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首页> 外文期刊>The Science of the Total Environment >Dissipation of a commercial mixture of polyoxyethylene amine surfactants in aquatic outdoor microcosms: Effect of water depth and sediment organic carbon
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Dissipation of a commercial mixture of polyoxyethylene amine surfactants in aquatic outdoor microcosms: Effect of water depth and sediment organic carbon

机译：聚氧乙烯胺表面活性剂商业混合物在水生室外缩微中的消散：水深和沉积物有机碳的影响

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摘要

This study optimized existing analytical approaches and characterized the effect of sediment total organic carbon (0.05-2.05% TOC), and water depth (15, 30, and 90 cm) on the fate of M0N 0818, a commercial mixture of polyoxyethylene amine surfactants (POEAs), in outdoor microcosms. Mixtures of POEAs are commonly used as adjuvants in commercial herbicide formulations containing glyphosate. Until recently, analytical methods sensitive enough to monitor environmental concentrations of POEAs in aquatic systems were not available. After optimizing recently developed analytical methods, we found that the combined use of accelerated solvent extraction (ASE) and liquid chromatography-tandem mass spectrometry provided a reliable approach for determining the concentration of sediment-adsorbed POEAs. The surfactant showed strong affinity for sediment materials, with low maximum recoveries by ASE of 52%. Under microcosm conditions, water depth or sediment characteristics did not significantly affect the water-column half-life of POEA, which ranged from 3.2 to 5.3 h. Binding of POEAs to suspended solids was observed, which dissipated via one- or two-phase exponential decay; when two-phase decay occurred, fast phase half-life values ranged from 0.71 to 1.3 h and slow-phase values ranged from 18 to 44 h. Concentrations of POEA increased in sediment shortly after application and decreased over the study period with a half-life of 5.8 to 71 d. The concentrations of POEAs in the sediment of the shallow (15 cm) ponds dissipated following a two-phase exponential decay model with an initial fast- phase half-life of 1.1 to 8.9 d and a slower second-phase half-life of 21 d. Our results suggest that aquatic organisms are unlikely to be exposed to POEAs in aqueous phase for periods of more than a few hours following an over-water application, and that sediment is a significant sink for POEAs in aquatic systems.
机译：这项研究优化了现有的分析方法，并表征了沉积物总有机碳（0.05-2.05％TOC）和水深（15、30和90 cm）对M0N 0818的命运的影响，M0N 0818是聚氧乙烯胺表面活性剂的商业混合物（ POEAs），在室外缩影中。 POEA的混合物通常在含有草甘膦的商业除草剂配方中用作佐剂。直到最近，还没有足够灵敏的监测水生系统中POEAs环境浓度的分析方法。优化最近开发的分析方法后，我们发现加速溶剂萃取（ASE）和液相色谱-串联质谱联用为确定沉积物吸附的POEAs浓度提供了可靠的方法。表面活性剂对沉积物具有很强的亲和力，ASE的最大回收率低至52％。在微观条件下，水深或沉积物特征不会显着影响POEA的水柱半衰期，该半衰期为3.2至5.3 h。观察到POEA与悬浮固体的结合，通过一或两相指数衰减消散；当发生两相衰减时，快相半衰期值在0.71至1.3 h之间，慢相半衰期值在18至44 h之间。施用后不久，沉积物中的POEA浓度增加，在研究期间有所下降，半衰期为5.8至71 d。按照两相指数衰减模型消散浅（15 cm）池塘沉积物中的POEAs浓度，其初始快相半衰期为1.1至8.9 d，第二相半衰期较慢，为21 d 。我们的研究结果表明，水生生物在水上施用后几个小时内不太可能在水相中暴露于POEA，并且沉积物是水生系统中POEA的重要汇。

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  • 来源
    《The Science of the Total Environment》 |2016年第15期|449-458|共10页
  • 作者

    Jose Luis Rodriguez-Gil; Linda Lissemore; Keith Solomon; Mark Hanson;

  • 作者单位

    Centre for Toxicology, School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada,Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada;

    Laboratory Services Division, University of Guelph, Guelph, ON N1G 2W1, Canada;

    Centre for Toxicology, School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada;

    Department of Environment and Geography, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;

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  • 正文语种 eng
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  • 关键词

    MON0818; POEA; ANEOs; Fate; Microcosm; Sediment;

    机译：MON0818;POEA;ANEOs;命运;缩影;沉淀;

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