Wu Chenxi, Spongberg Alison L, Witter Jason D
Department of Environmental Sciences, University of Toledo, Toledo, Ohio 43606, USA.
J Agric Food Chem. 2009 Jun 10;57(11):4900-5. doi: 10.1021/jf900376c.
Triclosan and triclocarban are antibacterial agents that are widely used in numerous personal care products. Limited information is available on their environmental behavior in soils and soils land applied with wastewaters and biosolids. In this study, laboratory experiments were performed to investigate their adsorption and degradation in soils. Both antibacterial agents adsorbed strongly to the sandy loam and silty clay soils with and without addition of biosolids, with distribution coefficients (K(d)) ranging from 178 to 264 L kg(-1) for triclosan and from 763 to 1187 L kg(-1) for triclocarban. Sorption of triclosan decreased with increase in soil pH from 4 to 8, whereas triclocarban sorption showed no effect within the tested pH range. Competitive sorption was observed when triclosan and triclocarban coexisted, but the cosolute effect was concentration dependent. Biosolids amendment increased the sorption of triclosan and triclocarban, likely due to the addition of soil organic matter, but displayed no significant effect on degradation.
三氯生和三氯卡班是抗菌剂，广泛应用于众多个人护理产品中。关于它们在土壤以及施用废水和生物固体的土壤中的环境行为，现有信息有限。在本研究中，进行了实验室实验以研究它们在土壤中的吸附和降解情况。这两种抗菌剂在添加和未添加生物固体的砂壤土和粉质粘土中均有强烈吸附，三氯生的分配系数（K(d)）范围为178至264 L kg(-1)，三氯卡班的分配系数范围为763至1187 L kg(-1)。随着土壤pH值从4增加到8，三氯生的吸附量降低，而在测试的pH范围内，三氯卡班的吸附量没有变化。当三氯生和三氯卡班共存时，观察到竞争吸附，但共溶质效应取决于浓度。添加生物固体增加了三氯生和三氯卡班的吸附，这可能是由于土壤有机质的增加，但对降解没有显著影响。
