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首页> 外文期刊>Water Research >The legacy of pesticide pollution: An overlooked factor in current risk assessments of freshwater systems
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The legacy of pesticide pollution: An overlooked factor in current risk assessments of freshwater systems

机译：农药污染的遗产：当前淡水系统风险评估中一个被忽视的因素

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We revealed a history of legacy pesticides in water and sediment samples from 19 small streams across an agricultural landscape. Dominant legacy compounds included organochlorine pesticides, such as DDT and lindane, the organophosphate chlorpyrifos and triazine herbicides such as terbutylazine and simazine which have long been banned in the EU. The highest concentrations of legacy pesticides were found in streams draining catchments with a large proportion of arable farmland suggesting that they originated from past agricultural applications. The sum of toxic units (SumTU(D.magna)) based on storm water samples from agriculturally impacted streams was significantly higher when legacy pesticides were included compared to when they were omitted. Legacy pesticides did not significantly change the predicted toxicity of water samples to algae or fish. However, pesticide concentrations in bed sediment and suspended sediment samples exceeded safety thresholds in 50% of the samples and the average contribution of legacy pesticides to the SumTU(C.riparius) Was >90%. Our results suggest that legacy pesticides can be highly significant contributors to the current toxic exposure of stream biota, especially macroinvertebrate communities, and that those communities were primarily exposed to legacy pesticides via the sediment. Additionally, our results suggest that neglecting legacy pesticides in the risk assessment of pesticides in streams may severely underestimate the risk of ecological effects. (C) 2015 Elsevier Ltd. All rights reserved.
机译：我们揭示了农业景观中19条小溪中水和沉积物样品中残留农药的历史。遗留的主要化合物包括有机氯农药（如DDT和林丹），有机磷酸盐毒死and和三嗪除草剂（如叔丁嗪和simazine），这些在欧盟早已被禁止。在有大量耕地的流域集水区中发现了最高浓度的传统农药，这表明它们起源于过去的农业应用。与遗漏的农药相比，加入遗留农药时，基于受到农业影响的河流的雨水样本得出的有毒单位总和（SumTU（D.magna））要高得多。传统农药没有明显改变水样本对藻类或鱼类的预期毒性。但是，床底沉积物和悬浮沉积物样品中的农药浓度超过了50％的安全阈值，传统农药对SumTU（R.riparius）的平均贡献大于90％。我们的结果表明，传统农药可能是导致河流生物区系当前有毒暴露的重要因素，特别是大型无脊椎动物群落，这些群落主要通过沉积物暴露于传统农药。此外，我们的结果表明，在溪流中农药的风险评估中忽略传统农药可能会严重低估了生态影响的风险。 （C）2015 Elsevier Ltd.保留所有权利。

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