Spatial variation in arsenic and fluoride concentrations of shallow groundwater from the town of Shahai in the Hetao basin, Inner Mongolia
► Groundwater As and F− concentration show a large spatial variation. ► Within depths
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| Veröffentlicht in: | Applied geochemistry 2012-11, Vol.27 (11), p.2187-2196 |
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| creator | Guo, Huaming Zhang, Yang Xing, Lina Jia, Yongfeng |
| description | ► Groundwater As and F− concentration show a large spatial variation. ► Within depths |
| doi_str_mv | 10.1016/j.apgeochem.2012.01.016 |
| format | Article |
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Twenty-nine wells were selected for groundwater sampling in the town of Shahai, in the Hetao basin, Inner Mongolia. Four multilevel samplers were installed for monitoring groundwater chemistry at depths of 2.5–20m. Results show that groundwater As exhibits a large spatial variation, ranging between 0.96 and 720μg/L, with 71% of samples exceeding the WHO drinking water guideline value (10μg/L). Fluoride concentrations range between 0.30 and 2.57mg/L. There is no significant correlation between As and F− concentrations. Greater As concentrations were found with increasing well depth. However, F− concentrations do not show a consistent trend with depth. Groundwater with relatively low Eh has high As concentrations, indicating that the reducing environment is the major factor controlling As mobilization. Low As concentrations (<10μg/L) are found in groundwater at depths less than 10m. High groundwater As concentration is associated with aquifers that have thick overlying clay layers. The clay layers, mainly occurring at depths <10m, have low permeability and high organic C content. These strata restrict diffusion of atmospheric O2 into the aquifers, and lead to reducing conditions that favor As release. Sediment composition is an additional factor in determining dissolved As concentrations. In aquifers composed of yellowish-brown fine sands at depths around 10m, groundwater generally has low As concentrations which is attributed to the high As adsorption capacity of the yellow–brown Fe oxyhydroxide coatings. Fluoride concentration is positively correlated with pH and negatively correlated with Ca2+ concentration. All groundwater samples are over-saturated with respect to calcite and under-saturated with respect to fluorite. Dissolution and precipitation of Ca minerals (such as fluorite and calcite), and F− adsorption–desorption are likely controlling the concentration of F− in groundwater.</description><identifier>ISSN: 0883-2927</identifier><identifier>EISSN: 1872-9134</identifier><identifier>DOI: 10.1016/j.apgeochem.2012.01.016</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>adsorption ; Aquifers ; arsenic ; calcite ; calcium ; clay ; coatings ; Concentration (composition) ; Correlation ; Dissolution ; drinking water ; Fluorides ; Fluorite ; Groundwater ; guidelines ; iron ; iron oxyhydroxides ; monitoring ; oxygen ; permeability ; samplers ; sediments ; Towns ; wells</subject><ispartof>Applied geochemistry, 2012-11, Vol.27 (11), p.2187-2196</ispartof><rights>2012 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c471t-263637bdf4ac1f09e11952c68fc19f4dc7df5e60f74dbcf26eb947c7737e2de83</citedby><cites>FETCH-LOGICAL-c471t-263637bdf4ac1f09e11952c68fc19f4dc7df5e60f74dbcf26eb947c7737e2de83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.apgeochem.2012.01.016$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,45974</link.rule.ids></links><search><creatorcontrib>Guo, Huaming</creatorcontrib><creatorcontrib>Zhang, Yang</creatorcontrib><creatorcontrib>Xing, Lina</creatorcontrib><creatorcontrib>Jia, Yongfeng</creatorcontrib><title>Spatial variation in arsenic and fluoride concentrations of shallow groundwater from the town of Shahai in the Hetao basin, Inner Mongolia</title><title>Applied geochemistry</title><description>► Groundwater As and F− concentration show a large spatial variation. ► Within depths <30m, As concentrations increase with increasing depth. ► Fluoride concentrations do not show a consistent trend with depth. ► Desorption, evaporation and precipitation are controlling F− concentration. ► Reducing environment is the major factor controlling As mobilization.
Twenty-nine wells were selected for groundwater sampling in the town of Shahai, in the Hetao basin, Inner Mongolia. Four multilevel samplers were installed for monitoring groundwater chemistry at depths of 2.5–20m. Results show that groundwater As exhibits a large spatial variation, ranging between 0.96 and 720μg/L, with 71% of samples exceeding the WHO drinking water guideline value (10μg/L). Fluoride concentrations range between 0.30 and 2.57mg/L. There is no significant correlation between As and F− concentrations. Greater As concentrations were found with increasing well depth. However, F− concentrations do not show a consistent trend with depth. Groundwater with relatively low Eh has high As concentrations, indicating that the reducing environment is the major factor controlling As mobilization. Low As concentrations (<10μg/L) are found in groundwater at depths less than 10m. High groundwater As concentration is associated with aquifers that have thick overlying clay layers. The clay layers, mainly occurring at depths <10m, have low permeability and high organic C content. These strata restrict diffusion of atmospheric O2 into the aquifers, and lead to reducing conditions that favor As release. Sediment composition is an additional factor in determining dissolved As concentrations. In aquifers composed of yellowish-brown fine sands at depths around 10m, groundwater generally has low As concentrations which is attributed to the high As adsorption capacity of the yellow–brown Fe oxyhydroxide coatings. Fluoride concentration is positively correlated with pH and negatively correlated with Ca2+ concentration. All groundwater samples are over-saturated with respect to calcite and under-saturated with respect to fluorite. Dissolution and precipitation of Ca minerals (such as fluorite and calcite), and F− adsorption–desorption are likely controlling the concentration of F− in groundwater.</description><subject>adsorption</subject><subject>Aquifers</subject><subject>arsenic</subject><subject>calcite</subject><subject>calcium</subject><subject>clay</subject><subject>coatings</subject><subject>Concentration (composition)</subject><subject>Correlation</subject><subject>Dissolution</subject><subject>drinking water</subject><subject>Fluorides</subject><subject>Fluorite</subject><subject>Groundwater</subject><subject>guidelines</subject><subject>iron</subject><subject>iron oxyhydroxides</subject><subject>monitoring</subject><subject>oxygen</subject><subject>permeability</subject><subject>samplers</subject><subject>sediments</subject><subject>Towns</subject><subject>wells</subject><issn>0883-2927</issn><issn>1872-9134</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqNkc9uEzEQxi0EEqHwDPWRAxs83j_ePVYV0EpFHELP1sQeZx1t7GBvGvUVeGq8BHEFaWSPrN_3zcgfY9cg1iCg-7hf43FH0Yx0WEsBci2gVPeCraBXshqgbl6ylej7upKDVK_Zm5z3QohWCbliPzdHnD1O_AmTL10M3AeOKVPwhmOw3E2nmLwlbmIwFOb0m8o8Op5HnKZ45rsUT8GecabEXYoHPo_E53gOC7QZcUS_uC6vdzRj5FvMPnzg9yEUxdcYdnHy-Ja9cjhlevfnvmKPnz99v72rHr59ub-9eahMo2CuZFd3tdpa16ABJwYCGFpput4ZGFxjjbKupU441ditcbKj7dAoo1StSFrq6yv2_uJ7TPHHifKsDz4bmiYMFE9ZQ9dCUw75Hygo6PuyjiyouqAmxZwTOX1M_oDpWYPQS1B6r_8GpZegtIBSXVFeX5QOo8Zd8lk_bgrQCiGFBFjWuLkQVL7lyVPS2XgqaVifyMzaRv_PKb8AvYer7g</recordid><startdate>20121101</startdate><enddate>20121101</enddate><creator>Guo, Huaming</creator><creator>Zhang, Yang</creator><creator>Xing, Lina</creator><creator>Jia, Yongfeng</creator><general>Elsevier Ltd</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7ST</scope><scope>7TG</scope><scope>7TV</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H97</scope><scope>KL.</scope><scope>L.G</scope><scope>SOI</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20121101</creationdate><title>Spatial variation in arsenic and fluoride concentrations of shallow groundwater from the town of Shahai in the Hetao basin, Inner Mongolia</title><author>Guo, Huaming ; Zhang, Yang ; Xing, Lina ; Jia, Yongfeng</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c471t-263637bdf4ac1f09e11952c68fc19f4dc7df5e60f74dbcf26eb947c7737e2de83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>adsorption</topic><topic>Aquifers</topic><topic>arsenic</topic><topic>calcite</topic><topic>calcium</topic><topic>clay</topic><topic>coatings</topic><topic>Concentration (composition)</topic><topic>Correlation</topic><topic>Dissolution</topic><topic>drinking water</topic><topic>Fluorides</topic><topic>Fluorite</topic><topic>Groundwater</topic><topic>guidelines</topic><topic>iron</topic><topic>iron oxyhydroxides</topic><topic>monitoring</topic><topic>oxygen</topic><topic>permeability</topic><topic>samplers</topic><topic>sediments</topic><topic>Towns</topic><topic>wells</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Guo, Huaming</creatorcontrib><creatorcontrib>Zhang, Yang</creatorcontrib><creatorcontrib>Xing, Lina</creatorcontrib><creatorcontrib>Jia, Yongfeng</creatorcontrib><collection>AGRIS</collection><collection>CrossRef</collection><collection>Aqualine</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Pollution Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 3: Aquatic Pollution & Environmental Quality</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied geochemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Guo, Huaming</au><au>Zhang, Yang</au><au>Xing, Lina</au><au>Jia, Yongfeng</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spatial variation in arsenic and fluoride concentrations of shallow groundwater from the town of Shahai in the Hetao basin, Inner Mongolia</atitle><jtitle>Applied geochemistry</jtitle><date>2012-11-01</date><risdate>2012</risdate><volume>27</volume><issue>11</issue><spage>2187</spage><epage>2196</epage><pages>2187-2196</pages><issn>0883-2927</issn><eissn>1872-9134</eissn><abstract>► Groundwater As and F− concentration show a large spatial variation. ► Within depths <30m, As concentrations increase with increasing depth. ► Fluoride concentrations do not show a consistent trend with depth. ► Desorption, evaporation and precipitation are controlling F− concentration. ► Reducing environment is the major factor controlling As mobilization.
Twenty-nine wells were selected for groundwater sampling in the town of Shahai, in the Hetao basin, Inner Mongolia. Four multilevel samplers were installed for monitoring groundwater chemistry at depths of 2.5–20m. Results show that groundwater As exhibits a large spatial variation, ranging between 0.96 and 720μg/L, with 71% of samples exceeding the WHO drinking water guideline value (10μg/L). Fluoride concentrations range between 0.30 and 2.57mg/L. There is no significant correlation between As and F− concentrations. Greater As concentrations were found with increasing well depth. However, F− concentrations do not show a consistent trend with depth. Groundwater with relatively low Eh has high As concentrations, indicating that the reducing environment is the major factor controlling As mobilization. Low As concentrations (<10μg/L) are found in groundwater at depths less than 10m. High groundwater As concentration is associated with aquifers that have thick overlying clay layers. The clay layers, mainly occurring at depths <10m, have low permeability and high organic C content. These strata restrict diffusion of atmospheric O2 into the aquifers, and lead to reducing conditions that favor As release. Sediment composition is an additional factor in determining dissolved As concentrations. In aquifers composed of yellowish-brown fine sands at depths around 10m, groundwater generally has low As concentrations which is attributed to the high As adsorption capacity of the yellow–brown Fe oxyhydroxide coatings. Fluoride concentration is positively correlated with pH and negatively correlated with Ca2+ concentration. All groundwater samples are over-saturated with respect to calcite and under-saturated with respect to fluorite. Dissolution and precipitation of Ca minerals (such as fluorite and calcite), and F− adsorption–desorption are likely controlling the concentration of F− in groundwater.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.apgeochem.2012.01.016</doi><tpages>10</tpages></addata></record> |
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| subjects | adsorption Aquifers arsenic calcite calcium clay coatings Concentration (composition) Correlation Dissolution drinking water Fluorides Fluorite Groundwater guidelines iron iron oxyhydroxides monitoring oxygen permeability samplers sediments Towns wells |
| title | Spatial variation in arsenic and fluoride concentrations of shallow groundwater from the town of Shahai in the Hetao basin, Inner Mongolia |
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