassium, magnesium, nitrates, fluorides, arsenic, and hardness. The bacteriological parameters were total coliform, total faecal coliform, and total plate counts. The data revealed that pH, TDS, fluoride, chloride, HCO3, sodium, and hardness were above the limits in Karachi. MCB Market, Goth Ibrahim, and Malir Town were the main contaminated areas in Karachi. In Lahore, arsenic was found above the limits in all sampling locations. Turbidity, pH, HCO3, calcium, magnesium, and hardness were found above the limits in Peshawar. In Gilgit city, all physicochemical parameters were found within the limits except turbidity, which was 10 NTU in Nomal valley. Nitrates were higher in the water sources in Abbottabad. Bacterial contamination was found in the water of all five cities. Most of the studies revealed that this contamination could be human-induced. The improper disposal of solid waste, sewage, and animal waste and the excessive use of fertilisers deteriorate the quality of the water. Precipitation, a rise in temperature, and seasonal variation are climate variables that affect water quality and are responsible for major outbreaks of waterborne diseases. There is an urgent need for regular analysis, proper management, and proper treatment of drinking water before it is supplied to the local community in these cities.

Hydrochemical Characteristics, Water Quality, and Evolution of Groundwater in Northeast China

Groundwater is vital to local human life and agricultural irrigation, and the quality of the water is critical to human health. As a result, it is critical to investigate the hydrochemical evolution and water quality of groundwater in the Sanjiang Plain. There were 259 samples obtained. Furthermore, hydrogeochemical simulation was performed to highlight groundwater’s hydrochemical features, evolution process, and water quality. The analytical results show that the groundwater in the study area is somewhat alkaline with a mean TDS of 285.94 mgL−1 and the primary contributing ions being Ca2+ and HCO3−. The closer the concentration of TDS and NO3− is to the city, the higher the concentration, indicating that the chemical composition of the water body has been affected by certain human activities. The Piper diagram, Gibbs diagram, and correlation analysis results demonstrate that the chemical type of groundwater is mostly HCO3-Ca and the hydrochemistry is primarily regulated by weathering and carbonate and silicate dissolution. According to the entropy-weighted water quality index, the groundwater quality in this location is pretty acceptable. This study could help strengthen groundwater quality monitoring based on local conditions, identify the source of nitrate, provide data support for the safe use of local water resources, and serve as a reference for global water chemical evolution and water quality evaluation in cold regions.

Water Chemical Characteristics and Water Quality Evaluation of the River under the Ecological Water Replenishment: A Case Study in the Yongding River Basin in North China

Water Chemical Characteristics and Water Quality Evaluation of the River under the Ecological Water Replenishment: A Case Study in the Yongding River Basin in North China

Human Impact in the Watershed of the Atoyac River in the Metropolitan Area of Puebla, Mexico

The largest economic, population, administrative, and service production of the State of Puebla (east-central Mexico) is concentrated in the Metropolitan Area of Puebla (MAP), and its effect on the water quality of the Atoyac River is substantial. The anthropogenic contamination of the Atoyac River and its tributaries in the MAP was evaluated and characterized. For this purpose, industry types and industrial density (ID) were identified, and the physical–chemical quality of water in the urban Atoyac, Rabanillo, Zapatero Rivers, and the Covadonga and Echeverría Dams were analyzed. In addition, the cytotoxicity of water was evaluated using the biomodel Allium cepa by analyzing the mitotic index (MI) and the interphase index (II). The correlation between the physical–chemical variables of water and MI was estimated. The results included 4500 industries, among which are the construction, metallurgy, metalworking, food, and textile industries. The highest ID was found in the municipality of San Pedro Cholula. The greatest anthropogenic impact occurred in the Rabanillo River and the Echeverría Dam. Throughout the watershed, anoxic conditions were registered and 18 chemicals, most of which are toxic and carcinogenic, were detected. A Correlation analysis showed that the greatest antimitotic effect in Allium cepa was induced by turbidity, chemical oxygen demand (COD), and lead (Pb), with correlation coefficients of −0.919, p = 0.008; −0.864, p = 0.013; and −0.692; p = 0.030, respectively. It was concluded that if the population, industry, and natural resources are associated in the MAP under current conditions, the outlook, if nothing changes, is that the degradation of the water resource will be disruptive and probably unsustainable for any type of use.

Evaluation of irrigation water quality for paddy cultivation in Bachok, Kelantan

Evaluation of irrigation water quality status was conducted in Bachok district, Kemubu Agriculture Development Authority (KADA) from July 2021 to March 2022. Water quality changes in the irrigation canal were examined by measuring several physical and chemical water quality at eight sampling points. The sampling locations are primary irrigation canals used to supply water into the paddy fields. Water quality parameter measured were temperature, pH, Dissolved Oxygen (DO), Conductivity, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Ammoniacal Nitrogen (AN), Ca, Na and Mg. This paper aims to discuss irrigation water quality status using Water Quality Index (WQI), National Water Quality Standards (NWQS) and Sodium Adsorption Ratio (SAR). The results revealed that water quality were within NWQS Class II-IV except DO, AN and TSS in locations with intensive aquaculture. The average Water Quality Index in all sampling points ranged from 66.67-88.18, indicating that all irrigation water samples falls into the category of excellent and adequate water. The SAR values varied from 1.66-10.20, which means that all irrigation water samples were categorized into suitable for irrigation purposes. This work will help the decision makers to better manage irrigation water resources and policy development for paddy cultivation in KADA.

Physical and Chemical Variables of Freshwater Swamp Ponds of Engenni, Ahoada-West, Niger Delta, Nigeria

The Physical and chemical quality of natural water is essential for the life of aquatic organisms. This study was aimed at investigating the physical and chemical parameters of eight (8) local swamp ponds in the freshwater swamp of Engenni. Physical and chemical parameters of the freshwater swamp ponds were monitored over a period of three months (February-April 2019), During this period, Temperature (℃), Dissolved Oxygen (DO, mg/l), pH, Electrical Conductivity (EC:µs/cm), Total dissolved solids (TDS, mg/l), Salinity (‰), Turbidity (NTU) and Biochemical oxygen demand (BOD) were measured in situ. Temperature values did not vary significantly across stations. DO values ranged between 0.55 ± 0.01mg/l and 0.95 ± 0.02mg/l, which was consistently lower than the 5mg/l prescribed to sustain fish health. pH values ranged from 6.17 ± 0.01 to 6.56 ± 0.01, indicating that the ponds were marginally acidic. Range values for EC (46.60 ± 0.10µs/cm to 156.57 ± 0.06µs/cm) and TDS (30.13 ± 0.12mg/l to 104.07mg/l ± 0.12mg/l) followed the same pattern as they were both highest and lowest in stations V and VII respectively. Salinity values of 0.02 ± 0.01‰ to 0.06 ± 0.0‰ across all stations was indicative of a typical freshwater environment. Turbidity was highest at station VIII. The result obtained from this research suggests that these swamp ponds are capable of sustaining life in the aquatic ecosystem, but only fish species that are low oxygen tolerant may survive in them.

Feasibility and Environmental Impact of NOM Reduction by Microfiltration at a Finnish Surface Water Treatment Plant

Low-pressure membranes (including microfiltration and ultrafiltration) for natural organic matter removal in drinking water treatment have gained increasing interest in the Nordic countries. Microfiltration can produce stable water quality and requires less space than conventional treatment. Hollow fibre microfiltration coupled with chemical coagulation was tested at a Finnish surface water treatment plant to study its feasibility and environmental impact compared to clarification, rapid sand filtration and ozonation. Microfiltration improved both physical and chemical water quality, while natural organic matter removal was similar to that of conventional treatment. Membrane treatment would increase operational costs by 2.5–3.5 euro cents per m3. Most of the costs derive from chemicals used in membrane cleaning. Membrane treatment is an energy-intensive process, but energy production in the Nordic countries has a low emission factor. Greenhouse gas emissions from operating microfiltration are estimated at 16 g CO2-eq./m3 of permeate. Lowering chemical consumption and using renewable energy in production could decrease total emissions.

A Facile Dual‐Emission Ratiometric Carbon‐Dot Fluorescent Probe and Its Application in Portable Chemical Sensors and Water Quality Analysis

AbstractBased on the dual signal of double‐emitting carbon quantum dots (G‐CDs), a ratiometric fluorescence sensor is established to realize the analysis and detection of Fe3+in real samples. When the excitation wavelength is 360 nm and 480 nm, the double emission fluorescence peaks are located at the wavelengths of 477 nm and 523 nm. The former is the fluorescence response signal, and the latter is the fluorescence background signal. The semi‐quantitative analysis of Fe3+was achieved based on the linear relationship between the ratio F477/F523of the two signals and the Fe3+concentration. The linear range of this method is 0.015–120 μM, and the limit of detection (LOD, S/N=3) is 5 nM. Meanwhile, the naked‐eye visual detection of Fe3+can be realized according to the fluorescence color of the probe. The probe exhibits excellent anti‐interference, selectivity and repeatability, and this method can be applied to the detection of Fe3+in actual samples.

Quality of riparian habitat and its influence on water quality in some ecosystems of waterfalls and springs in Bawean Island

This study aims to evaluate the quality of riparian habitats based on the index of riparian quality (QBR), quality of riparian tree vegetation (community structure and Naturalness index), and anthropogenic activity (Hemeroby Index) and their relationship to water quality in some waterfall and spring ecosystems on Bawean Island. This Ex Post Facto study was conducted on six waterfall ecosystems (Candi, Putri, Suwari, Talomon, Laccar and Kuduk Kuduk) and two spring water ecosystems (Kuduk Kuduk and Laccar). Analysis of riparian tree vegetation at each location was observed from three plots with size 50 x 50 m2. The physics chemical quality of water observed at each location included pH, dissolved oxygen/DO, total suspended solid/TSS, total Kjeldahl nitrogen/TKN, and biochemical oxygen demand/BOD. The results showed that the quality of the riparian habitat affected the water quality.

Spatial Modeling of Groundwater Quality Parameters on Mosul's Left Bank

Spatial distribution of groundwater quality is one of the issues that are urgently requested from both the people and decision-makers, especially during the deficiency of water network supply. This work included creating spatial groundwater quality maps on Mosul's left bank. The water quality studied parameters were pH, EC, TDS, Ca2+, Mg2+, K+, Na+, SO42-, HCO3-, NO3-, Cl- and other chemical water quality parameters as well as heterotrophic bacteria. A statistical investigation has been done to evaluate the relationship between these parameters. An inverse distance weighted interpolation model was used to give these parameters a better geographical distribution pattern. The visual groundwater quality models gave an overview of this water source's environmental reality and possible pollution points. The results of this work could be employed as an effective tool in the field of planning and environmental protection of water resources in Mosul City because there is polluted groundwater on the eastern side of Mosul which is polluted by septic tanks and the sewage system

Chemical Hydrological Features and Water Quality Evaluation of Phewa Lake of Pokhara Valley Gandaki Province of Nepal

This study was conducted to investigate the hydrochemical characteristics and water quality of Phewa lake Pokhara. Water samples were collected and major hydrochemical features were analyzed viz., Transparency, pH, electrical conductivity (EC), total dissolved solids (TDS), total alkalinity (TA), total hardness(TH), dissolved oxygen (DO), microbial analysis (MA), nitrate (NO3¯), phosphate (PO43¯), ammonia(NH3), sulfate (SO42¯), chloride(Cl¯), iron(Fe2+/Fe3+), phosphorus (P) and dissolved solids (DS). The obtained values of the hydrochemical characteristic of lake water have been compared with the world health organization (WHO). The presence of phosphate concentration and the hardness in Phewa lake is higher than the WHO value indicating the problem of rapid eutrophication. This indicates that Phewa lake water has more magnesium and calcium soluble salt. Thus, the rapid eutrophication and higher concentration of organic matter could be a serious problem for lake sustainability. Various types of natural and anthropogenic activities like agricultural runoff, urbanization, discharge of domestic sewage, solid waste dump, and industrial effluent are the major problem for lake sustainability.

Kajian Sanitasi Kolam Renang di Tempat Wisata Air Pemancingan 100 di Wunut Kabupaten Klaten Tahun 2022

The swimming pool is one of the public spaces that is frequently visited by the public, so it can be a place for the spread of pathogens and has the potential to cause risks of water-based diseases (water borne diseases), if they have poor sanitation conditions. Based on a survey of sanitary conditions in the Pemancingan 100 swimming pool, it is known that there are no signs prohibiting swimming for people with infectious diseases, toilets are not separated for men and women, trash bins are open and do not have a lid, and and water quality does not meet the applicable quality standards. This study aims to determine the sanitary conditions in the Panancingan 100 swimming pool based on environmental health, building construction, room or room health, sanitation facilities, and swimming pool water quality physically and chemically.This type of research is an observational study in the form of a case study with parameters examined including environmental health conditions, building construction, room or room health, sanitation facilities, and physical and chemical swimming pool water quality. The research instrument used a checklist sheet to determine environmental health conditions, building contruction, room or space hygiene and sanitation facilities, a secchi disk tool to measure clarity, as well as a pH and residual chlorine test kit to measure pH and residual chlorine. The results of the study, it was shown that sanitation in Fishing 100 swimming pools was declared unfit for health with an inspection score of 734. This value was obtained from several variables including, environmental health conditions scored 120 (fit for sound), building construction conditions got a score of 61 (fit for health), the health condition of the room or room gets a score of 30 (unfit for health), the condition of sanitation facilities gets a score of 303 (unfit for health), the physical condition of swimming pool water gets a score of 120 (fit for health), and the condition of the chemical quality of swimming pool water gets a score of 100 (unfit healthy).
 Keywords: Sanitation, Swimming Pool, Quality Standards

Interrogation on Optical Properties of Electrolyte Minerals, TSS and Turbidity in Water - Spectrophotometer and IOP Profiler Based Hyperspectral Analysis Approach

The optical properties of total suspended solids, turbidity, and electrolyte minerals in water such as sodium, potassium, and calcium were studied under laboratory and field-oriented conditions. Spectrophotometer and Wet Lab Instrument Inherent Optical Properties profiler have been used to measure the optical properties. The polynomial fit between the field measured absorption spectra and laboratory measured absorption spectra of each mineral explains in detail the chemical water quality parameters and optical properties. The spectrophotometrically derived absorption coefficient of electrolyte minerals such as sodium (1,000 ppm), potassium (100 ppm), and calcium (1,000 ppm), TSS (500 ppm) and Turbidity (100 NTU) makes virtuous correlation with the IOP profiler measured absorption coefficient donates the best polynomial fit R2 values of 0.9076, 0.9019, 0.9645, 0.9823 and 0.9354 respectively. Results in this study exhibits that, the absorption coefficient of electrolyte minerals, TSS, and Turbidity in water increases with increasing their concentrations at the wavelengths range from 200 to 300 nm. HIGHLIGHTS The absorption coefficient values are increasing with the increasing concentration of sodium as well as for calcium and Total suspended solids The absorption spectra of potassium are exponentially increasing with decreasing wavelength The absorption curves show an evolution from a solitary, well defined absorption trough at 550 nm at lower turbidity values to a broader, more flat-topped absorption encompassing from 550 to 650 nm at higher turbidity levels GRAPHICAL ABSTRACT

Physico - Chemical and Biological Water Quality Analyses of Meenachil River, Kottayam, Kerala, South India

The Meenachil River is one of the major rivers that flows through the Kottayam District of Kerala, India. The water quality of the Meenachil River was studied. Five locations of the river were chosen. pH, Turbidity, Conductivity, Hardness, Calcium & Magnesium hardness, TDS, Calcium, Magnesium, Iron, Sulphate, Chloride, Fluoride, Nitrite, Nitrate, and DO were measured. From the study, it was observed that diverse human activities have an impact on the water quality of the Meenachil River. The present study showed that the pH of the water samples rose at several places, with sample 2 taken from Erattupetta having the lowest pH, indicating that the water sample 2 is acidic in nature. Due to the discharge of industrial and household wastewater, station 5 Kottayam has the highest conductivity, hardness, alkalinity, chloride, fluoride, nitrite, nitrate, TDS, and coliform count. Dissolved oxygen was extremely low in Kottayam region.

Spatiotemporal analysis of water quality indicators in a watershed in Brazilian Cerrado

Abstract Tools for monitoring and evaluating water quality are necessary for the measurement of environmental impacts arising from diverse activities in hydrographic basins. Here, the water quality of the Verdinho River, an important hydrographic basin of Brazilian Cerrado, was evaluated using 16 physical–chemical parameters. The indicators with major interference with water quality were identified by principal component analysis (PCA), in order to suggest less laborious and less expensive assessments. The water quality index (WQI) was applied considering seasonal changes and the analysis of eutrophication potential was determined using the trophic state index (TSI). The concentrations of chemical water quality indicators (e.g., nitrate, total phosphorus, total nitrogen) increased mainly in the rainy season. The PCA explained 73.69% of the variance among the data. Total solids, temperature, turbidity, alkalinity, biochemical oxygen demand, hardness, total phosphorus, nitrite, nitrate and ammonia showed strong correlations. The water quality was classified in the ‘good’ category in most of the evaluations. The TSI presented conditions between mesotrophic and eutrophic. The indicators that are analyzed seasonally and spatially are associated with natural and anthropic factors. The future implementation of a water catchment project water depends on environmental planning strategies to reduce the impacts on the water quality of this hydrographic basin.

Removal of Iron from Groundwater by Ash

Iron extraction generates waste that can impact the chemical quality of water. The aim of this work is to test the effectiveness of potash from different ashes obtained from several plants to remove ferrous ions from groundwater in the canton of Bangeli. Thus, three ashes were obtained respectively from corn cobs, nere wood and soybean stalks. The dry matter taken from porcelain crucibles was calcined at 550°C in an oven for 6 hours. The results showed that ash from corn cobs has a more ferrous ion removal effect. Indeed from a concentration of 2.5 g / L of this ash is obtained a reduction of 95% of the concentration of ferrous ions of treated water after 6 hours of reaction. There is also an increase in the levels of certain minerals such as potassium and sodium in water treated with ash from corn cobs.

Assessment of Effect of Industrial Effluent on Ground Water of Pali, Rajasthan, India

A study was conducted to assess the present status of the ground water in Pali town. The city is known as an industrial hub especially for the textile industry. Ten sampling locations were selected at random and the ground water samples were selected from tube wells and wells in and around Pali town. For this purpose, these samples were analysed for major physical and chemical water quality parameters such as pH, electrical conductivity (EC), total dissolved solids (TDS), Alkalinity, Total Hardness (TH), Sodium, Phosphate, Nitrate, Carbonate, Bicarbonate and Chloride. The results were compared with standards prescribed by WHO (World Health Organization). It was found that most of the samples of the ground water quality were substandard, may be due to the industrial effluents, discharge by industrial units in the Bandi River and on open surface. The sampling sites Punayata and Mandia showed high deviation from standards prescribed by WHO. Hence the present study concluded that the ground water quality in the study area was polluted. So, it is necessary to take periodic monitoring of the ground water quality and strict rules and regulation on industrial effluent in this region for future sustainability.