矿区家庭谷物和豆类重金属含量特征及风险评价

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Abstract

A total of 179cereal and beans samples from three villages around a mining area in Southwest China were collected to evaluate the pollution and health risk of heavy metals by the consumption of cereal and beans. Heavy metals including Pb, Cr, Cd, As and Hg in samples were analyzed. The Nemerow composite pollution index was applied to evaluate the quality of the cereal and beans. The Target Hazard Quotient was used to assess the potential health risks of heavy metals to adults via the consumption of cereal and beans in the mining area. The results indicated that the concentrations of Pb, Cr, Cd, As and Hg in rice samples were 0.01~0.67mg/kg, 0.01~1.50mg/kg, 0.02~3.05mg/kg, 0.04~0.20mg/kg, and 0.15~63.27μg/kg, respectively. The pollution of Cd in rice samples was more serious than other heavy metals, which showed the exceeded standard rate of 70.4%. The mean concentrations of Cd in rice samples from A, B and C villages were 3.0, 1.3 and 3.8 times higher than the limitation value in foods. The concentrations of Pb, Cr, Cd, As and Hg in soybean samples were 0.11~0.85mg/kg, 0.03~1.05mg/kg, 0.01~1.02mg/kg, 0.01~0.20mg/kg, and 0.15~24.22μg/kg, respectively. The pollution of Pb and Cd in soybean samples were more serious than other heavy metals, with the exceeded standard rate of 97.4% and 74.4%, respectively. The mean concentrations of Pb in soybean samples from A, B and C villages were 2.5, 2.0 and 2.5times higher than the limitation value in foods. And the mean concentrations of Cd in soybean samples from A, B and C villages were 1.8, 1.8 and 1.5times higher than the limitation value in foods. The concentrations of Pb, Cr, Cd, As and Hg in corn samples were 0.08~0.49mg/kg, 0.03~0.77mg/kg, 0.003~0.27mg/kg, 0.01~0.16mg/kg, and 0.15~16.10μg/kg, respectively. Among the five metal, Pb had the highest exceeded standard rate of 52.0%. The mean concentrations of Pb in corn samples from A and B villages were 1.0 and 1.3 times higher than the limitation value in foods. The composite pollution index indicated that heavy metal pollution of corn in A and B villages were at risk level, while rice in A and C villages were moderately contaminated, and others are slightly contaminated. Health risk assessment showed that the risk to adults via consumption of rice in three villages were mainly contributed by Cr, Cd and As.

Key words： heavy metal risk assessment cereal and beans southwest of China

Received: 31 May 2016

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	Articles by authors
	HUANG Chu-shan
	HU Guo-cheng
	CHEN Mian-biao
	ZHANG Li-juan
	QIU Rong-liang

Cite this article:

HUANG Chu-shan,HU Guo-cheng,CHEN Mian-biao等. Heavy metal content characteristics and risk assessment of household cereal and beans from mining areas[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1171-1178.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/1171

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