The enrichment mechanisms of arsenic and three-dimensional fluorescence spectroscopy characteristics of dissolved organic matters in typical riverside groundwater sources of the Hailar River
Riverside groundwater is a common type of drinking water source in northern China,and its water quality and quantity are affected by both neighboring river courses and groundwater runoff supplement.Arsenic concentration in riverside groundwater along the Hailar River is high,which has attracted much attention.Dissolved organic matter(DOM)is a key factor of arsenic release in groundwater.This study investigated and monitored the arsenic content and DOM of the Hailar River and groundwater sources along the line,carried out three-dimensional fluorescence spectrum analysis,determined the organic matter composition in water body by parallel factor method,which was of great significance to explore the enrichment mechanism of arsenic.The results showed that the DOM in the water of Manzhouli included three components,C1 was terrestrial humic-like;C2 was semiquinone-like;C3 was microbial humic.The degree of humification in groundwater was relatively higher,and most shallow wells were organic matters of mixed source from terrestrial and microbial sources.Organic matters affect the concentration of As in groundwater in a variety of ways.The main reason was that C1 promoted the increase of soluble arsenic concentration through complexation;and C2 shuttled to enhance microbial oxidation and reduction between DOM,Fe and As.In summary,the concentrations of As in groundwater increased year by year due to the simultaneous use of endogenous organic carbon by terrestrial organisms and microorganisms.
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