Heavy metal contamination and potential ecological risk for sediments in the Puyang River Basin prior to and post dredging
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摘要: 为全面了解浙江省浦阳江流域浦江县城区段疏浚前后底泥沉积物中重金属含量及其潜在生态危害程度，在浦阳江干流及5条支流共采集24个底泥样品，以及生态清淤站的64个样本，测试了砷（As），铬（Cr），镍（Ni），铜（Cu），锌（Zn），铅（Pb）等6种重金属元素，并结合数据与地理信息系统（GIS）制图，比较各河段的污染情况，采用地积累指数法和潜在生态危害指数法对浦阳江流域疏浚前后重金属污染进行分析和评价。结果表明：浦阳江流域底泥在疏浚后，重金属质量分数与疏浚前有了明显下降，普遍下降了1~2倍，但各样点重金属质量分数还是普遍高于当地的土壤重金属背景值；各种重金属污染对浦阳江流域构成的潜在生态危害由强至弱依次为：砷＞铅＞铜＞镍＞铬＞锌，其中砷的影响占绝对主导地位；从综合污染程度分析，浦阳江干流的污染程度最低，支流中西溪的污染程度最高，为中等生态危害；砷的富集可能与浦江县水晶玻璃生产有关。图2表5参17Abstract: Using 25 sediment specimen samples from five tributaries of the Puyang River as well as samples from 64 ecological dredging stations, heavy metal concentrations and their potential ecological risks to the sediments prior to and post dredging were determined. Elements As, Cr, Ni, Cu, Zn, and Pb were analyzed, and then data was plotted based on GIS to compare the pollution levels of different reaches. The index of geo-accumulation and the potential ecological risk index were employed to evaluate the pollution level of heavy metals in the sediments. Results showed that compared to before dredging, after dredging the heavy metal content had decreased one or two times. The potential ecological risk intensity caused by different metals was: As ＞ Pb ＞ Cu ＞ Ni ＞ Cr ＞ Zn. Analysis for degree of comprehensive pollution showed that Xixi River had the most pollution among the tributaries; Puyang River had the lowest pollution and was rated a medium ecological hazard. After dredging, there is still the accumulation of heavy metals, the major pollutants is As. ［Ch, 2 fig. 5 tab. 17 ref.］
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Key words:
- environmental sciences /
- sediment /
- heavy metal contamination /
- Puyang River Basin /
- dredge /
- ecological risk
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2016.01.005
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