Ecological Risk Assessment of Lead Pollution in the Sediments of the Daliao River Watersystem of China
Lead is an extremely toxic metal and may cause neural poisoning at low concentration in environment. Thus, it has become one of the hotspots of research. Daliao River watersystem was polluted by the lead discharge from chemical industries and mines of around cities. The objective of this study was to evaluate the potential ecological risk using the calculated background concentration of lead. Total concentration of Pb, Sc and major elements (Al, Fe, Mg, Ca, K and Na) in the sediment was measured by atomic fluorescence spectrometer, ICP-MS, and ICP-OES, respectively, following digestion of the sediment with various acids. The background concentrations of lead in the surface sediments were reconstructed employing conservatives element Sc. The calculated concentrations of lead in the sediments ranged between 14.72 mg/kg and 25.06 mg/kg. Enrichment ratios and potential ecological risk index of lead in the sediment of the Daliao River watersystem were calculated, according to reconstructed background concentrations of lead. Lead in the sediments of some branch streams and sites around industrial cities might cause very strong ecological risk, while at most sites it might cause moderate or might not cause ecological risk. The methodology used in this study might assess more accurately the ecological risk of Pb in the sediment, compared to previous methods using maximal concentration of lead in the global sediment before industrialization or the average concentration in the sediment of China mainland.
Daliao River Pb sediment ecological risk pollution
FAN Yinghong LIN Chunye HE Mengchang YANG Zhifeng ZHOU Yuxiang
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）