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Importance of Fine Particles in Pesticide Runoff from Concrete Surfaces and Its Prediction

机译：混凝土表面农药径流中细颗粒的重要性及其预测

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Pesticides such as pyrethroids have been frequently found in runoff water from urban areas and the offsite movement is a significant cause for aquatic toxiaties in urban streams and estuaries. To better understand the origination of pesticide residues in urban runoff, we investigated the association of pyrethroid residues with loose particles in runoff water from concrete surfaces after treatment with commercial products of bifenthrin and permethrin. In runoff water generated from simulated precipitations after 1 to 89 d exposure under dry outdoor conditions, over 80% of the pesticides was found on particles >0.7 μm for most treatments. The solid-water partitioning coefficient (K_d) on day 1 was estimated to be 2.4 × 10~3 to 1.1 × 10~5 L/kg for permethrin and bifenthrin on these solids. Except for solid formulations, the pesticide-laden particles likely originated from dust particles preexisting on the concrete before treatment and the disintegration of the surficial concrete matter through weathering. We consequently tested a simple sponge-wipe method to collect and analyze the loose particles on concrete. Concurrent analyses (n = 30) showed an excellent linear correlation between the amount of pesticides transferrable to runoff water and that on the wipe (R~2 = 0.78, slope = 1.13 ± 0.11, P < 0.0001). The fact that the linear relationship has a slope close to 1.0 suggests that this method may be used to predict pesticide residues available for contaminating runoff water before runoff actually occurs. The importance of loose particles should be considered when developing practices to mitigate pesticide runoff contamination from urban residential areas.
机译：农药，如拟除虫菊酯，经常在城市地区的径流水中发现，异地迁移是造成城市河流和河口水生生物的重要原因。为了更好地了解城市径流中农药残留的来源，我们研究了联苯菊酯和苄氯菊酯商品化处理后，拟除虫菊酯残留与混凝土表面径流水中的疏松颗粒之间的关系。在干燥的室外条件下暴露1至89 d后，由模拟降水产生的径流水中，大多数处理方法中，发现> 80μm的颗粒超过80％的农药。氯菊酯和联苯菊酯在第1天的固体水分配系数（K_d）估计为2.4×10〜3至1.1×10〜5 L / kg。除固体配方外，载有农药的颗粒可能源自处理前预先存在于混凝土上的粉尘颗粒，以及通过风化作用使表面混凝土物质崩解。因此，我们测试了一种简单的海绵擦拭方法来收集和分析混凝土上的松散颗粒。并行分析（n = 30）显示，可转移到径流水中的农药量与抹布上的农药量之间具有极好的线性相关性（R〜2 = 0.78，斜率= 1.13±0.11，P <0.0001）。线性关系的斜率接近1.0的事实表明，该方法可用于预测在径流实际发生之前可用于污染径流水的农药残留量。在制定减轻城市居民区农药径流污染的措施时，应考虑松散颗粒的重要性。

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  • 来源
    《Environmental Science & Technology》 |2012年第11期|p.6028-6034|共7页
  • 作者

    Weiying Jiang; Jay Gan;

  • 作者单位

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States;

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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