Relationship between heavy metals and dissolved organic matter released from sediment by bioturbation/bioirrigation
Relationship between heavy metals and dissolved organic matter released from sediment by bioturbation/bioirrigation
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生物扰动/生物灌溉从沉积物中释放的重金属与溶解有机物之间的关系
DOI：
10.1016/j.jes.2018.03.031
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发表时间：
2019-01-01
影响因子：
6.9
通讯作者：
Wang, Dongsheng
中科院分区：
文献类型：
--
作者：
He, Yi;Men, Bin;Wang, Dongsheng
有机质是沉积物的重要组成部分。生物扰动/生物灌溉可以重新激活OM和重金属，以前埋在沉积物中。在室内实验条件下，研究了蚯蚓、摇蚊幼虫和泥鳅对沉积物中埋藏有机质、铊（Tl）、镉（Cd）、铜（Cu）和锌（Zn）的再活化作用。结果表明，生物扰动/生物灌溉促进了上覆水中溶解性有机质（DOM）和溶解性Tl、Cd、Cu、Zn的释放，但仅溶解性Zn浓度随暴露时间的延长而降低。有机物的存在改变了沉积物中DOM的组成，大大增加了富里酸类物质（FA）和胡敏酸类物质（HA）的比例。此外，生物扰动/生物灌溉加速了细菌的生长和繁殖，以提高可溶性微生物副产物样物质（SMP）的比例。三维激发发射矩阵（3D-EEM）将DOM划分为5个区域，每个区域与溶解态重金属浓度的相关性不同。溶解态Cu与各DOM组分的相关性最好，表明沉积物中Cu以有机结合态存在。此外，生物类型和重金属特性都对重金属的迁移有影响。(c)2018中国科学院生态环境科学研究中心由爱思唯尔公司出版
Organic matter (OM) is an important component of sediment. Bioturbation/bioirrigation can remobilize OM and heavy metals that were previously buried in the sediment. The remobilization of buried organic matter, thallium (Tl), cadmium (Cd), copper (Cu) and zinc (Zn) from sediment was studied in a laboratory experiment with three organisms: tubificid, chironomid larvae and loach. Results showed that bioturbation/bioirrigation promoted the release of dissolved organic matter (DOM) and dissolved Tl, Cd, Cu and Zn, but only dissolved Zn concentrations decreased with exposure time in overlying water. The presence of organisms altered the compositions of DOM released from sediment, considerably increasing the percentage of fulvic acid-like materials (FA) and humic acid-like materials (HA). In addition, bioturbation/bioirrigation accelerated the growth and reproduction of bacteria to enhance the proportion of soluble microbial byproduct-like materials (SMP). The DOM was divided into five regions in the three-dimensional excitation emission matrix (3D-EEM), and each part had different correlation with the dissolved heavy metal concentrations. Dissolved Cu had the best correlation with each of the DOM compositions, indicating that Cu in the sediment was in the organic-bound form. Furthermore, the organism type and heavy metal characteristics both played a role in influencing the remobilization of heavy metal. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.