The environmental fate and persistence of sulfoxaflor is of significant interest given the potential for the insecticide to impact nontarget organisms, particularly pollinating and aquatic species. In the present study we examine the potential for sulfoxaflor, a new sulfoximine insecticide, to undergo degradation and transformation in sediments and the aquatic environment. Following application of the active substance as a foliar spray or seed coating, sulfoxaflor can be found in the soil at a mass percentage of up to 61% of the total applied concentration. The low soil sorption coefficient (K_D) of sulfoxaflor of 0.103 signifies the potential for sulfoxaflor to undergo transport into nearby surface waters via groundwater run-off. In soils and sediments sulfoxaflor produces a sulfoxaflor-urea analog with a varying half-life of 5.0 to 8.5 d depending on the sediment type. Once in surface waters, sulfoxaflor can undergo photolysis to a sulfoxaflor alcohol derivative with a half-life of 35 h. The photodegradate demonstrates reduced aquatic toxicity to Daphnia magna, but the photolytic half-life may be too long to mitigate the acute toxicity of the parent substance sulfoxaflor to D. magna, which was found to have a 48-h median effect concentration of 361 µg/L. Environ Toxicol Chem 2021;40:2156–2164. © 2021 SETAC

中文翻译：

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亚砜亚胺杀虫剂 Sulfoxaflor 及其光降解产物对非目标无脊椎动物 Daphnia magna 具有急性毒性

鉴于杀虫剂可能影响非目标生物，特别是授粉和水生物种，因此对环境归宿和磺胺嘧啶的持久性具有重要意义。在本研究中，我们研究了新的亚砜亚胺杀虫剂 sulfoxaflor 在沉积物和水生环境中发生降解和转化的潜力。在将活性物质作为叶面喷雾或种子包衣施用后，可以在土壤中发现磺胺嘧啶，其质量百分比高达总施用浓度的 61%。低土壤吸附系数（K _D) 0.103 的磺胺嘧啶表明磺胺嘧啶有可能通过地下水径流进入附近的地表水。在土壤和沉积物中，磺胺嘧啶可产生一种具有 5.0 至 8.5 天不同半衰期的磺草胺-尿素类似物，具体取决于沉积物类型。一旦进入地表水中，磺胺嘧啶可以光解成半衰期为 35 小时的磺胺醇衍生物。光降解产物对大型水蚤的水生毒性降低，但光解半衰期可能太长，无法减轻母体磺胺嘧啶对D. magna的急性毒性，发现其 48 小时的中位效应浓度为 361 µg /L。环境毒物化学2021；40:2156–2164。© 2021 SETAC