菏泽市水系沉积物重金属特征及风险评估

doi:10.11720/wtyht.2022.1421

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Abstract

This study aims to investigate the characteristics, pollution sources, and ecological risks of heavy metals in the stream sediments in Heze City, which is an important catchment area in the east route of the South-to-North Water Diversion Project. To this end, stream sediment samples were collected from 25 sites of three major river basins in Heze City, and the contents of Cu, Zn, Ni, Cr, Cd, and Pb in the samples were analyzed. Moreover, this study assessed the ecological risks of these heavy metal elements using the pollution load index (PLI), potential ecological risk index (RI), and logarithmic regression model and determined the pollution sources of these heavy metal elements through correlation and principal component analysis. The results are as follows. The contents of the six heavy metal elements in the stream sediment samples were generally higher than their background values. The Ni and Cd contents at all investigated sites exceeded their background values, especially the Cd content at 40% of the investigated sites, which was more than three times the background value. The heavy metals in the stream sediments of the three river basins are unevenly distributed. The maximum values of the six heavy metals all originated from the samples of the Zhuzhaoxin River basin, of which the PLI, RI, and toxicity ratio Y were 1.67, 123 and 0.367, respectively. These values were higher than those of the other two basins, indicating that the heavy metals in sediments of the Zhuzhaoxin River basin reach moderate pollution and have high ecological risks and potential harm to aquatic organisms. The principal component analysis shows that the petroleum refining and related chemical enterprises in industrial parks are the main contributors to the enrichment of the six heavy metal elements.

Key words： stream sediment heavy metal risk assessment

Received: 01 August 2021 Published: 17 August 2022

ZTFLH:

P632

Corresponding Authors: LI Min E-mail: xuxiong@hz.shandong.cn;limin428@126.com

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	Articles by authors
	Xiong XU
	Yan-Ting SUN
	Fang XIAO
	Pei-Ping XIAO
	Ying-Shang DONG
	Min LI

Cite this article:

Xiong XU,Yan-Ting SUN,Fang XIAO, et al. Characteristics and risk assessment of the heavy metals in stream sediments of Heze City[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 1021-1029.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1421 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/1021

Researched area location and distribution of sampling sites

Levels and degrees of contamination corresponding to different PLI values

The grade criteria of E_r and RI and its corresponding risk level

Intercept and slope corresponding to different heavy metals in logistic regression model

	参数	Cu	Zn	Ni	Cr	Cd	Pb
洙赵新河流域	含量范围/10^-6	32.7~53.6	52.4~120.0	31.2~61.4	52.2~139.0	0.165~0.417	20.9~44.1
	平均值/10^-6	40.2	84.4	44.5	80.3	0.269	31.1
	标准偏差/10^-6	7.5	23.5	10.9	27.6	0.078	6.2
	变异系数/%	18.6	27.9	24.5	34.3	28.9	19.9
	背景值/10^-6	24.0	63.5	25.8	66.0	0.084	25.8
	C_f值	1.68	1.33	1.72	1.22	3.20	1.20
	$E r i$ 值	8.40	1.33	8.60	2.44	96.0	6.00
	超背景值点位占比/%	100	70	100	70	100	80
万福河流域	含量范围/10^-6	15.5~41.6	62.8~87.6	27.8~57.3	54.1~92.3	0.173~0.367	22.7~37.6
	平均值/10^-6	27.4	74.2	42.9	69.3	0.254	29.9
	标准偏差/10^-6	8.7	10.5	10.2	11.5	0.079	4.9
	变异系数/%	31.8	14.2	23.7	16.5	31.0	16.3
	背景值/10^-6	24.0	63.5	25.8	66.0	0.084	25.8
	C_f值	1.14	1.17	1.66	1.05	3.02	1.16
	$E r i$ 值	5.70	1.17	8.30	2.10	90.6	5.80
	超背景值点位占比/%	62.5	87.5	100	62.5	100	75
东鱼河流域	含量范围/10^-6	18.5~48.4	55.3~108.0	28.1~59.3	51.2~94.5	0.133~0.336	20.4~41.5
	平均值/10^-6	33.3	78.3	39.2	72.9	0.212	30.4
	标准偏差/10^-6	13.0	18.3	11.0	16.1	0.070	8.6
	变异系数/%	39.1	23.4	28.1	22.1	32.8	28.1
	背景值/10^-6	24.0	63.5	25.8	66.0	0.084	25.8
	C_f值	1.39	1.23	1.52	1.11	2.53	1.18
	$E r i$ 值	6.95	1.23	7.60	2.22	75.9	5.90
	超背景值点位占比/%	57.1	71.4	100	57.1	100	57.1

Descriptive statistics of heavy metals in sediments from different rivers

Difference of heavy metals in sediments in different watersheds

Evaluation results of contamination factors of heavy metals in sediments

Evaluation results of heavy metals in sediments from different polluted rivers

Contribution of different heavy metals to potential ecological risk index

P and Y values of heavy metals in sediments from three rivers

Distribution of heavy metal contents in sediments of researched area

Correlation coefficients among heavy metal contents

Principal component analysis result of heavy metals in sediments

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