Article
Environmental Sciences
Xing Chen, Chunlu Jiang, Liugen Zheng, Liqun Zhang, Xianjie Fu, Shigui Chen, Yongchun Chen, Jie Hu
Summary: This study is the first attempt to combine hydrochemical, isotope, and multivariate statistical analysis methods to explore the origin, control, and influence of fluoride enrichment in mining cities. The results show that mineral dissolution, cation exchange, and evaporation are the main driving processes for groundwater salinization in the study area, with mine drainage inputs exacerbating the increasing salinity of the groundwater.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Liwen Huang, Ziyong Sun, Aiguo Zhou, Junbo Bi, Yunde Liu
Summary: This study investigated the distribution characteristics and controlling processes of fluoride enrichment in groundwater in arid inland irrigated areas. The results showed that fluoride concentration in groundwater was generally high and positively correlated with salinity. River water was identified as the main source of fluoride in groundwater, and anthropogenic inputs were found to contribute to fluoride enrichment.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Reema Mandal, Anirban Das, A. K. Sudheer, Sanjeev Kumar, Sangeeta Verma, Mahesh Gaddam, R. D. Deshpande
Summary: This study investigated fluoride contamination in groundwaters of a rural region in semi-arid Western India using geochemical and isotopic techniques, along with Health Quotient assessment. It found that high fluoride levels were mainly from water-rock interaction and phosphate fertilizers. Samples with high fluoride content were characterized by high pH, Na, and alkalinity, and low Ca, with calcite precipitation affecting the solubility of fluoride-bearing minerals. Estimated non-carcinogenic risks revealed that hundreds of thousands of adults and children may be at risk of fluorosis.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Geosciences, Multidisciplinary
Fei Liu, Jingkun Zhang, Shiqin Wang, Jiawen Zou, Pinna Zhen
Summary: This study investigates the evolution of groundwater resources in the North China Plain using stable isotopes and chemical data. The findings reveal that lateral inflow and surface water play important roles in groundwater recharge. The hydrochemical evolution of groundwater is predominantly influenced by salinity and alkalinity, and the reduction of groundwater exploitation has significant impacts on the chemistry of unconfined water. However, the confined aquifer shows insignificant changes in salinity due to the groundwater exploitation reduction project.
GEOSCIENCE FRONTIERS
(2023)
Article
Water Resources
Yuheng Yang, Baisha Weng, Denghua Yan, Xiaoyan Gong, Yanyu Dai, Yongzhen Niu, Guoqiang Dong
Summary: The study focused on analyzing the contribution of different water sources to streamflow in the Nagqu River watershed on the Qinghai-Tibet Plateau. The results showed that rain and snowmelt reflected the chemical characteristics of precipitation, with groundwater and snowmelt being the primary sources of water flow. Different types of groundwater were identified in the region, with varying levels of permeability and recoverability.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2021)
Article
Engineering, Environmental
Atiyeh Mojiri-Khozani, Hamid Reza Nassery, Yaser Nikpeyman, Hossein Abedian
Summary: This study assesses the impact of the Koohrang III tunnel in Iran on the contiguous springs that provide water for drinking and agricultural activities. Prior to tunnel sealing, water seepage into the tunnel was estimated at 11.6 MCM/year, with the highest seepage occurring in karstic formations. After sealing, the total water seeping into the tunnel decreased to about 5.1 MCM/year. The tunnel excavation has caused a decrease in the flow of some springs.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Biodiversity Conservation
Takahiro Hosono, Kana Taniguchi, A. T. M. Sakiur Rahman, Tatsuki Yamamoto, Koki Takayama, Zhi-Qiang Yu, Taito Aihara, Takatomo Ikehara, Hiroki Amano, Masaharu Tanimizu, Kei Nakagawa
Summary: Stable nitrogen and oxygen isotopic tracers are important for studying groundwater nitrate contamination and natural attenuation capacity. This study collected groundwater samples over a 10-year period and analyzed isotope changes along with social databases. The results showed a shift in pollution sources from chemical fertilizers to animal waste leakage, which was consistent with agricultural census data. Monitoring isotopic indicators with long-term social datasets can provide valuable information for groundwater quality assessment.
ECOLOGICAL INDICATORS
(2023)
Article
Engineering, Civil
Xumei Mao, Dongbo Zhu, Innocent Ndikubwimana, Yaoye He, Zide Shi
Summary: The study investigated the hydrothermal circulation in Xinzhou geothermal field near the coast of South China using water chemistry and stable isotopes. It found that thermal and non-thermal groundwaters have different salinity and chemical types, with thermal waters possibly derived from water-rock interactions at high temperature. Thermal groundwater flow in deep faults is driven by thermodynamic buoyancy in the conceptual circulation model.
JOURNAL OF HYDROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jonathan Schenk, Henrique O. Sawakuchi, Anna K. Sieczko, Gustav Pajala, David Rudberg, Emelie Hagberg, Kjell Fors, Hjalmar Laudon, Jan Karlsson, David Bastviken
Summary: Methane plays a crucial role in the carbon cycling of lakes, with methane oxidation serving as a powerful tool to determine whether methane is oxidized or emitted in lakes. In boreal lakes, the δC-13 of methane sources in littoral sediments is consistently higher than that in deep waters, potentially due to variability in organic matter substrates. Additionally, lateral hydrological transport of methane from catchment areas may be an important factor in lake methane cycling.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Cuiping Gao, Yunlong Wang, Yu Xia, Haixian Liu, Weiguo Cheng, Yi Xie, Yuesuo Yang
Summary: Compound specific isotope analysis (CSIA) and enantiomer specific isotope analysis (ESIA) were used to assess the fate of hexachlorocyclohexanes (HCHs) in water. The liquid-liquid extraction method was compatible with CSIA and ESIA, and showed negligible changes in the carbon isotopes of HCHs. This method was validated and successfully used to differentiate HCHs from different manufacturers, identify in situ degradation of HCHs in groundwater, and resolve carbon isotope fractionation. The results showed the potential of this method for identifying HCH degradation in water.
Article
Environmental Sciences
Abdulhalim Zaryab, Hamid Reza Nassery, Kay Knoeller, Farshad Alijani, Eddy Minet
Summary: This study investigates the geochemistry and stable isotope composition of the Kabul urban aquifer, the main source of drinking water for Kabul city's inhabitants. The findings suggest that nitrate pollution in the aquifer primarily originates from sewage rather than artificial fertilizer. The results highlight the importance of improving sewage collection systems in the Kabul Plain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Shiyin Ma, Liang Zhao, Shichang Li, Tao Gao, Feng Peng
Summary: High pressure is a powerful tool for discovering novel inorganic species in high oxidation states, such as the stable transition metal fluorides with a +6 oxidation state. We propose three guiding rules based on the stability prediction of PdF6 to find these stable TM fluorides, and successfully predict new TMF6 species with the space group Pnma and a +6 oxidation state using a particle swarm optimization algorithm and first-principles calculations. These findings provide an understanding of the high +6 oxidation state for TM elements and are important for predictive discoveries of new fluorides with high oxidation states.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Geochemistry & Geophysics
Changjian Zou, Yunde Liu, Huanying Pan, Yujuan Lei, Lihe Yin, Ziyong Sun
Summary: This study investigates and compares the enrichment mechanisms of fluoride (F-) in groundwater from different aquifer systems in Aksu, Xinjiang, using hydro-geochemistry, environmental isotopes, and hydrogeochemical reverse simulations. The results show that low-fluoride groundwater is mainly distributed in the recharge area, while high-fluoride groundwater is mainly distributed in the runoff and discharge areas. The main enrichment mechanisms of F- in different aquifer systems involve the dissolution of fluorinated minerals (fluorite and biotite) and cation exchange. Recharge from irrigation water and deep groundwater can influence the F-content of groundwater. Evaporation has a weak effect on F-enrichment. This study provides insights into the rational development of local water resources and contributes to the understanding of common F-enrichment mechanisms in similar arid basins globally.
APPLIED GEOCHEMISTRY
(2023)
Article
Environmental Sciences
Yang Tang, Ruiyin Han
Summary: Surface water samples from Maolan National Natural Reserved Park were analyzed for major ions and carbon, sulfur isotopes from September 2013 to June 2014. The results suggest that bicarbonate and sulfate are the main anions in the watershed, indicating an influence of rock weathering on water chemistry. Additionally, human activities have led to higher sulfate content in some sample sites.
Article
Chemistry, Applied
Wei Xia, Xiangjun Fang, Yuan Gao, Weijie Wu, Yanchao Han, Ruiling Liu, Hailong Yang, Hangjun Chen, Haiyan Gao
Summary: Food quality, safety, and nutrient metabolism play a key role in human health. However, contaminants and metabolic dysregulation in food can be problematic. Chromatography-mass spectrometry technology, especially when combined with stable isotopes, is widely used in food analysis and nutrient metabolism research. This study provides an overview of stable isotope technology applications in quantifying contaminant residues and nutrient metabolism, aiming to contribute to effective analysis techniques for protecting food quality and human health.
Article
Environmental Sciences
Prikash N. Meetei, Rajeev Saran Ahluwalia, S. P. Rai, Suhas Khobragade, Shushanta Sarangi, Manmohan Goel, Sushi Kumar
Summary: This study used MODIS Terra data to analyze the spatiotemporal variation of snow cover area (SCA) and its relationship with topography in the Upper Ganga River Basin. The results showed that the Bhagirathi River Basin had the highest SCA, while the Pindar River Basin had the lowest SCA. The Mandakini River Basin had the highest rate of change of SCA. Slopes with a gradient of 20 to 30 degrees were more favorable for snow accumulation. Snow accumulation was highest in the north and northwest aspect in January and lowest in July.
GEOCARTO INTERNATIONAL
(2022)
Article
Geography, Physical
Rajeev S. Ahluwalia, S. P. Rai, Prikash N. Meetei, Sushil Kumar, Shushanta Sarangi, Pankaj Chauhan, Indira Karakoti
Summary: Spatial-diurnal variability in the isotope signature of snow/glacier meltwater and its influence on hydrograph separation using a mixing model were investigated in a high elevation catchment in the central Himalaya. Results showed that the river water isotope signature is close to snow/glacier melt runoff signature, indicating a higher contribution of snow/glacier melt runoff to river flow. The study highlights the importance of multiple sampling approaches to characterize snow/glacier melt and the role of groundwater dynamics in catchments with snow/glacial runoff regime.
QUATERNARY INTERNATIONAL
(2021)
Article
Environmental Sciences
Puthiyotil Nijesh, Kossitse Venyo Akpataku, Abhinav Patel, Prashant Rai, Shive Prakash Rai
Summary: The study indicates that groundwater from an unconfined aquifer in Western Uttar Pradesh, India is predominantly hard and neutral to alkaline in nature. The major ions in the groundwater are Na+, Ca2+, Mg2+, and K+ for cations, and Cl-, HCO3-, and SO42- for anions. There is a strong positive correlation between various hydrochemical parameters, and some samples exceed permissible limits for hardness and nitrate concentrations.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Environmental Sciences
Sandeep K. Malyan, Omkar Singh, Amit Kumar, Gagan Anand, Rajesh Singh, Sandeep Singh, Zhiguo Yu, Jhlaesh Kumar, Ram K. Fagodiya
Summary: Inland water bodies, particularly ponds, emit significant amounts of greenhouse gases, mainly methane and carbon dioxide, with emission rates influenced by various factors and requiring comprehensive evaluation.
Article
Environmental Sciences
Ali Mohammad Rahmani, Vinay Kumar Tyagi, Banafsha Ahmed, A. A. Kazmi, Chandra Shekhar P. Ojha, Rajesh Singh
Summary: The co-digestion of three feedstocks resulted in a 20% higher biogas yield compared to mono-digestion. An inoculum to substrate ratio (ISR) of 2, a carbon to nitrogen ratio (C:N) of 35, and a total solid (TS) percentage of 12.5% were found to be optimal.
ENVIRONMENTAL RESEARCH
(2022)
Article
Thermodynamics
Phurba Tamang, Vinay Kumar Tyagi, Neelam Gunjyal, Ali Mohammad Rahmani, Rajesh Singh, Pradeep Kumar, Banafsha Ahmed, Pooja Tyagi, Rajesh Banu, Sunita Varjani, A. A. Kazmi
Summary: This study presents a novel free nitrous acid (FNA) pretreatment to enhance the biomethanation of wheat straw. The results showed that FNA pretreatment can effectively improve the biogas yield from wheat straw, and even co-digestion could achieve enhanced biogas yield over mono-digestion.
Article
Engineering, Environmental
Kaptan Singh, Rajesh Singh, Govind Pandey
Summary: The Bathinda district in Punjab, India has the highest rate of cancer patients per capita. Groundwater is the main source of drinking and irrigation in the district. Hydrogeochemical analysis revealed that the water in the district belongs to the Mg-SO4 type, with major cation concentrations influenced by rock-water interaction and irrigation return flow. After the monsoon season, 95% of the samples were classified as very poor for drinking purposes due to elevated levels of U, As, and NO3. The average cumulative risk posed by contaminants in the drinking water indicated a higher risk of non-cancerous health issues.
Article
Environmental Sciences
Sandeep Singh, Meenakshi Rawat, Sandeep K. Malyan, Rajesh Singh, Vinay Kumar Tyagi, Kaptan Singh, Sujata Kashyap, Sumant Kumar, Manish Sharma, B. K. Panday, R. P. Pandey
Summary: The use of pesticides has greatly contributed to global agricultural production, but their unregulated use poses a threat to water resources and human health. Pesticides can contaminate groundwater and surface waters, leading to acute or chronic toxicity and adverse environmental effects. It is crucial to monitor and remove pesticides from water resources as a global priority.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Jeffrey P. Westrop, Pooja Yadav, P. J. Nolan, Kate M. Campbell, Rajesh Singh, Sharon E. Bone, Alicia H. Chan, Anthony J. Kohtz, Donald Pan, Olivia Healy, John R. Bargar, Daniel D. Snow, Karrie A. Weber
Summary: Groundwater uranium concentrations above the EPA maximum contaminant level have been found in many US aquifers, including those not associated with anthropogenic contamination. In this study, it was demonstrated that high-nitrate porewater can stimulate a microbial community that can mobilize naturally occurring uranium from sediments. Microbial reduction of nitrate produced nitrite, which abiotically mobilized uranium from aquifer sediments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
N. R. Cherukuri, P. Parthasarathy
Summary: FW management through AD is important to reduce its carbon footprint. This study investigated the physicochemical characteristics of three rice-based cooked FWs for biogas production. Results showed that VFW had higher total solids and ash content, while LFW had the least biogas production due to high lignocellulose content. VFW and MFW were found to be highly suitable for biogas production due to their high degradability.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Nithin Raja Cherukuri, Purushothaman Parthasarathy
Summary: The improper disposal of food waste and garden waste results in a significant amount of waste being sent to landfills. This study evaluates different pretreatment processes for anaerobic digestion of food waste and its co-digestion with garden waste. The results show that thermal and extrusion pretreatment methods increase biogas production compared to conventional digestion, and the sequential hybrid pretreatment method yields the highest biogas production.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2023)
Article
Engineering, Environmental
Abhinav Patel, Shive Prakash Rai, Kossitse Venyo Akpataku, Nijesh Puthiyottil, Abhinesh Kumar Singh, Neeraj Pant, Rajesh Singh, Prashant Rai, Jacob Noble
Summary: The present study focuses on the hydrogeochemical evolution of groundwater in the Middle Ganga Basin, revealing rapid depletion of water quality and quantity. Around 20.2% of the groundwater in the area is found to be unsuitable for drinking purposes. The study also investigates the chemical characteristics and evolution processes of groundwater in different regions, and provides mathematical modeling for sustainable groundwater management strategies.
GROUNDWATER FOR SUSTAINABLE DEVELOPMENT
(2023)
Article
Environmental Sciences
S. Nagaraj, P. Purushothaman
Summary: Understanding the relative influence of physical factors on groundwater levels is crucial for sustainable solutions to water-related problems. This study used a novel grid-based delineation technique to assess the influence of factors such as rainfall, lithology, and land use on groundwater levels in the Lower Palar River Basin in South India. The results showed that rainfall had the highest level of influence, followed by lithology and land use. Soil texture and infiltration number were found to have a significant impact on groundwater resilience. The grid-based delineation method proved to be effective in identifying the grids with significant influence and can be used efficiently in groundwater studies.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Environmental Sciences
Sandeep Singh, Sandeep K. Malyan, Chinmay Maithani, Sujata Kashyap, Vinay Kumar Tyagi, Rajesh Singh, Sarthak Malhotra, Manish Sharma, Amit Kumar, Bijay K. Panday, R. P. Pandey
Summary: Landfills can lead to microplastic pollution as plastic waste degrades and releases microplastics into the surrounding environment, contaminating soil and water. This paper provides a comprehensive review of the degradation process of macroplastics into microplastics, the types of microplastics in landfill leachate, and the potential toxicity of microplastic pollution. Various treatment methods, including chemical precipitation and filtration, can effectively remove microplastics from wastewater. Continuous monitoring and effective removal of microplastics from landfill leachate are important to protect human and environmental health.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Augustine Crispin, Purushothaman Parthasarathy
Summary: This study aims to extract, measure, and classify microplastics in sediment samples from Noyyal River in South India during monsoon and summer seasons. Microplastics were detected in forms of foams, films, fragments, and fibers. The dominant polymer types varied between seasons, with different degradation and surface morphologies observed. Despite lower Pollution Load Index (PLI), microplastics pose an extreme danger threat to the environment during the summer season compared to the monsoon.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
