Toxic heavy metal contamination assessment and speciation in sugarcane soil

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Wang, Xiaofei^1,2 ; Deng, Chaobing^1,2 ; Yin, Juan^1 ; Tang, Xiang^1

Light Industry and Food Engineering College, Guangxi University, Nanning

530004, China^1

Guangxi Zhuang Autonomous Region Environmental Monitoring Center, Nanning

530028, China^2

关键词: Environmental risks;    Heavy metal pollution;    Heavy metal speciation;    Inductive coupled plasma mass spectrometries;    Mean concentrations;    Pollution level;    Residual fraction;    Toxic heavy metals;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042059/pdf
DOI  :  10.1088/1755-1315/108/4/042059

来源: IOP

【 摘 要 】

The increasing heavy metal pollution in the sugarcane soils along the Great Huanjiang River was caused by leakage and spills of Lead (Pb) and Zinc (Zn) tailing dams during a flood event. Copper (Cu), Zn, Pb, Cadmium (Cd), and Arsenic (As) concentrations of soil samples collected from 16 different sites along the Great Huanjiang River coast typical pollution area were analyzed by Inductive Coupled Plasma Mass Spectrometry (ICP-MS). The mean concentrations of Pb, Cd, Zn, Cu, and As in the sugarcane soils were 151.57 mg/kg, 0.33 mg/kg, 155.52 mg/kg, 14.19 mg/kg, and 18.74 mg/kg, respectively. Results from the analysis of heavy metal speciation distribution showed that Cu, Zn, Pb, and Cd existed in weak acid, reducible, and oxidizable fractions, and the sum of these fractions accounted for significant proportions in sugarcane soils. However, the residual fraction of As with high proportion of reducible fraction indicated that this trace element still poses some environmental risk in the sugarcane soils because of its high content. Assessments of pollution levels revealed that the highest environmental risk was arouse by Pb. In addition, moderate to strong Cd and Zn pollution were found, while As has zero to medium level of pollution and Cu has zero level.