典型城市河流底泥溶解性有机质与重金属响应机制研究

朱宁美; 崔兵; 刘东萍; 于会彬; 高红杰; 郑昭佩

doi:10.12153/j.issn.1674-991X.20210093

典型城市河流底泥溶解性有机质与重金属响应机制研究

doi: 10.12153/j.issn.1674-991X.20210093

朱宁美^1,2,,
崔兵^1,2,
刘东萍²,
于会彬^2,*, ,,
高红杰²,
郑昭佩¹

1.
山东师范大学地理与环境学院
2.
中国环境科学研究院流域水污染综合治理中心

详细信息

作者简介:
朱宁美(1997—),女,硕士研究生,主要从事水土资源利用与生态修复研究, znm19854191250@163.com

通讯作者:
于会彬 E-mail: yhbybx@163.com

中图分类号: X522
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出版历程
- 收稿日期: 2021-03-27
- 刊出日期: 2021-11-20

Response mechanism of dissolved organic matter and heavy metals in sediments of typical urban rivers

ZHU Ningmei^{1,2
,},
CUI Bing^1,2,
LIU Dongping²,
YU Huibin^{2,*
, ,},
GAO Hongjie²,
ZHENG Zhaopei¹

1.
College of Geography and Environment, Shandong Normal University
2.
Watershed Research Center for Comprehensive Treatment of Water Environmental Pollution, Chinese Research Academy of Environmental Sciences

More Information

Corresponding author: YU Huibin E-mail: yhbybx@163.com

摘要

摘要: 应用三维荧光光谱(EEMs)结合平行因子(PARAFAC)分析、典范对应分析(CCA)和结构方程模型(SEM),以沈阳市建城区黄泥河、新开河、满堂河为研究对象,测定河流底泥营养盐和重金属浓度,检测溶解性有机质(DOM)三维荧光光谱,研究城市河流底泥DOM与重金属响应机制。总氮(TN)和总磷(TP)的平均浓度均为新开河>黄泥河>满堂河,TP平均浓度均大于650 mg/kg,根据US EPA底泥分类标准属于重度污染。基于相关性分析,黄泥河Cu、Ni、Cr具有同源性,新开河As、Cd和Hg具有同源性,满堂河As和Zn具有同源性。基于PARAFAC分析,DOM含有5个荧光组分,即陆源类腐殖质(C1)、类富里酸(C2和C3)、类胡敏酸(C4)和类色氨酸(C5)。C1的丰度占总丰度的30.31%,C2和C3占37.76%,显示陆源类腐殖质和类富里酸为DOM的主要组分。黄泥河与新开河DOM受外源影响较大,而满堂河受内源影响较大。CCA分析表明:C3、C5、Cr和Pb是影响黄泥河底泥的特征因子,Hg是影响新开河底泥的特征因子,TP、As和Zn是影响满堂河底泥的特征因子。基于SEM分析,TN、TP、C1、C2、C3和C5对重金属的权重分别为25.46%、22.16%、17.52%、15.42%、9.11%和10.33%,表明TN和TP是3条河底泥重金属的主要影响因子。营养盐对重金属的路径系数为-0.18,重金属对Hg、As、Zn、Cd路径系数分别为-2.83、-1.69、-1.91和-3.24,表明它们具有同源性;此外,DOM与重金属路径系数为0.11,重金属对Pb和Cr的路径系数为1.58和1.00,表明DOM与Pb和Cr具有同源性。
- 重金属 /
- 溶解性有机质 /
- 平行因子分析 /
- 典范对应分析 /
- 结构方程模型
Abstract: Three-dimensional fluorescence spectroscopy, combined with parallel factor (PARAFAC) analysis, canonical correspondence analysis (CCA), and structural equation model (SEM), was applied to measure the concentrations of the heavy metals and nutrients, detect the three-dimensional fluorescence spectra of dissolved organic matter (DOM), and study the response mechanism of DOM and heavy metals in urban river sediment. Surface sediment samples were collected from Huangnihe River, Xinkaihe River and Mantanghe River in Shenyang City. The average concentration of total nitrogen (TN) was ordered as Xinkaihe River>Huangnihe River>Mantanghe River, so was total phosphorus (TP). TP average concentrations were higher than 650 mg/kg in the three rivers, which attributed to heavy polluted status. According to the correlation analysis, Cu, Ni and Cr were homologous in Huangnihe River, As, Cd and Hg were homologous in Xinkaihe River, and As and Zn were homologous in Mantanghe River. Based on PARAFAC analysis, five fluorescent components were extracted from DOM in the three rivers, namely, terrestrial humus (C1), fulvic-like (C2 and C3), humic-like (C4), tryptophan-like (C5), among which the abundance of C1 accounted for 30.31% of the total abundance, and C2 and C3 accounted for 37.76%. Obviously, terrestrial humus and fulvic-like were the main components of DOM. DOM in Huangnihe River and Xinkaihe River were deeply affected by the allochthonous, while DOM in Mantanghe River by the autochthonous. Based on CCA, C3, C5, Cr and Pb were the characteristic factors affecting Huangnihe River sediment, Hg was the important factor affecting Xinkaihe River sediment, and TP, As and Zn were the characteristic factors affecting Mantanghe River sediment. Based on SEM analysis, the weights of TN, TP, C1, C2, C3 and C5 to heavy metals was 25.46%, 22.16%, 17.52%, 15.42%, 9.11% and 10.33%, respectively, indicating that TN and TP were the main influencing factors of the heavy metals. The path coefficient of the nutrients was -0.18 for the heavy metals, whose path coefficients for Hg, As, Zn and Cd were -2.83, -1.69, -1.91 and -3.24 respectively, which indicated that the nutrients had homology with Hg, As, Zn and Cd. Furthermore, the path coefficient of DOM was 0.11 for the heavy metals, whose path coefficients for Pb and Cr were 1.58 and 1.00, which suggested that DOM had homology with Pb and Cr.
- heavy metal /
- dissolved organic matter (DOM) /
- parallel factor (PARAFAC) analysis /
- canonical correspondence analysis (CCA) /
- structural equation model (SEM)

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