Ecotoxicity of siloxane D5 in soil.
Ecotoxicity of siloxane D5 in soil.
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DOI：
10.1016/j.chemosphere.2011.11.064
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发表时间：
2012-03
期刊：
影响因子：
8.8
通讯作者：
J. Velicogna;Ellyn E Ritchie;J. Princz;Marie-Eve Lessard;R. Scroggins
中科院分区：
文献类型：
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作者：
J. Velicogna;Ellyn E Ritchie;J. Princz;Marie-Eve Lessard;R. Scroggins
十甲基环五硅氧烷（D5）是一种常见于市售产品中的环状挥发性甲基硅氧烷（cVMS）。预计D5将通过污水处理厂的生物固体存款到农田中进行营养富集而进入陆地环境。关于D5对陆地环境的风险，目前几乎没有任何信息。为了评价D5污染生物固体对陆生生物的潜在风险，采用一系列标准化土壤毒性试验评估了D5污染生物固体在农业土壤中的毒性。将D5掺入替代生物固体中，然后与桑迪壤土混合，以产生0至4074 mg kg −1的试验浓度。完成了植物（大麦（大麦）和红车轴草（红三叶草））和土壤无脊椎动物（蚯蚓（蚯蚓）和假丝酵母（跳虫））毒性测试，以评估致死和亚致死效应。植物试验评价了对出苗、芽和根长度以及芽和根干质量的影响。无脊椎动物试验终点包括成虫致死率、幼虫产量和个体幼虫干重（仅蚯蚓）。随着时间的推移收集土壤样品，以确认测试浓度并评估测试期间化学品的损失。D5的毒性是种属和终点依赖性的，因此未观察到T的显著不良反应。pratense或E. andrei试验终点，但观察到H. vulgare植物生长和F.念珠菌的生存和繁殖。在整个试验过程中，观察到高达50%的化学损失，在高浓度下最为显著。
Decamethylcyclopentasiloxane (D5) is a cyclic volatile methyl siloxane (cVMS) commonly found in commercially available products. D5 is expected to enter the terrestrial environment through the deposit of biosolids from sewage treatment plants onto agricultural fields for nutrient enrichment. Little to no information currently exists as to the risks of D5 to the terrestrial environment. In order to evaluate the potential risk to terrestrial organisms, the toxicity of a D5 contaminated biosolid in an agricultural soil was assessed with a battery of standardized soil toxicity tests. D5 was spiked into a surrogate biosolid and then mixed with a sandy loam soil to create test concentrations ranging from 0 to 4074mgkg−1. Plant (Hordeum vulgare (barley) and Trifolium pratense (red clover)) and soil invertebrates (Eisenia andrei (earthworm) and Folsomia candida (springtail)) toxicity tests were completed to assess for lethal and sub-lethal effects. Plant testing evaluated the effects on seedling emergence, shoot and root length, and shoot and root dry mass. Invertebrate test endpoints included adult lethality, juvenile production, and individual juvenile dry mass (earthworms only). Soil samples were collected over time to confirm test concentrations and evaluate the loss of chemical over the duration of a test. The toxicity of the D5 was species and endpoint dependent, such that no significant adverse effects were observed for T. pratense or E. andrei test endpoints, however, toxicity was observed for H. vulgare plant growth and F. candida survival and reproduction. Chemical losses of up to 50% were observed throughout the tests, most significantly at high concentrations.