Triclocarban (TCC) toxicity and bioaccumulation data are primarily limited to direct human and animal dermal exposures, animal ingestion exposures to neat and feed-spiked TCC, and/or aquatic organism exposures. Three non-human, terrestrial organism groups anticipated to be the most highly exposed to land-applied, biosolids-borne TCC are soil microbes, earthworms, and plants. The three ecological receptors are expected to be at particular risk due to unique modes of exposure (e.g. constant, direct contact with soil; uptake of amended soil and pore water), inherently greater sensitivity to environmental contaminants (e.g. increased body burdens, permeable membranes), and susceptibility to minute changes in the soil environment. The toxicities of biosolids-borne TCC to Eisenia fetida earthworms and soil microbial communities were characterized using adaptations of the USEPA Office of Prevention, Pesticides, and Toxic Substances (OPPTS) Guidelines 850.6200 (Earthworm Subchronic Toxicity Test) and 850.5100 (Soil Microbial Community Toxicity Test), respectively. The resultant calculated TCC LC50 value for E. fetida was 40 mg TCC kg amended fine sand(-1). Biosolids-borne TCC in an amended fine sand had no significant effect on soil microbial community respiration, ammonification, or nitrification. Bioaccumulation of biosolids-borne TCC by E. fetida and Paspulum notatum was measured to characterize potential biosolids-borne TCC movement through the food chain. Dry-weight TCC bioaccumulation factor (BAF) values in E. fetida and P. notatum ranged from 5.2-18 and 0.00041-0.007 (gsoil gtissue(-1)), respectively.

译文

三氯卡班 (TCC) 毒性和生物蓄积数据主要限于直接的人类和动物皮肤暴露,动物摄入的纯净和加饲料的TCC暴露,和/或水生生物暴露。土壤微生物,earth和植物预计最容易暴露于土地上的生物固体传播的TCC的三个非人类陆地生物群体是土壤微生物,earth和植物。由于独特的暴露模式 (例如,与土壤的持续直接接触; 吸收改良的土壤和孔隙水),对环境污染物的固有敏感性更高 (例如,身体负担增加,渗透膜),以及对土壤环境微小变化的敏感性。利用美国环保局预防、农药和有毒物质办公室 (OPPTS) 指南850.6200 (蚯蚓亚慢性毒性试验) 和850.5100 (土壤微生物群落毒性试验),分别对生物固体传播的TCC对Eisenia fetida蚯蚓和土壤微生物群落的毒性进行了表征。所得的fetida的TCC LC50值为40 mg TCC kg修正细砂 (-1)。改良细沙中生物固体传播的TCC对土壤微生物群落的呼吸,氨化或硝化作用没有显着影响。测量了E. fetida和Paspulum notatum对生物固体传播的TCC的生物累积,以表征生物固体传播的TCC在食物链中的潜在运动。E. fetida和P. notatum的干重TCC生物累积因子 (BAF) 值分别为5.2-18和0.00041-0.007 (gsoil gsit组织 (-1))。

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