澳大利亚布里斯班河口沉积物中重金属的潜在生物可利用性评估、来源解析及生态风险。
Potential bioavailability assessment, source apportionment and ecological risk of heavy metals in the sediment of Brisbane River estuary, Australia.
机构信息
Queensland University of Technology (QUT), Science and Engineering Faculty, School of Chemistry, Physics and Mechanical Engineering, 2 George St, QLD 4001, Australia.
Queensland University of Technology (QUT), Science and Engineering Faculty, School of Civil Engineering and Built Environment, 2 George St, QLD 4001, Australia.
出版信息
Mar Pollut Bull. 2017 Apr 15;117(1-2):523-531. doi: 10.1016/j.marpolbul.2017.02.017. Epub 2017 Feb 12.
A weak acid extraction was used to mobilize the loosely bound metals in estuary sediment samples. More than 30% of Ag, As, Ca, Cd, Co, Cu, Hg, Mn Ni, Pb and Zn were leached from the sediment showing that these metals are significantly present in the bioavailable form. PCA/APCS identified three sources of the metals, namely: lithogenic accounting for 72%, shipping related contributing 15% and traffic related representing 13% of the total load. Application of pollution index (PI) and modified pollution index (MPI) revealed that the sediment range from unpolluted to heavily polluted while ecological risk index (RI) classifies the sediment as posing low ecological risk modified ecological risk index (MRI) suggests considerable to very high ecological risk. To provide holistic insights into the ecological risks posed by metals, enrichment factor, MPI and MRI are recommended for the assessment of sediment in complex environments such as estuaries.
采用弱酸提取的方法来提取河口沉积物样品中松散结合的金属。有超过 30%的银、砷、钙、镉、钴、铜、汞、锰、镍、铅和锌从沉积物中浸出，这表明这些金属以生物可利用的形式大量存在。主成分分析/平行因子分析确定了这些金属的三个来源，即：占 72%的岩石成因、占 15%的航运相关和占 13%的交通相关。应用污染指数（PI）和修正污染指数（MPI）表明，沉积物的污染程度从无污染到重度污染不等，而生态风险指数（RI）则将沉积物归类为低生态风险，修正生态风险指数（MRI）则表明存在相当大到非常高的生态风险。为了全面了解金属对生态的风险，在河口等复杂环境中评估沉积物时，推荐使用富集因子、MPI 和 MRI。
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