云南省镇雄县土壤重金属污染及潜在生态风险评估

doi:10.11720/wtyht.2019.0214

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Abstract

Based on the current evaluation standards of soil environmental quality and food safety, the authors used the single factor index method, Nemero composite index method and Hakanson potential ecological hazard index method to carry out soil heavy metal pollution and potential ecological risk assessment so as to find out the environmental risk level and spatial distribution characteristics of soil heavy metal pollution in the study area. The results of Nemero composite index evaluation indicate that high pollution occurs in the study area, and the proportion of slight pollution , moderate pollution and high pollution is respectively 39.03%, 16.62% and 28.57%. However, the potential ecological risk of Cu, Hg, As, Ni, Pb, Cr, Zn is low in soil in eight heavy metals, while the level of risk of Cd is higher, and the proportion of the samples with low, medium, slight, high, seriously potential risk is 17.71%, 17.71%, 22.77%, 12.31% and 8.00%, with the average of potential ecological harm index ( $E r i$ )being 118.24. The sites of high and higher potential ecological hazard of Cd in the soil are mainly located in the Lower Permian stratigraphic unit. Meanwhile, the heavy metal evaluation of 45 corn seeds shows that only one corn seed has excessive Cd content, and there is no obvious correlation between the content of Cd in corn seeds and the corresponding crop root soil. The high content of Cd seems mainly affected by geological background, but has no influence on corn seeds in the study area,and the risk of the absorption and enrichment of Cd by crops is higher with the increase of the soluble Cd content in a highly acidic soil environment.

Key words： soil pollution heavy metal risk evaluation Hakanson index geochemical characteristics

Received: 15 April 2019 Published: 28 November 2019

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	Articles by authors
	Ya-Long ZHOU
	Zhi-Juan GUO
	Cheng-Wen WANG
	Jie CHEN
	Min PENG
	Hang-Xin CHENG

Cite this article:

Ya-Long ZHOU,Zhi-Juan GUO,Cheng-Wen WANG, et al. Assessment of heavy metal pollution and potential ecological risks of soils in Zhenxiong County,Yunnan Province[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1358-1366.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0214 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1358

Classification and expression of heavy metal environmental quality in soil

Statistics on the number of samples of geochemical grade evaluation of heavy metal elements in the study area %

Single factor pollution index evaluation map of Cd in soil in study area

Box plot of Cd content of soil heavy metal of different geological units in the survey area

Evaluation map of nemero composite index of soil in study area

指标等级	一等	二等	三等	四等	五等	$E r i$ 特征值
危害程度	低	中	较高	高	严重	平均值	最大值	最小值	中位数
$E r i$ 指数	$E r i$ <40	40≤ $E r i$ <80	80≤ $E r i$ <160	160≤ $E r i$ <320	$E r i$ ≥320	平均值	最大值	最小值	中位数
As	100.00	0	0	0	0	3.92	21.17	0.40	3.42
Cd	17.71	39.21	22.77	12.31	8.00	118.24	2515.00	5.90	70.30
Cr	100.00	0	0	0	0	1.55	5.69	0.51	1.35
Cu	100.00	0	0	0	0	5.37	27.80	0.74	3.51
Hg	99.91	0.09	0	0	0	4.79	227.79	0.49	4.16
Ni	100.00	0	0	0	0	3.27	37.17	0.33	2.60
Pb	100.00	0.09	0	0	0	3.09	401.91	0.49	2.60
Zn	100.00	0.04	0	0	0	0.74	250.63	0.12	0.56

Statistics on the number of samples of potential ecological hazard index of single factor of soil heavy metal elements%

Evaluation map of soil potential ecological hazard index in study area

Statistical table of analysis results of corn seed samples in study area

Evaluation map of Cd of heavy metal in corn seed samples in study area

Statistical table of correlation analysis of heavy metal elements in crop-root soil in the study area(N=45)

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