Department of Environmental Science and Technology, School of Applied Sciences, Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, UK.
Environ Pollut. 2012 Aug;167:101-9. doi: 10.1016/j.envpol.2012.03.036. Epub 2012 May 5.
The anti-microbial substance triclosan can partition to sewage sludge during wastewater treatment and subsequently transfer to soil when applied to land. Here, we describe the fate of triclosan in a one-year plot experiment on three different soils receiving sludge. Triclosan and methyl-triclosan concentrations were measured in soil samples collected monthly from three depths. A large fraction of triclosan loss appeared to be explained by transformation to methyl-triclosan. After 12 months less than 20% of the initial triclosan was recovered from each soil. However, the majority was recovered as methyl-triclosan. Most of the chemical recovered at the end of the experiment (both triclosan and methyl-triclosan) was still in the top 10 cm layer, although there was translocation to lower soil horizons in all three soils. Between 16.5 and 50.6% of the applied triclosan was unaccounted for after 12 months either as a consequence of degradation or the formation of non-extractable residues.
在废水处理过程中，抗菌物质三氯生会分配到污水污泥中，然后当施用于土地时会转移到土壤中。在这里，我们描述了三氯生在三种不同土壤上为期一年的田间实验中的命运，这些土壤接收了污泥。每月从三个深度采集土壤样本，测量土壤样品中的三氯生和甲基三氯生浓度。大量的三氯生损失似乎是由于转化为甲基三氯生而造成的。12 个月后，从每种土壤中回收的初始三氯生不到 20%。然而，大部分以甲基三氯生的形式回收。实验结束时回收的大部分化学物质（三氯生和甲基三氯生）仍在顶部 10 厘米的土层中，尽管在所有三种土壤中都有向较深土壤层的转移。12 个月后，有 16.5%至 50.6%的施用量的三氯生由于降解或形成不可提取的残留物而无法解释。
