Bian Bo, Zhou Yan, Zhang Qin
Jiangsu Academy of Environmental Science, Nanjing 210036, China.
Jiangsu Province Key Laboratory of Environmental Engineering, Nanjing 210036, China.
Huan Jing Ke Xue. 2017 Apr 8;38(4):1442-1450. doi: 10.13227/j.hjkx.201608078.
River sediments is a valuable environmental medium for characterizing contamination of heavy metals in the western areas of Taihu Basin and the associated risks to human health. We collected samples of typical inflow river sediments from nineteen sites during different water periods. The results showed that the concentrations of heavy metals in the river sediments followed the order of Zn > Cr > Cu > Pb > Ni > As > Cd > Hg. Compared to the background concentrations, the mean concentrations of Zn, Cd, Cu, Ni and Pb seriously exceeded the standard values. Except for As, the highest concentrations of heavy metals (Zn, Cr, Cu, Pb, Ni, Cd, Hg) were found in the samples from normal water period. The metal (Cd) presented moderate pollution degree and ecological risks,and the RI value of Cd accounted for about 47% of the total RI value. The mPEC-Q values of the sediments were in the range of 0.12-0.76, and the mean value was 0.3, indicating that the sediments in all of the sampling sites had a 15%-29% probability of toxicity. In terms of the highest value of the heavy metals, higher concentrations, I, mPEC-Q and PCA values were found at the S2 sampling sites. The results showed that effects of synergism of heavy metals pollutants on the point were found in the paper, which will provide scientific basis for control of heavy metal pollution in the Taihu Basin.
河流沉积物是表征太湖流域西部地区重金属污染及其对人类健康相关风险的一种有价值的环境介质。我们在不同水期从19个站点采集了典型入流河流沉积物样本。结果表明，河流沉积物中重金属浓度顺序为Zn＞Cr＞Cu＞Pb＞Ni＞As＞Cd＞Hg。与背景浓度相比，Zn、Cd、Cu、Ni和Pb的平均浓度严重超标。除As外，重金属（Zn、Cr、Cu、Pb、Ni、Cd、Hg）的最高浓度出现在平水期样本中。金属Cd呈现中度污染程度和生态风险，Cd的RI值约占总RI值的47%。沉积物的mPEC-Q值在0.12 - 0.76范围内，平均值为0.3，表明所有采样点的沉积物有15% - 29%的毒性概率。就重金属最高值而言，S2采样点的浓度、I、mPEC-Q和PCA值较高。结果表明本文发现了重金属污染物在该点的协同作用效应，这将为太湖流域重金属污染控制提供科学依据。
