EFFECTS OF TRICLOSAN ON SOIL MICROBIAL RESPIRATION
EFFECTS OF TRICLOSAN ON SOIL MICROBIAL RESPIRATION
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DOI：
10.1002/etc.405
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发表时间：
2011-02-01
影响因子：
4.1
通讯作者：
van Egmond, Roger
中科院分区：
文献类型：
--
作者：
Butler, Emma;Whelan, Michael J.;van Egmond, Roger
抗菌物质三氯生广泛用于个人护理产品，如果将污水污泥施用于土壤，则可能进入陆地环境。研究了三氯生对三种不同土壤的基础呼吸和基质诱导呼吸的抑制作用。对土壤进行了四种标称三氯生浓度的给药和再给药，并测量了随时间推移的呼吸速率。在每种土壤中，在初始给药后，观察到基础呼吸显著下降，随后恢复。呼吸抑制的初始程度与三氯生剂量呈正相关，即，在三氯生浓度最高时，呼吸受到最大抑制。等效剂量下土壤之间呼吸抑制的差异与有机质和粘土含量呈负相关，这表明三氯生的生物利用度可能因有机碳的吸附或微孔中的物理保护而降低。底物诱导的呼吸也减少了三氯生的加入，随后恢复。三氯生再给药后，所有土壤的基础呼吸都增强了，这表明三氯生是一种基质。然而，在所有三种土壤中，当三氯生剂量超过10 mg kg（-1）时，再给药导致SIR抑制，尽管所有土壤似乎比初始给药后更能抵抗扰动。目前的研究表明，三氯生抑制土壤呼吸，但随后发生的微生物群落的驯化。Environ.毒理学. 2011;30：360-366。(C)2010年SETAC
The antimicrobial substance triclosan has widespread use in personal care products and can enter the terrestrial environment if sewage sludge is applied to soil. The inhibitory effects of triclosan on basal and substrate-induced respiration (SIR) of three different soils were investigated. Soils were dosed and later redosed with four nominal triclosan concentrations, and respiration rates were measured over time. In each soil, a significant depression in basal respiration was noted after initial dosing, followed by a recovery. The initial extent of respiration inhibition was positively related to the triclosan dose, i.e., respiration was most inhibited at highest triclosan concentration. Differences in respiration inhibition between soils at equivalent dose were inversely correlated with organic matter and clay content, suggesting that the bioavailability of triclosan might have been reduced by sorption to organic carbon or by physical protection in micropores. Substrate-induced respiration was also reduced by the addition of triclosan and subsequently recovered. After redosing with triclosan, basal respiration was enhanced in all soils, suggesting that it was acting as a substrate. However, redosing resulted in SIR inhibition in all treatments above 10 mg triclosan kg(-1) in all three soils, although all soils appeared to be more resistant to perturbation than following initial dosing. The present study suggests that triclosan inhibits soil respiration but that a subsequent acclimation of the microbial community occurs. Environ. Toxicol. Chem. 2011;30:360-366. (C) 2010 SETAC