论文摘要
Metallic ore mining causes heavy metal pollution worldwide. However, the fate of heavy metals in agrosystems with long-term contamination has been poorly studied. Dongchuan District（Yunnan, southwest China）,located at the middle reaches of the Xiaojiang River, is a well-known 2000-year-old copper mining site. In this work, a survey on soil heavy metal contents was conducted using a handheld X-ray fluorescence instrument to understand the general contamination of heavy metals in the Xiaojiang River Basin. Furthermore, river water, soil, and rice samples at six sites along the fluvial/alluvial fans of the river were collected and analyzed to implement an environmental assessment and an evaluation of irrigated agrosystem. V, Zn, and Cu soil levels(1724, 1047, and696 mg·kg-1, respectively) far exceeded background levels. The geo-accumulation indexes（Igeo） showed that cultivated soils near the mining sites were polluted by Cd and Cu, followed by Zn, V, Pb, Cr, Ni, and U. The pollution index（Pi） indicated that rice in the area was heavily polluted with Pb, Cr, Cd, Ni, Zn, and Cu. The difference in orders of metal concentrations between the soil and rice heavy metal contamination was related to the proportion of bioavailable heavy metals in the soil. The crop consumption risk assessment showed that the hazard quotient exceeded the safe threshold, indicating a potential carcinogenic risk to consumers. The Nemerow integrated pollution index and health index indicated that the middle of the river（near the mining area） was the heaviest polluted site.
论文目录
文章来源
类型: 期刊论文
作者: Wanqiu Pu,Jiaqi Sun,Fangfang Zhang,Xingyue Wen,Wenhu Liu,Chengmin Huang
来源: Acta Geochimica 2019年05期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 矿业工程,环境科学与资源利用
单位: Department of Environmental Science and Engineering,Sichuan University,College of Resources and Environment, Northwest A&F University,College of Land and Resources, China West Normal University
基金: funded by National Key Research and Development Program of China (Grant No. 2017YFC0504902),National Key Technology R&D Program of China (Grant No. 2012BAC06B02)
分类号: X753
页码: 753-773
总页数: 21
文件大小: 1871K
下载量: 16