Underground Water Samples Research Articles

Sorption of Cd(II) and Pb(II) ions by Nanolimestone from underground water samples from Tehama region of Saudi Arabia

Powdered Nano limestone (NLS) has been investigated as an un-expensive adsorbent for heavy toxic metals removal from aqueous solutions as cadmium and lead. Batch experiments were carried out, The favorable pH for maximum metals adsorption was at 6.8 for both. The surface area increased in case of NLS up to 6.2 m2/g. The adsorption capacity calculated by Langmuir equation was 75.1 mg/g for Cd(II) and 68.4 for Pb(II) ions at pH 6.8. The adsorption capacity increased with temperature and the kinetics followed a First-order rate equation for both. The enthalpy change (ΔH0) was 25.4 Jmol−1 for Cd(II) and 20.8 Jmol−1 for Pb(II), while entropy change (ΔS0) was 41.6 JK-1mol-1 for Cd(II) and 38.7 JK-1mol-1 Pb(II), which indicate that adsorption process was endothermic and spontaneous in nature. About 25 collected samples of groundwater were tested and found to be contaminated with cadmium and lead elements with different rates, with using NLS as adsorbent able to remove both metals from the samples. All of the results suggested that the NLS is excellent nano-adsorbents for cadmium and lead contaminated water samples.

A review on determination of 90Sr from alkaline waters using precipitation of Ca(OH)2 and Ba(Ra)SO4

Since the Chernobyl accident (1989) and the Fukushima Daiichi Nuclear Power Plant accident in 2011, concern about the contamination of 90Sr in the environment has increased considerably. It is important for public safety to monitor 90Sr in aquatic environments due to the radiotoxic of its biochemical similarities with calcium in living organisms. Several techniques for the separation of strontium from matrices have been reported such as solvent extraction, liquid membrane extraction, ion-exchange, and extraction chromatography using Sr-Resin. This review provided a summary on literature works to develop efficiency radiochemical separation for removing 90Sr from waters. Radiometric method normally requires a long time and complete separation of Sr from the matrix and other radionuclides. One of simple method based on Ca(OH)2 precipitation in alkaline solution and purification of Yttrium using Ba(Ra)SO4 precipitate was applied to the separation of Sr from seawater and underground water sample. This review is a mini-report for determination of 90Sr removal from contaminated waters.

Influência da proximidade de um aterro sanitário na qualidade das águas

Diversos fatores contribuem para contaminação das águas tanto superficiais como subterrâneas localizadas próximas a um aterro sanitário. Isto deve-se provavelmente ao fato da formação de compostos decorrentes da decomposição da matéria orgânica do material que é depositado no aterro sanitário. Em consequência, a qualidade dessas águas são alteradas e não podem mais ser utilizadas para os diversos fins pela população. O estudo foi realizado em águas de rio e poço localizadas próximo a um aterro sanitário situado em um munícipio dentro da área metropolitana de Fortaleza, capital do estado do Ceará. Foram coletadas três amostras de água de rio e uma amostra de água subterrânea durante três meses e foram realizadas as análises dos parâmetros indicadores de qualidade estabelecidos pelas Resolução nº 357, de 17 de março de 2005 e Resolução nº 396, de 07 de abril de 2008, do Conselho Nacional do Meio Ambiente (Conama). As análises seguiram as metodologias descritas no Standard Methods for the Examinations of Water and Wastewater (APHA, 2012) e foram realizadas no Laboratório de Química Ambiental da Fundação Núcleo de Tecnologia Industrial do Ceará (NUTEC). De acordo com os resultados obtidos as concentrações de alguns parâmetros se encontraram em desacordo com os valores máximos estabelecidos pelas legislações citadas, sinalizando uma preocupação de risco para a saúde da população do local.

Investigation on risk of phthalate ester in drinking water and marketed foods

The concentration of dibutyl phthalate and dioctyl phthalate in Taiwan's drinking water and several marketed foods were analyzed. The samples examined included 5 water sources, 3 vegetables, 4 fish and 3 meat products. While, the residue of dibutyl phthalate was found only in underground water samples, the residue of dioctyl phthalate was found in most tested food samples. The dioctyl phthalate content of fish samples was higher than that of vegetables followed by meat products. The results show that samples of Taiwan drinking water and food are contaminated with dioctyl phthalate and/or dibutyl phthalate. The contamination pathway may result from the disposal of the materials containing dibutyl phthalate and/or dioctyl phthalate leaching into soil and ground water and may reflect a potentially larger scale of environmental contamination.

Analysis of emerging contaminants: A case study of the underground and drinking water samples in Chandigarh, India

The present report deals with the analysis of emerging contaminants and the quality of drinking and underground water supply in Chandigarh, India. A water sampling monitoring and analysis was conducted by collecting a total of 54 samples of underground & drinking water of Chandigarh to analyse the health risk associated with the spread of emerging contaminants in the water sources. The quality of water samples was also assessed by measuring the colour, odour, temperature, pH, electrical conductivity (EC), biological oxygen demand (BOD), dissolved oxygen (DO), total dissolved solids/ salts (TDS) and hardness. For the estimation of the emerging contaminants (Endosulphan (ES) and Hexachlorohexane (HCH)) in the water samples, an extraction procedure was carried out by dispersive liquid-liquid extraction method followed by analysis using gas chromatography-mass spectrometry (GC-MS). The levels of ES and HCH obtained were compared with the drinking water standards of the Bureau of Indian Standards (IS: 10500). The levels of HCH and ES in all the water samples tested were found to be below the detection limit. It cannot be denied that the industrial discharge and other agencies seems to be complying with the regulations. The Initiatives by the Central and State Govt of India seems to have created sensitivity and awareness among the public specifically among the farmers. The limit of detection (LOD) were 1.0 × 10−3 and 2.4 × 10−3 ppm for ES and, HCH respectively. However, some water pollution indicators such as TDS, EC, DO and total hardness were found to exceed the limits specified by the Bureau of Indian Standards (BIS).

Environmental Survey of Rotavirus in Sewage Water within Maiduguri Metropolis, Nigeria

Background and study aim: Inadequately treated water supply and unhygienic food consumption are the major sources of contracting feco-orally transmitted viral pathogens, including Rotavirus. This prospective study aimed to assess the presence of Rotavirus in sewage, underground and surface waters collected from different locations within Maiduguri Metropolis, Nigeria. Materials and Methods: A total of 170 sewage and water samples (underground and surface waters) were collected from various sources in high-density and low-density areas of the Maiduguri metropolis. A modified adsorption- elution method for concentration of enteric viruses in sewage and water samples and detection of the presence of rotavirus (if present) was done using Enzyme linked immune-sorbent assay (ELISA). The viruses in water were concentrated by negatively charged membrane filtration, eluted with 0.05M Glycine at pH 11.5, and re-concentrated by centrifugation at 12,000rpm for one hour. Results: Out of the 60 domestic sewage samples collected from high-density areas, 8.3% were positive for rotavirus antigen, whereas none of the samples from low-density areas were positive. In addition, rotavirus antigen was not detected in underground and surface water samples. The temperature range of the 5 rotavirus positive samples was 23-30oC. All the 5 positive samples had alkaline pH that ranged between 8 and 9. Conclusion: This study has demonstrated the persistence of rotavirus in sewage and its possible transmission through contaminated food and poor treated water

Discriminatory analysis of spring water supply direction

In this paper,56 groups of underground water samples were collected in Baotu Spring Catchment, and a discriminant model was established to judge the recharge direction and aquifer of the four major spring groups. The results showed that Baotu Spring Group and Black Tiger Spring Group mainly recharge from southwest direction Ordovician karst water, Central south direction of Ordovician karst water respectively, and Five Dragon Pool Spring Group and Pearl Spring Group received from southwest direction and southeast direction Cambrian karst water supplement respectively. The research results are of great significance to the implementation of Jinan spring conservation and precise source replenishment measures. At the same time, it shows that the karst water system in northern China has the characteristics of uneven karst development.

Assessment of groundwater quality in inland blocks of Tirunelveli District of Tamil Nadu

Block wise categorization of groundwater quality in Inland region of Tirunelveli district for its optimal usage to minimize the soil salinity was undertaken during November 2019. A total of 87 underground water samples representing different Inland blocks viz., Palayamkottai (5), Cheranmahadevi (5), Kalakkadu (6), Ambasamudram (8), Tenkasi (5), Shencottai (5), Kadayanallur (5), Vasudevanallur (7), Sankarankoil (6), Keezhapavur (5), Kadayam (4), Pappakudi (4), Alangulam (5), Melaneelithanallur (5), Kuruvikulam (6) and Manur (6) were collected, analyzed for quality parameter and categorized into different water quality as per the standard procedure. The investigation revealed that groundwater samples with respect to pH and EC ranged from 6.50 to 8.10 and 0.77 to 6.91 dS m-1, respectively. Residual Sodium Carbonate (RSC) varied from nil to 9.40 meq L-1 and Sodium Adsorption Ratio (SAR) ranged from 0.34 to 9.46. Frequency of occurrence of good quality water in the blocks surveyed were in the order of Kalakkadu and Pappakudi (100%)> Ambasamudram (87.5%)> Cheranmahadevi (80%)> Alangulam (80%)> Sankarankoil (66.6%)> Tenkasi (60%)> Shencottai (60%)> Kadayanallur (60%)> Melaneelithanallur (60%)> Kadayam (50%)> Manur (49.98%)> Vasudevanallur (42.84%)> Kuruvikulam (33.32%) based on the CSSRI, Karnal water quality classification in Inland blocks of Tirunelveli district, 20 per cent of groundwater samples were in good quality, Saline water was found in Palayamkottai. Alkali water was found in Tenkasi, Manur, Kadayam, Kuruvikulam and Ambasamudram blocks to the extent of 20, 16.6, 25, 16.6 and 12.5 per cent respectively. Among the Inland blocks of Tirunelveli districts surveyed, Keezhapavur block falls under high Alkali (40%) and lowest good quality of groundwater (20%).

Statistical evaluation of fluoride contamination in groundwater resources of Santiago del Estero Province, Argentina

This study investigates the suitability of statistical techniques for evaluating the fluoride content and the groundwater quality from Robles Department (RD) and Banda Department (BD) in Santiago del Estero (Argentina). For the original statistical study, evaluation of nine parameters (fluoride, pH, conductivity, atmospheric and water temperature, total dissolved solids, chloride, hardness, and alkalinity) of 110 collected underground water samples from 23 dispersed rural areas was proposed. Groundwater samples were obtained by sampling taken from wells at different depths. Fluoride levels were determined by a standard colorimetric method in two seasonal periods, the dry (from April to September) and rainy (from October to March) period. The analytical results obtained for physicochemical parameters such as pH, total dissolved solids (TDS), and temperature does not reveal any notable difference between the rainy and dry seasons studied. In both seasons, the atmospheric temperature average was 22 ​°C. With respect to fluoride content, approximately 50% of the analysed groundwater samples exceeded the limit established by current legislation (1.0 ​mg/L), obtaining concentration levels in the range of 0.01–2.80 ​mg/L. This study demonstrates the usefulness of the univariate statistical method (quartiles calculation, interquartile range IQR), multivariate principal component analysis (PCA), and cluster analysis to establish a better understanding of the state of the contamination of the waters in the region studied.

Evaluation of quality of underground irrigation water of Nagaur District with salinity, Sodicity and alkalinity contamination

In this study, some important chemical parameters of underground water of the area were evaluated for the criteria of irrigation water quality. Higher values of pH, EC, SAR and RSC make the underground water unfit for irrigation purposes. One hundred fifty underground irrigation water samples were collected from various tehsils of Nagaur district during 2018-19. Based on salinity the classes of irrigation water were recorded normal water (0.66%), Low salinity water (39.34%), Medium salinity water (60%) and based on sodicity the classes of irrigation water were recorded normal water (2%), Low sodicity water (74.66%), medium sodicity water (23.34%) and based on alkalinity the classes of irrigation water were recorded non alkaline water (30%), Normal water (2%), Low alkalinity water (44.66%), medium alkalinity water (16%), high alkalinity water (7.34%). Majority of the water samples are fall under low to medium suitable category of water for irrigation purposes.

Trapping and preconcentration of volatile organic sulfur compounds in water samples by portable and battery-powered trapping device prior to gas chromatography-sulfur chemiluminescence determination

A simple, portable and battery-powered trapping device (iTrap) consisting of a purification tube, a trapping unit and a miniature air pump was developed for the pre-concentration of volatile organic sulfur compounds (VOSCs). The tested VOSCs, including methanthiol (MT), ethanethiol (ET), dimethyl sulfide (DMS), diethyl sulfide (DES) and dimethyl disulfide (DMDS), were firstly purged from water samples and then in situ pre-concentrated with the iTrap prior to their analysis by thermal desorption gas chromatography coupling with a sulfur chemiluminescence detector (TD-GC-SCD). Twenty-six adsorbents were studied to find the most suitable adsorbent for the efficient pre-concentration of VOSCs. Under optimal conditions, limits of detection of 6, 8, 6, 2 and 3 ng L−1 were obtained for MT, ET, DMS, DES and DMDS, respectively. The precisions were better than 5.3% (relative standard deviations, RSDs). The iTrap was successfully applied for the analysis of VOSCs in Certified Reference Materials, several surface water, underground water and wastewater samples collected from Pengzhou city, Sichuan, China. Moreover, the VOSCs trapped in the iTrap were much more stable than those directly stored in water samples and the recoveries for all samples could be maintained at acceptable levels (>73%), even their preservation time as long as 8 h.

Oxidized carbon nanotubes as sorbent for miniaturized solid-phase extraction of progestins from environmental water samples prior to their determination by HPLC-UV.

A solid-phase extraction method is presented for micro-extraction of three progestins (levonorgestrel, 19-norethisterone acetate and medroxyprogesterone acetate) from water samples. A mini-column was packed with 60mg of oxidized multiwalled carbon nanotubes and coupled to a flow injection assembly. The extraction parameters, such as washing solution, eluent type, eluent volume, flow rate and sample volume, were optimized. Separation and determination were performed by HPLC with UV detection. The method has a good linear range (0.90-9.0μgL-1), acceptable limits of detection (0.05-0.14μgL-1) and low RSDs (0.8-4.6%). Attractive features of the method include low consumption of organic solvents and preconcentration factors of up to 100. The method was applied to analyze stream, underground and effluent water samples, and recoveries between 74 and 121% were obtained. Graphical abstractSchematic representation of the flow injection assembly couples to an ox-MWCNTs extraction column used to perform the solid phase extraction procedure of progestins in environmental water samples.

A zinc mixed-ligand microporous metal-organic framework as solid-phase microextraction coating for priority polycyclic aromatic hydrocarbons from water samples

For the first time, a novel triple catenated Zn2+-pillared metal-organic framework (PUM 210) is proposed as solid-phase microextraction coating for the extraction of 16 priority pollutant polycyclic aromatic hydrocarbons (PAHs) from water samples and their subsequent quantitation via gas chromatography-mass spectrometry. Extraction was optimized by using a central composite face centered design followed by the multicriteria method of the desirability functions. The best conditions for the extraction of the sixteen analytes were found in correspondence to an extraction temperature of 30 °C and an extraction time of 30 min.Method validation allowed to obtain quantitation limits in the 1–7 ng/L range, a repeatability within 16% relative standard deviation (RSD), an intermediate precision within 22% RSD at limits of quantitation, and recovery rates in the 85 (±5) – 117 (±21)% range. As for selectivity, PAHs extraction proved to be feasible also in the presence of high concentration levels of potentially competing compounds like benzene, toluene, ethylbenzene and xylenes with steric hindrance playing a key role in analyte inclusion. Enrichment factors in the 300 (±5) – 14-950 (±150) range were obtained, being the heaviest compounds better extracted with respect to commercial coatings. Finally, the method was applied for the quantitation of PAHs in sixty-nine underground water samples during a monitoring campaign carried out in 2018.

Implications of Improper Sewage Management on Public Health: A Case Study of Kosofe Local Government Area, Lagos State

Sewage management and its implications on public health remain one of the major challenges of urbanisation faced by developing countries such as Nigeria. As a member of the United Nations (UN), Nigeria is actively involved in ensuring achievement of the Sustainable Development Goals (SDGs), especially those that have direct impact on human health and liveability of dwellings in urban and periurban settlements. The sanitary state of an area is largely influenced by the waste handling practices of residents and involves measures for safe waste evacuation and disposal. This study examined sewage management in the low-income settlement of Agboyi-Ketu, Lagos State. In the sampling area, 21 streets were selected using a stratified sampling technique while 105 buildings were chosen via systematic sampling, after which copies of an interview-administered questionnaire were distributed to respondents. It was found that most of the buildings erected close to the nearby water body did not have septic tanks but had either a pit toilet or a non-functional water closet. Some residents openly defecated into the nearby stream and a number of households with septic tanks disposed their sewage in the stream through sewer pipes, thereby polluting the water. Microbiological analyses were carried out on water samples collected from the area (ground water and surface water) to ascertain their level of potability. It was observed that the underground water and surface water samples were highly contaminated with enteric microorganisms such as E.coli, Klebsiella spp, Pseudomonas spp and Saccharomyces spp, thus making such water unfit for drinking. The study therefore suggests that more efforts should be made to ensure proper sewage disposal in the area to reduce the negative environmental health impacts for which the majority of residents are responsible. If the situation is addressed, then SDG 3 will be attained, i.e., to ensure healthy lives and promote well-being for all at all ages. There will be a reduction in the spread of infectious and communicable waterborne diseases such as tuberculosis, malaria, cholera, hepatitis A, leptospirosis, and typhoid fever. It is also expected that by 2030, SDG 11—making cities inclusive, safe, resilient and sustainable—will be achieved, thereby reducing the adverse per capita environmental impact of cities by paying special attention to municipal and other forms of waste management in cities such as Lagos.

Natural Radioisotopes Determination in Groundwater and Tap Water using Gamma Spectrometry

Samples of underground drinking water -tap water, water from drilled wells and springs- have been collected from selected sites in Ikaria island. Concentration levels of 226Ra, 228Ra and 222Rn have been analysed by gamma spectrometry. The effective dose equivalents from ingestion of water are in the range 0.1-114μSv.y-1 for 222Rn and 25-175 μSν-1 for 226Ra. The respective range from inhalation of 2 2 2Kn released from water is 0.36-85 μSν.y-1.

MULTIVARIATE ANALYSIS APPLIED AT THE SCHOOL OF THE UBERLAND-AMERICAN FIELD OF CONSUMER UNDERGROUND WATER QUALITY

The decrease of the water available for human consumption is directly related to the unregulated and unconscious action from the man himself. In rural areas, this depreciation is related to inappropriate conditions of artesian wells that capture the water (old wells and poorly sealed) and which are usually close to sources of pollution, such as septic tanks and animal grazing. In this context, the objective of the present work was to evaluate the physico-chemical and microbiological quality of underground water samples made available for consumption in three schools in the field next to the municipality of Uberlândia-MG. Methodologically, the data were statistically processed by means of descriptive and multivariate analysis (Pearson correlation coefficient). All schools are supplied by an artesian well, being carried out simplified treatment (chlorination mechanism of chemical treatment). In only one of the schools was identified the presence of a septic tank sewage collection system. Of samples evaluated, all were at odds with the standards laid down in annex XX of the Consolidation Ordinance No. 5 of the Ministry of health (old law 2,914/2011) in at least one of the parameters evaluated. Therefore, the results reflect the possibility of biological contamination of the water by grazing areas located in the region close to the wells, as well as the need for emerging measures, such as regular cleaning and maintenance of storage systems and distribution of the water consumed in the institutions.

Occurrence and risk assessment of phenolic endocrine disrupting chemicals in shallow groundwater resource from selected Nigerian rural settlements

Abstract To date, limited information exists on the distribution of endocrine disrupting compounds in groundwater resources from African rural settlements. In view of this knowledge gap, the present study investigated the concentrations and potential health risks of phenolic endocrine disrupting chemicals (EDCs) in underground water samples obtained from eight rural settlements in Nigeria, West Africa. The water samples were obtained from domestic drinkable communal wells at Anambra (Mgbaukwu and Umudioka), Lagos (Bariga, Itire and Mushin), and Delta (Agbarho, Ikweghwu and Orhokpokpor) states representing the South-East, South-West and South-South Nigeria respectively. Samples were analyzed for 10 selected chlorinated, nitrogen-containing and alkyl phenolic compounds using gas chromatography coupled with flame ionization detector technique. At all understudied sites, selected phenolic compounds with the exception of 2-chlorophenol which was below detectable limits at 4 sites (Agbarho, Mgbaukwu, Umudioka site 1 and Mushin) were detected. The concentrations of the phenolic compounds in the samples from the different sites ranged between below detectable limits to 0.0904 ppm. Nonylphenol, 2,4-dinitrophenol and 2,4,6-trichlorophenol were predominant at EDCs in most sites when compared with the other phenolic contaminants. The calculated chronic daily intake (CDI) results for the exposed populations at the communities implies that the level of occurrence and daily intake of 2-nitrophenol, 2,4-dimethylphenol, 4-nitrophenol, 2-chlorophenol and bisphenol A were still below their respective oral reference doses. Nonylphenol and 2,4,6-trichlorophenol (risk quotient, RQ > 1) were identified as the major EDC contributors to potential health risk for exposed populations at the communities.

Concentration, Source, and Total Health Risks of Cadmium in Multiple Media in Densely Populated Areas, China.

Cadmium (Cd) is a non-essential and harmful element to humans. Cadmium contamination is a serious issue for human health, especially in densely populated agroecology areas. In this study, the investigation of an agroecology area was conducted to gain insight into the relationship between Cd in wheat and soil and then evaluate the Cd total risk for human health. The soil samples and their matching wheat samples, underground water samples, and atmospheric deposition (air) samples were collected from a wheat-growing area in an agroecology plain. The cadmium concentration in the four types of media, in order, was air > soil > wheat > water. The mean concentration of the geoaccumulation index (Igeo) showed that the total Cd in soil (Cd-T) and Cdair reached a mild and moderate pollution level. The results of the correlation and principal component analysis (PCA) showed that the majority of Cdwheat originated from Cd-2 (exchangeable), Cd-4 (humic acid-bound), and Cd-7 (residual). Furthermore, the results of the stepwise multiple linear regression (SMLR) showed that three fractions were primarily controlled by Cd-T: clay, cation exchange capacity (CeC), and total organic carbon (TOC). In addition, the total cancer risk (CR) of Cd in multiple media was, in the order wheat > water > soil > air. It is noteworthy that the Cd content in underground water and wheat by the ingestion pathway posed cancer risks to the local residents and provided a comprehensive insight into multiple media environment management. Furthermore, it provides a very significant basic study for detailed research into the mobility and transformation for factions.

Cover Feature: Catalytic Chemosensing Assay for Selective Detection of Methyl Parathion Organophosphate Pesticide (Chem. Eur. J. 41/2019)

A bimetallic complex, [RuII(bpy)2(CN)2]2(CuII)2 (bpy=2,2′-bipyridine), integrating a catalyst (CuI-catalyst) and a signaling transducer ([RuII(bpy)2(CN)2]) to simultaneously detect and degrade methyl parathion, is presented. The catalytic chemosensing assay (CCA) constitutes an “AND” logic gate for organophosphate detection in tap, river, and underground water samples. More information can be found in the Full Paper by C.-B. Gong, C.-F. Chow, et al. on page 9643.

Fluid Sampling Monitoring at Yanchang CO2-EOR Demonstration Site, Ordos Basin, China

In this paper, we firstly addressed the status and the overall scheme developed for the CO2-EOR Demonstration Project at the Jingbian site, the Yanchang Oilfield, the Ordos Basin, Shaanxi, China, under the funding support of China-Australia Geological Storage of CO2 (CAGS) Program. Then, we are focusing on the fluid sampling monitoring as one of key monitoring indicators of leakage assessment, and the detailed monitoring plan was tailored for the Jingbian CO2-EOR Block in the Yanchang Oilfield with consideration to the existing situation of monitoring technologies for CO2-EOR activity and project planning in China. All the fluid samples were collected from different locations such as surface water ponds, groundwater wells, and monitoring wells around the CO2 injection site. The specific designed multi-layer U-tube based samplers were installed in the monitoring wells at the Jingbian CO2-EOR site. Three 200 m deep shallow monitoring wells were drilled for the samples of underground water and subsurface soil gases. Using 20 Baseline samples collected in 2016 at the Jingbian, and 22 monitoring samples collected in 2017, we found the tracks of some changes in the fluid chemistry and isotope composition. All the regular anions and cations, e.g. Cl-, SO42-, Mg2+, Ca2+, Na+, K+ and HCO3-, were analysed. In addition, total dissolved solids (TDS), pH, conductivity, salinity, oxidation-reduction potential (ORP), organic components, especially petroleum contaminants such as BTEX and PAHs, and isotopic analysis were also traced throughout the sampling analysis. Some of preliminary results can be addressed as follows: 1. The average salinity of formation water is 71.34 g/L, pH is 5.5, and the water belongs to CaCl2 type at the Jingbian site according to the classification of China’s underground water standard. 2. The monitoring indicators for the subsurface water at the Jingbian site indicate good stratification characteristics, and the concentration level of each monitoring indicator decreases with increasing depth. 3. The application potential of the multi-layer U-tube based fidelity sampling technology was demonstrated for the subsurface environmental monitoring. The results of fluid samples provide some significant information for the coming monitoring activities during the implementation of large-scale CO2-EOR or CO2-EWR projects in the Yanchang Oilfield.