新疆奎屯地区高砷地下水DOM三维荧光特征

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Abstract

Kuitun area in Xinjiang is the firstly reported endemic arsenic poisoning area in mainland China. Based on 3D-EEM and parallel factor analysis (PARAFAC) for high arsenic groundwater samples collected from Kuitun Xinjiang, the role of arsenic migration and transformation dissolved organic matter (DOM) characteristics and sources in the area was explored. The results indicated that the arsenic content of groundwater was in the range of 1.30~400.68μg/L, with an average of 61.18μg/L, and high arsenic groundwater accounted for 68.99% among all the samples. Three fluorescence components in the groundwater were identified as DOM including humic-like components C1 (260(325)nm/425nm),the microbial tryptophan C2 (275nm/350nm), and a humic-like (microbial reduced quinones) component C3 (260(375)nm/475nm), accounting for 2.78%, 18.74% and 54.12% respectively. The DOM fluorescence index of the water in Kuitun area was between 1.2~1.52, with a mean of 1.36, the DOM was mainly generated from terrestrial sources. The groundwater is weak alkaline-reduced environment. The release process of arsenic in groundwater is mainly the reduction of iron oxide minerals and desulfurization acid. DOM in water is involved in the reduction reaction process of iron and sulfate. The microbial tryptophan C2 acts as an electron donor during microbial respiration. The microbial reduced quinones C3 acts as an electron shuttle in the process of electron flight, enhancing the arsenic migration properties from aquifer deposits to groundwater.

Key words： Kuitun Groundwater Arsenic dissolved organic matter (DOM) three-dimensional fluorescence spectrain(3D-EEM)

Received: 16 March 2020

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X523

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	Articles by authors
	WANG Xiang
	LUO Yan-li
	DENG Wen-wen
	DAI Zhi-peng

Cite this article:

WANG Xiang,LUO Yan-li,DENG Wen-wen等. The 3D-EEM characteristics of DOM in high arsenic groundwater of Kuitun, Xinjiang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4974-4981.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I11/4974

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