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Interaction and coexistence characteristics of dissolved organic matter with toxic metals and pesticides in shallow groundwater

文献类型： 外文期刊

作者： He, Xiao-Song 1 ; Zhang, Ya-Li 3 ; Liu, Zhen-Hai 4 ; Wei, Dan 6 ; Liang, Gang 6 ; Liu, Hong-Tao 3 ; Xi, Bei-Dou 1 ; Huang 1 ;

作者机构： 1.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

2.Chinese Res Inst Environm Sci, State Environm Protect Key Lab Simulat & Control, Beijing 100012, Peoples R China

3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China

4.Naikai Univ, Coll Environm Sci & Engn, Tianjin 300350, Peoples R China

5.China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China

6.Beijing Acad Agr & Forestry Sci, Beijing 100097, Peoples R China

7.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

关键词： Dissolved organic matter; Groundwater; Toxic metals; Pesticide

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 258 卷

页码：

收录情况： SCI

摘要： The long-term and large-scale utilization of fertilizers and pesticides in facility agriculture leads to groundwater pollution. However, the coexistence and interactions between organic fertilizers (i.e., organic matter), toxic metals, and pesticides in shallow groundwater have seldom been studied. Thus, the study sought to characterize said interactions via fluorescence, ultraviolet-visible spectroscopy (UV-Vis), and Fourier-transform infrared spectroscopy coupled with two-dimensional correlation spectroscopy and chemometric techniques. The results indicated that groundwater DOM was comprised of protein-, polysaccharide-, and lignin-like substances derived from organic fertilizers. Protein-like substances accounted for the binding of Co, Ni, and Fe, while polysaccharide- and lignin-like substances were mainly responsible for Cr and Mo complexation. Moreover, lignin- and polysaccharide-like substances played a key role in the binding of pesticides (i.e., dichlorodiphenyltrichloroethane endosulfan, gamma-hexachlorocyclohexane [gamma-HCH], monocrotophos, chlorpyrifos, and chlorfenvinphos), rendering the conversion of gamma-HCH to beta-hexachlorocyclohexane (beta-HCH) and the degradation of DDT to dichlorobenzene dichloroethylene (DDE) ineffective. However, the presence of protein-like substances in groundwater benefited the degradation and conversion of gamma-HCH and alpha-endosulfan. Redundancy analyses showed that lignin- and polysaccharide-like matter had the most impacts on the coexistence of DOM with toxic metals and pesticides. (C) 2019 Elsevier Ltd. All rights reserved.

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