地下水系统中砷活化的钼同位素地球化学指示

李梦娣; 周炼; 王焰新; 吴潇; 王帅

doi:10.3799/dqkx.2014.010

Volume 39 Issue 1

Jan. 2014

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Article Navigation > Earth Science > 2014 > 39(1): 99-107

Li Mengdi, Zhou Lian, Wang Yanxin, Wu Xiao, Wang Shuai, 2014. Molybdenum Isotope Geochemistry of Arsenic Mobilization in Groundwater System. Earth Science, 39(1): 99-107. doi: 10.3799/dqkx.2014.010

Citation:

Li Mengdi, Zhou Lian, Wang Yanxin, Wu Xiao, Wang Shuai, 2014. Molybdenum Isotope Geochemistry of Arsenic Mobilization in Groundwater System. Earth Science, 39(1): 99-107. doi: 10.3799/dqkx.2014.010

Li Mengdi, Zhou Lian, Wang Yanxin, Wu Xiao, Wang Shuai, 2014. Molybdenum Isotope Geochemistry of Arsenic Mobilization in Groundwater System. Earth Science, 39(1): 99-107. doi: 10.3799/dqkx.2014.010

Citation:

Li Mengdi, Zhou Lian, Wang Yanxin, Wu Xiao, Wang Shuai, 2014. Molybdenum Isotope Geochemistry of Arsenic Mobilization in Groundwater System. Earth Science, 39(1): 99-107. doi: 10.3799/dqkx.2014.010

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Molybdenum Isotope Geochemistry of Arsenic Mobilization in Groundwater System

doi: 10.3799/dqkx.2014.010

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2013-05-06
Publish Date: 2014-01-01

Abstract

Abstract

Arsenic (AS) mobilization is closely linked to redox state in nature.In basin environment, the primary mechanism governing arsenic mobility is the reductive dissolution of Fe/Mn-(hydr)oxides which results in the subsequent As released into groundwater. Molybdenum (Mo) and Mo isotope can be informative of the redox conditions. Moreover, Mo isotope fractionation is mainly controlled by the adsorption and desorption onto/from Fe/Mn-(hydr)oxides. This study applies Mo isotope ratio(δ⁹⁸Mo) of dissolved Mo in groundwater to arsenic mobilization in groundwater system for the very first time. The Mo isotope ratios (δ⁹⁸Mo) in groundwater in Datong basin range from -0.12‰ to 2.17‰, which are relatively heavier than those reported in fresh waters. δ⁹⁸Mo of Sanggan River shows a value of 0.72‰, comparable to the average δ⁹⁸Mo of riverine Mo isotopic composition of 0.7‰.δ⁹⁸Mo ratios of groundwater in Datong basin are positively correlated to dissolved sulfide, indicating that the formation of Mo-Fe-S complex preferentially co-precipitated the light Mo in groundwater resulting in the gradually increased δ⁹⁸Mo values under certain condition. The formation of Mo-Fe-S complex might be competitive to the similar formation of As-Fe-S complex, as is further confirmed by the weak correlation between As and Mo concentrations and the positive relationship between As and δ⁹⁸Mo ratios. This process leads to an elevation of As content in groundwater.The relatively heavier δ⁹⁸Mo ratio of groundwater might be a consequence of the faster rate of adsorption of light Mo from groundwater than the rate of desorption of Mo from Fe-(hydr)oxides and the re-adsorption of dissolved Mo in groundwater.The progressive processes decrease Mo content and elevate δ⁹⁸Mo ratio in groundwater, which is consistent with the observation in groundwater in Datong basin.The indicative δ⁹⁸Mo ratio of groundwater indicates that the reductive dissolution of Fe-(hydr)oxides also has important influence on arsenic mobilization in groundwater.
- arsenic,
- Mo isotope,
- Fe/Mn-(hydr) oxides,
- redox reactions,
- geochemistry,
- Datong basin

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References(51)

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