Abstract：
:Natural dissolved organic matter (DOM) in groundwater plays a crucial role in mobilizing arsenic (As). The complex contribution of DOM sources makes it hard to predict how the variation of environmental conditions would affect the distribution of As concentrations. Identifying the carbon isotope fractionation of DOM is the key to quantify DOM sources based on stable carbon isotopes. To understand the magnitude and variability in the carbon isotopic fractionation of DOM in competitive adsorption with As(V), this study investigated the δ13C values of fulvic acid (FA) and DOM during adsorption to goethite in the presence of As(V), at a specific pH and temperature. The carbon isotopic enrichment factor (ε) of FA in the adsorption to goethite was 0.65 ± 2.11‰ at pH 4.1, 25 °C, suggesting that FA molecules containing 13C were more easily adsorbed to goethite. An increasing temperature increased εFA from 0.32 ± 1.17‰ to 0.82 ± 5.39‰ at 15-35 °C. For dissolved sediment organic matter (DSOM) cases, molecules containing 13C were more easily adsorbed to goethite. However, enrichment factors were not detected due to a reduction in DSOM adsorption and the diversity of natural humic substances or groups. The findings provide basic data for accurately ascertaining DOM sources through carbon isotopes, which is significant for predicting As fluctuation in aquifers affected by monsoon climate and/or human activities.
journal_name
Environ Geochem Healthjournal_title
Environmental geochemistry and healthauthors
Zhang Y,Gan Y,Yu K,Han Ldoi
10.1007/s10653-020-00644-wsubject
Has Abstractpub_date
2020-07-10 00:00:00eissn
0269-4042issn
1573-2983pii
10.1007/s10653-020-00644-wpub_type
杂志文章abstract：:Understanding the mechanism of arsenic (As) mobilization from sediments to groundwater is important for water quality management in areas of endemic arsenic poisoning, such as the Datong basin in northern China. The bulk geochemistry analysis of sediment samples from three 50-m boreholes drilled specifically for this ...
journal_title：Environmental geochemistry and health
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更新日期：1996-12-01 00:00:00
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更新日期：2018-08-01 00:00:00
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更新日期：2012-02-01 00:00:00
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更新日期：2020-03-01 00:00:00
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更新日期：1990-12-01 00:00:00
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更新日期：2004-03-01 00:00:00
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更新日期：2003-09-01 00:00:00
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更新日期：2019-04-01 00:00:00
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journal_title：Environmental geochemistry and health
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更新日期：1992-10-01 00:00:00
abstract：:This paper reviews from the geological and biological perspectives the achievements of Russian researchers in the field of geophagy, which have not been published in English. It is focused on publications in Russian language about (1) animal behavior related to geophagy, (2) mineral and chemical composition as well as...
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pub_type： 杂志文章,评审
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