E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||4|
|Section||Organic Geochemistry, Biogeochemistry, Formation of Oil and Gas Deposits|
|Published online||07 June 2019|
Characteristics of dissolved organic matter in shallow groundwater in the Hetao basin
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China
2 School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China
3 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China
* Corresponding author: email@example.com
Dissolved organic matter (DOM) in both high As groundwater and low As groundwater were sampled from the Hetao basin and characterized by FT-ICR-MS for OM molecular characteristics. Results show that the greater number of molecular formulas was identified in DOM of high As groundwater (5125), compared to the number in DOM of low As groundwater (3603). Among them, lignins and aromatic structures were the most abundant compounds in both high As groundwater and low As groundwater, with 4434 formulas and 2944 formulas identified, respectively. The number of biodegradable compounds (aliphatic/proteins, lipids, and carbohydrates) was less in high As groundwater (197) than that in low As groundwater (279). Higher proportion of lignins and aromatic structures (86.5%) would lead to complexation between As and DOM, which enhanced As mobility. On the other hand, higher proportion of lignins and aromatic structures and lower proportion of bioavailable compounds in high As groundwater supported the hypothesis that more bioavailable compounds were consumed and resulted in the enrichment of lignins and aromatic structures and As release into groundwater.
© The Authors, published by EDP Sciences, 2019
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