[Geochemical distribution and environmental quality of cadmium in river sediment around the Jinding Pb-Zn mine area in Yunnan].
A long-term mining activity of Jinding Pb-Zn mine area in Yunnan has caused the serious cadmium pollution to the river sediments of the ambient area. The Cd contents of Beidagou river sediments (mean value <10 mg x kg(-1)) are lower than those of Nandagou river sediments (mean value = 266 mg x kg(-1)). The Cd contents of river sediments in different section of Bijiang river occur distinct difference. The Cd contents are rather lower in upstream sediments of Bijiang river, and increase substantially along downstream contaminated section of Bijiang river. The Cd pollution coefficient is higher (R = 21.9-45.2) than Zn (R = 4.9-9.7) and Pb (R = 2.7-4.6). The degree of pollution is estimated by the geoaccumulation index, which indicates the following rank of pollution elements: Cd > Zn > Pb. The river sediments are extremely contaminated in Nandagou river and downstream section of Bijiang river from Nandagou, strongly contaminated in most part of Beidagou river, moderately to strongly contaminated in few river section of Nandagou river, uncontaminated or moderately contaminated in upstream of Bijiang river from Jinding. The heavy metals pollution of river sediments presents increasing trend from Nandagou outlet to Wenzhuang section of Bijiang river.
Li
Hang
H
Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China. lihangcq@163.com
Xiao
Tang-Fu
TF
Shuang
Yan
Y
He
Li-Bin
LB
Ning
Zeng-Ping
ZP
Li
Da-Hua
DH
Zhu
Chang-Sheng
CS
D002104:Cadmium / Q000032:analysis*; D002681:China; D019015:Geologic Sediments / Q000737:chemistry*; D007854:Lead; D008906:Mining; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis*; D015032:Zinc
D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D015032:Zinc