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首页> 外文期刊>Environmental Science & Technology >Assessment of the geochemical role of colloids and their impact on contaminant toxicity in freshwaters: An example from the Lambro-Po system (Italy)
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Assessment of the geochemical role of colloids and their impact on contaminant toxicity in freshwaters: An example from the Lambro-Po system (Italy)

机译：评估胶体的地球化学作用及其对淡水中污染物毒性的影响：以Lambro-Po系统为例（意大利）

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摘要

The role of colloids in regulating element transport, behavior, and bioavailability in aquatic systems is now well-established. It appears that further progress in this research field is being slowed by (i) a limited integration between the geochemical and the biological aspects of the research on colloids and (ii) a persistent gap between wellcontrolled laboratory studies and real field situations. This paper presents a simultaneous evaluation of the role of colloids in controlling element environmental fate and bioavailability at the confluence between a major river and a polluted tributary. Fractionation of trace elements among suspended particulate matter, colloids, and true solution suggests that colloids may play a role in the removal of trace elements from the water column to bed sediments during the mixing of the two rivers. Toxicity testing of water samples indicates that, in this specific system, contaminants associated with colloids can contribute to water toxicity for the rotifer Brachionus calyciflorus but not for the green alga Pseudokirchneriella subcapitata. To the best of our knowledge, the results for B. calyciflorus are the first ones pointing to the possible contribution of colloid-bound contaminants to water toxicity in environmental samples. Despite the uncertainties associated with field variability,the results of chemical analysis and toxicity testing show several points of convergence. Following these observations, a few innovative research approaches are suggested to improve the understanding of trace element biogeochemistry in real field situations.
机译：胶体在调节水生系统中元素迁移，行为和生物利用度中的作用现已确立。 （i）胶体研究的地球化学和生物学方面之间的有限整合，以及（ii）受控实验室研究与实际情况之间的持续差距似乎正在减缓该研究领域的进一步进展。本文介绍了同时评估胶体在主要河流与污染支流之间汇合处在控制元素环境命运和生物利用度中的作用。悬浮颗粒物，胶体和真溶液中痕量元素的分离表明，胶体可能在两条河流混合过程中从水柱到床底沉积物的微量元素去除中发挥作用。水样品的毒性测试表明，在这种特定的系统中，与胶体相关的污染物可对轮枝Brachionus calyciflorus产生水毒性，而对绿藻次亚种Pseudokirchneriella subcapitata则没有毒性。据我们所知，花椰菜的结果是第一个指出胶体结合污染物可能对环境样品中水毒性的影响的结果。尽管存在现场可变性的不确定性，化学分析和毒性测试的结果仍显示出几个收敛点。根据这些观察结果，提出了一些创新的研究方法，以增进对实际环境中痕量元素生物地球化学的理解。

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