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Geogenic Imprint on Groundwater and Its Quality in Parts of the Mamfe Basin, Manyu Division, Cameroon 认领 引用 被引量：2
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作者 Richard Ayuk II Akoachere Thomson Areapkoh Eyong +3 位作者 Sonia Ebot Egbe Regina Engome Wotany Michael Obiekwe Nwude Omagbemi Omoloju Yaya 《Journal of Geoscience and Environment Protection》 2019年第5期184-211,共28页
Groundwater studies in parts of the Mamfe basin are sparse and the Mamfe area has the highest population density in the Mamfe basin. An in-depth study of groundwater rock interaction and groundwater quality is of vita... Groundwater studies in parts of the Mamfe basin are sparse and the Mamfe area has the highest population density in the Mamfe basin. An in-depth study of groundwater rock interaction and groundwater quality is of vital importance. This same part of the basin is the economic centre and as such development of businesses in this area requires knowledge of the groundwater quality. Therefore, this study was undertaken to determine the input of the rock formations on the groundwater solute chemistry and groundwater domestic-agro-industrial quality using hydrogeochemical tools and physicochemical parameters: Ionic ratios, Gibbs diagrams, Piper diagrams, Durov diagrams and water quality indices. From physicochemical parameters, in the rainy season, pH ranged from, 4.3 - 8.6;EC, 3 - 1348 μS/cm;Temperature, 24.4℃ - 30.1℃? andTDS, 2.01 - 903.16 mg/L and in the dry season, pH ranged from 5.5 - 9.3;EC, 6 - 994 μS/cm;Temperature, 25℃?- 38.6℃?andTDS, 4.02 - 632.48 mg/L. Forty groundwater samples: 20 per season, wet and dry were analysed. The major ions fell below WHO acceptable limits for both seasons. The sequences of abundance of major ions were: Ca2+ > K+ > Mg2+ > ?> Na+, Cl- > ?> ?> ?> NO3 in wet season and Ca2+ > Mg2+ > K+ > Na+, ?> Cl- > ?> ?> ?in dry season. Ion-exchange, simple dissolution and uncommon dissolution processes determined groundwater character. Groundwater ionic content was as a result of ion exchange from rock-weathering. Water types are: CaSO4 and MgHCO3 in both seasons. Hydrogeochemical facies are Ca-Mg-Cl-SO4 and Ca-Mg-HCO3. SAR for wet season 0.05 - 0.06 and dry season 0.00 - 0.05, %Na wet season 3.64 - 16.59 and dry season 1.22 - 10.97, KR wet season 0.01 - 0.02 and 0.00 <span style="font-size:10pt; 展开更多
关键词 Geogenic Imprint Hydrogeochemical Facies Groundwater Quality Mamfe Cameroon
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Geogenic versus Anthropogenic Metals and Metalloids 认领 引用
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作者 Jeffrey Hess Mark Sorensen 《Journal of Environmental Protection》 2018年第5期468-500,共33页
Developing a successful strategy for investigating and remediating sites potentially impacted by metals (such as chromium [Cr], copper [Cu], lead [Pb], nickel [Ni], and zinc [Zn]) and metalloids (such as arsenic [As] ... Developing a successful strategy for investigating and remediating sites potentially impacted by metals (such as chromium [Cr], copper [Cu], lead [Pb], nickel [Ni], and zinc [Zn]) and metalloids (such as arsenic [As] and antimony [Sb]) can be challenging. These elements occur naturally and geologic materials can be enriched in these elements by natural processes. Conventional environmental investigative methods do not readily support evaluating whether metals and metalloids are geogenic (naturally occurring) or anthropogenic (from human action), or allow differentiating multiple anthropogenic sources. Geochemical methods can potentially determine whether metals and metalloids are geogenic or anthropogenic, and differentiate between possible anthropogenic sources. Conventional geo-chemical methods include whole-rock analysis using x-ray fluorescence (XRF) to yield elemental concentrations;optical petrography and powder x-ray diffraction (XRD) to determine mineral phases present;and electron microprobe (EMP) to confirm both mineral phases present and the distribution of elements within mineral phases and the rock matrix. These methods, with the exception of the EMP, can be performed in the field using portable equipment, allowing for relatively rapid assessment of sites. A case study is presented in which these techniques were successfully utilized to demonstrate, using multiple lines of evidence, that metals and metalloids present in subsurface fractured rock were geogenic and unrelated to recent industrial operations. 展开更多
关键词 Geogenic Anthropogenic Metals Metalloids Geochemical
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Application of Multivariate Statistic of U, Th and Pb Concentrations and Pb Isotopic Signatures in the Assessment of Geogenic and Anthropogenic Sources in a U-Mineralized Area 认领 引用
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作者 Adriana Monica Dalla Vecchia Jorge Carvalho de Lena Ana Claudia Queiroz Ladeira 《Journal of Geoscience and Environment Protection》 2019年第6期1-12,共12页
This work presents a Principal Component Analysis (PCA) study using Pbisotope signatures and U, Th and Pb concentrations from groundwater, sediments and rocks (granites and orthogneisses) of the Complex of Lagoa Real ... This work presents a Principal Component Analysis (PCA) study using Pbisotope signatures and U, Th and Pb concentrations from groundwater, sediments and rocks (granites and orthogneisses) of the Complex of Lagoa Real (Bahia, Brazil). This area is naturally enriched in U and Th, with the occurrence of Pb derived from the radioactive decay of the elements (238U, 235U and 232Th) in the form of their stable isotopes 206Pb, 207Pb and 208Pb in addition to the natural isotope 204Pb. Sampling was carried out in the rainy season (December to January) and the points were selected according to regional hydrology and geology. Thirty samples were analyzed: 12 of groundwater (AP) and 18 of sediments (S). The results show that the use of isotopic ratios allows discrimination between geogenic and anthropogenic samples. This information is not obtained using only the analysis of concentration data. Statistically, the isotopic data of Pb stand out as an efficient tool in the characterization of sources in the scenario investigated, allowing an effective environmental monitoring and a better management of the mining activities. 展开更多
关键词 Environmental Monitoring Statistical Analysis Lead Stable Isotopes Anthropogenic Sources Geogenic Sources
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Emeishan basalt's contribution to heavy metals in topsoil(notably cadmium)in Southwest China from soil geochemistry evidence 认领 引用
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作者 Fang Yang Liang Tang +7 位作者 Yang Li Bo Cheng Tim T.Werner Lingfei Qu Ke Cheng Aiming Zhang Junbo Wang Guikai Li 《Acta Geochimica》 EI CAS CSCD 2026年第4期1102-1116,共15页
While geogenic processes are believed to be an important contributor to heavy metals in topsoil,notably cadmium(Cd),an understanding of heavy metal constraints from geological formations is hindered due to a lack of l... While geogenic processes are believed to be an important contributor to heavy metals in topsoil,notably cadmium(Cd),an understanding of heavy metal constraints from geological formations is hindered due to a lack of large-scale soil geochemical data.Addressing this,our study analyzed 15,181 topsoil samples(0-20 cm)collected from the Sichuan Basin,southwestern China,covering~25,500 km2of land.The results indicate that geogenic Cd is more concentrated in the topsoil of the Middle-Upper Permian(P2-3,~1.07 mg/kg)despite regional outcrops from Cambrian(2-3,0.52 mg/kg)to Quaternary(Qp,0.29 mg/kg)strata.We assume that the Emeishan basaltic lava that erupted in the Late Permian(P3e)in southwest China is an understudied factor.This erupted lava probably provided essential elements and heat necessary for heavy metal accumulation in a preferred sea-continental and marine environment,eventually facilitating leaching and diffusion of the metals.Ultimately,geological exposure and pedogenesis led to elevated metals in the topsoil of P2-3strata. 展开更多
关键词 Heavy metals Geogenic constraints Middle-Upper Permian Emeishan basalt
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Seasonal effects on groundwater fluoride and evaluating health hazards: In-situ remediation via managed aquifer recharge 认领 引用
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作者 D.Karunanidhi Meera Rajan +1 位作者 Priyadarsi D.Roy T.Subramani 《Geoscience Frontiers》 SCIE CAS CSCD 2025年第5期123-138,共16页
This research examines the hard-rock aquifer system within the Nagavathi River Basin(NRB)South India,by evaluating seasonal fluctuations in groundwater composition during the pre-monsoon(PRM)and post-monsoon(POM)perio... This research examines the hard-rock aquifer system within the Nagavathi River Basin(NRB)South India,by evaluating seasonal fluctuations in groundwater composition during the pre-monsoon(PRM)and post-monsoon(POM)periods.Seasonal variations significantly influence the groundwater quality,particularly fluoride(F−)concentrations,which can fluctuate due to changes in recharge,evaporation,and anthropogenic activities.This study assesses the dynamics of F−levels in PRM and POM seasons,and identifies elevated health risks using USEPA guidelines and Monte Carlo Simulations(MCS).Groundwater in the study area exhibits alkaline pH,with NaCl and Ca-Na-HCO3 facies increasing in the POM season due to intensified ion exchange and rock-water interactions,as indicated in Piper and Gibb’s diagrams.Correlation and dendrogram analyses indicate that F−contamination is from geogenic and anthropogenic sources.F−levels exceed the WHO limit(1.5 mg/L)in 51 PRM and 28 POM samples,affecting 371.74 km2 and 203.05 km2,respectively.Geochemical processes,including mineral weathering,cation exchange,evaporation,and dilution,are identified through CAI I&II.Health risk assessments reveal that HQ values>1 in 78%of children,73%of teens,and 68%of adults during PRM,decreasing to 45%,40%,and 38%,respectively,in POM.MCS show maximum HQ values of 5.67(PRM)and 4.73(POM)in children,with all age groups facing significant risks from fluoride ingestion.Managed Aquifer Recharge(MAR)is recommended in this study to minimize F−contamination,ensuring safe drinking water for the community. 展开更多
关键词 Fluoride Seasonal fluctuations Geochemical processes Geogenic sources Managed aquifer recharge
Achieving Sustainable Use and Management of Water Resources for Irrigation in Nigeria 认领 引用 被引量：3
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作者 Moses Oghenenyoreme Eyankware Ezekiel Obinna Igwe +1 位作者 Christopher Ogwah Ruth Oghenerukevwe Eyankware Ulakpa 《Journal of Environmental & Earth Sciences》 CAS 2020年第2期47-55,共9页
Water resource is available in Nigeria to meet water demand for domestic,agricultural and industrial use.If well enhanced and protected from various source of pollution.However,less information is available on suitabi... Water resource is available in Nigeria to meet water demand for domestic,agricultural and industrial use.If well enhanced and protected from various source of pollution.However,less information is available on suitability of water resources for irrigation use in Nigeria.This article reviews literature of the past with regards to influence of geogenic and anthropogenic activities on water resource for irrigation purpose in Nigeria and also to explain the current state of suitability of water resource for irrigation studies in Nigeria and gaps in studies.It also summarizes future ways on water resource management and preventive measure for water resource pollution for irrigation use.Related articles were downloaded from Google scholar in water-related issues.This paper tends to review previous article on water resource in Nigeria,and its suitability for irrigation.The primary aim of this paper is to produce a synoptic overview of the water resources in Nigeria and its suitability for irrigation use.From paper reviewed it was observed that 89%of water resources was considered suitable for irrigation. 展开更多
关键词 Geogenic Anthropogenic Irrigation indices Suitability and Nigeria
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A Comprehensive Review of Water Quality Monitoring and Assess­ment in Delta State,Southern Part of Nigeria 认领 引用 被引量：1
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作者 Moses Oghenenyoreme Eyankware Bassey Edem Ephraim 《Journal of Environmental & Earth Sciences》 CAS 2021年第1期16-28,共13页
This research presents a review on water resources in Delta state,southern part of Nigeria,with emphasis on hydrogeochemical and microbial assessment.It evaluates factors responsible for water contamination,and their ... This research presents a review on water resources in Delta state,southern part of Nigeria,with emphasis on hydrogeochemical and microbial assessment.It evaluates factors responsible for water contamination,and their resulting health challenges within the study area.To achieve the objective of this study,related articles were downloaded from Google,published article on influence of hydrogeochemical and microbial activities on water resources.These articles were thoroughly studied.Findings from this study,suggested that groundwater was more studied than surface water.We also observed that groundwater within the riverine communities is much more prone to pollution when compared to groundwater in an upland area.Results from various authors suggested that,larger percentage of groundwater showed presence of coliform.Further findings suggested that geochemical processes such as rock water interaction,seawater intrusion and precipitation influences groundwater quality within the study area especially within Sombreiro-Warri Deltaic Plain Deposit. 展开更多
关键词 Geogenic Anthropogenic Hydrogeochemical Cause of pollution Coliform Nigeria
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Comparative Assessment of Heavy Metals Pollution in Surface Water in Ikoli River and Epie Creek in Yenagoa Metropolis Using Geographical Information System 认领 引用
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作者 Egai Ayibawari O. Edirin Akpofure Digha Opaminola Nicholas 《Journal of Geographical Research》 2022年第3期49-62,共14页
The article is the investigation of heavy metals pollution on surface water in Ikoli River and Epie creek in Yenagoa,metropolis,Bayelsa State.Pb,Cd,Ni,Cr,Fe,Zn was determined and evaluated using Geographical Informati... The article is the investigation of heavy metals pollution on surface water in Ikoli River and Epie creek in Yenagoa,metropolis,Bayelsa State.Pb,Cd,Ni,Cr,Fe,Zn was determined and evaluated using Geographical Information System.Zinc concentration was below the permissible limit of 3 mg/L in all the locations sampled.Iron is 77.78%below the limit of WHO 2011 of 0.3 mg/L while other heavy metals examined in Ikoli River and Epie creek are highly polluted.The pollution index for contamination index shows 11.11%sample are high and 88.89%are low while the evaluation of heavy metal index and the pollution index load of the heavy metals contain 22.11%of the sample are low and 77.78%are high which imply the Ikoli River and Epie creek is polluted.Multivariate treatment of the result revealed a good correlation between the PCA and HCA,which showed activities of natural processes and man influenced environmental sources of the heavy metals which were mainly products of automobiles exhaust,water tank leakages as well as dumping of radioactive wastes and burning.The study investigated successfully the potential use of GIS with the help of multiple criteria decision analysis to predict and characterize areas of high pollution,medium,and low pollution in the study area. 展开更多
关键词 Multivariate treatment GIS Pollution index Anthropogenic Geogenic Ikoli river Epie Creek
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Sanitary Surveys and Hydrochemistry of Groundwater in Two Urban Towns (Ado-Ekiti and Ijero-Ekiti), Southwestern Nigeria 认领 引用
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作者 Abel Ojo Talabi Lekan Olatayo Afolagboye +1 位作者 Christopher Ayodele Ajayi Olufunke Kolawole 《Journal of Geoscience and Environment Protection》 2022年第7期159-185,共27页
Groundwater contamination in urban cities is imminent in the phase of increased anthropogenic activities apart from the contribution of geogenic contaminants. This study examined the sanitary surveys and hydrochemistr... Groundwater contamination in urban cities is imminent in the phase of increased anthropogenic activities apart from the contribution of geogenic contaminants. This study examined the sanitary surveys and hydrochemistry of groundwater in Ado-Ekiti and Ijero-Ekiti to establish the contaminants’ sources, decipher the effects of urbanization on population and explain any relationship between the surveys and the groundwater chemistry. Sanitary surveys of 30 randomly selected wells each from Ado-Ekiti and Ijero-Ekiti were executed by administering and processing appropriately designed questionnaires that addressed salient problems of hygiene and sanitation. The results of the surveys were grouped into very high risk, high risk, intermediate risk, and low risk classes. Subsequently, at each location, in situ parameters (temperature (°C), pH and EC (μS/cm)) were measured using a portable Multi-parameter TestrTM 35 Series S/N: 1382654. At each well, water samples were collected into clean polyethylene bottles in triplicates for cation, anions and e-coli evaluations, respectively. Water samples for cations were acidified by adding two drops of concentrated nitric acid. All samples were kept in a refrigerator at a low temperature of about 4°C before being taken to the Federal University of Technology, Akure, for analyses. Ion chromatography was employed for the anions analysis while the cations were determined using an Atomic Absorption Spectrophotometer Buck 210 model. Membrane filter technique was employed for the e-coli estimation. From the results of the hydrochemistry, the Nitrate Pollution Index (NPI) and Modified Nitrate Pollution Index (MNPI) were estimated and classified into;clean unpolluted, light pollution, moderate pollution, significant pollution, very significant pollution waters. Sanitary surveys in the two cities showed that in the very low risk, intermediate and high-risk categories, Ado-Ekiti had 33.33%, 56.67% and 10% representations, while Ijero-Ekiti had 50%, 23.33% and 26.67% representations, respectively. This observation showed that Ado-Ekiti with higher population and humans’ activities compared to Ijero-Ekiti was less susceptible to pollution. Urbanization has no direct effects on sanitary surveys. The pH of wells’ water in Ado-Ekiti ranged from 4.8 - 8.2, EC (μS/cm) from 101 - 1008, while at Ijero-Ekiti, the pH and EC (μS/cm) varied from 2.1 - 13.8 and 80 - 1008 respectively. Ado-Ekiti wells’ water was more acidic than that of Ijero-Ekiti. Chemical concentrations (mg/L) of Ca2+, Mg2+, Na+, K+, , and Clˉ of the wells’ water in both cities were within WHO-approved standards for drinking water. However, with average concentrations of 142.17 (mg/L) and 252.71 (mg/L) at Ado-Ekiti and Ijero-Ekiti, respectively, exceeded the standard in many locations. Susceptibility to pollution classification employing TDS, NPI and MNPI showed that Ijero-Ekiti was more susceptible to pollution compared to Ado-Ekiti. This assertion was supported by statistical analysis employing correlation, cluster analysis, and principal component analysis. This study showed that urbanization had no direct effects on sanitary surveys and groundwater quality. Pollution of wells’ water in the two cities was, mainly from anthropogenic activities. However, Ijero-Ekiti, with significant anthropogenic activities, had its wells’ water more susceptible to pollution. Sanitary surveys are a complementary method to water quality monitoring. 展开更多
关键词 Urbanization Groundwater Quality Geogenic Contaminants Sanitary Surveys Hydrochemistry Nitrate Pollution Index
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Improved physics-informed neural network for reactive transport modeling of groundwater arsenic enrichment 认领 引用 被引量：1
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作者 Fang DENG Jichun WU +4 位作者 Yun YANG Junxia LI Xianjun XIE Jianguo JIANG Xiaobin ZHU 《Science China Earth Sciences》 SCIE EI CAS CSCD 2025年第9期2781-2796,共16页
The enrichment and migration of geogenic high-arsenic contaminated groundwater are controlled by complex hydrological conditions and hydrogeochemical processes.Conventional reactive transport models encounter dual cha... The enrichment and migration of geogenic high-arsenic contaminated groundwater are controlled by complex hydrological conditions and hydrogeochemical processes.Conventional reactive transport models encounter dual challenges,including poor convergence and low computational efficiency,when simulating multi-pathway reaction networks.To address these limitations,this study develops an improved physics-informed neural network(PH-PINNs)by integrating physical constraints with the PHREEQC geochemical module.The proposed model explicitly accounts for microbially mediated reaction networks involving iron-sulfur-carbon-nitrogen cycles,which drive arsenic enrichment and mobilization in groundwater.Leveraging field monitoring data from the Shanyin experimental site in the Datong Basin,Shanxi Province,a two-dimensional numerical model was constructed to simulate site-scale arsenic reactive transport.Results indicate that the PH-PINNs model significantly outperforms traditional PINNs in capturing nonlinear and non-stationary dynamics,reducing the root mean square error(RMSE)by over 50%.The model exhibits superior predictive accuracy,numerical stability,and adaptability for complex,multi-component reaction networks.This framework provides a robust tool for advancing both theoretical research and practical management of arsenic-contaminated groundwater systems. 展开更多
关键词 Geogenic contaminated groundwater Reactive network Numerical methods Microbially mediated PH-PINNs
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Towards a comprehensive understanding of the“Origin,distribution,and biogeochemistry of arsenic in the Altiplano-Puna plateau of South America”with the IGCP-707 project 认领 引用
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作者 Jesica Murray Joseline Tapia +2 位作者 Mauricio Ormachea Noemi Tirado D.Kirk Nordstrom 《Episodes》 SCIE 2023年第4期653-664,共12页
Arsenic(As)is one of the most prevalent geogenic trace elements in the groundwater environment that presents a worldwide health concern.In South America,the“Altiplano-Puna”plateau exhibits high As concentrations in ... Arsenic(As)is one of the most prevalent geogenic trace elements in the groundwater environment that presents a worldwide health concern.In South America,the“Altiplano-Puna”plateau exhibits high As concentrations in water that could be affecting 3 million inhabitants from Argentina,Bolivia,Chile,and Perú.In this As-rich environment with limited water resources,there exists a lack of knowledge regarding the basic geochemistry of As,water quality characterization,and affected population and biodiversity.Between 2020-2022 we performed interdisciplinary research to understand(i)the origin of As,(ii)its geochemistry and mobility,(iii)its distribution in the environment,and(iv)its effects in the local community and unique biodiversity.Our research provides new scientific insights into the biogeochemical cycle of As in the environment and its effect on human health and biodiversity.Our dissemination activities increased the visibility of the As issue for the region that had historically received little attention from the scientific community and local authorities.This project led to additional funding and the creation of a solid research network between the South and North hemispheres,fostering the participation of young researchers,students,and women.An extension of the project was obtained to continue our work during 2023. 展开更多
关键词 water resourcesthere altiplano puna plateau origin biogeochemistry geogenic trace elements arsenic distribution South America
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