Triclocarban [N-(4-chlorophenyl)-N-(3,4-dichlorophenyl) urea] (TCC) is an antimicrobial agent utilized in a variety of consumer products. It is commonly released into domestic wastewaters and upon treatment, it is known to accumulate in biosolids. This study examines the occurrence of TCC in biosolids and its long-term fate in biosolid-treated soils. TCC levels in the biosolids from a large waste water treatment plant (WWTP) over 2 years showed little variability at 18,800 ± 700 ng g-1 dry wt. (mean ± SEM). Surface soil samples (top 10 cm) were collected from 26 commercial farms located in northern VA, US that had received biosolid applications from the WWTP. Samples were grouped as farms receiving no biosolids, farms with a single biosolid application, and those receiving multiple biosolid applications from 1992 to 2006. Our results illustrate that TCC soil residues remained years after biosolid application. The two most important parameters controlling TCC topsoil concentrations were the biosolid application rate and the period since the last application. No TCC removal was observed in farms where the time since biosolid application was between 7 and 9 months. TCC concentration analyzed 7 and 8 years after biosolid applications were 45.8 ± 6.1 and 72.4 ± 15.3 ng g-1 dry wt., respectively, showing its persistence in soils and build-up upon multiple biosolid applications. A soil TCC half-life of 287.5 ± 45.5 days was estimated.

译文

三氯卡班 [N-(4-氯苯基)-N-(3,4-二氯苯基) 脲] (TCC) 是用于各种消费品的抗菌剂。它通常被释放到生活废水中,并且经过处理后,已知会在生物固体中积累。这项研究研究了生物固体中TCC的发生及其在生物固体处理过的土壤中的长期命运。在过去的2年中,来自大型废水处理厂 (WWTP) 的生物固体中的TCC水平在18,800 ± 700 ng g-1干重时几乎没有变化。(平均值 ± SEM)。从位于美国弗吉尼亚州北部的26个商业农场收集了地表土壤样品 (前10厘米名),这些农场已经从WWTP获得了生物固体应用。将样品分为不接受生物固体的农场,具有单个生物固体应用的农场以及1992年2006年接受多个生物固体应用的农场。我们的结果表明,TCC土壤残留物在生物固体施用后仍然存在数年。控制TCC表土浓度的两个最重要参数是生物固体施用率和自上次施用以来的时间。自生物固体施用以来的时间在7到9个月之间的农场中未观察到TCC去除。生物固体施用后7年和8年分析的TCC浓度分别为45.8 ± 6.1和72.4 ± 15.3 ng g-1干重量,显示其在土壤中的持久性和在多种生物固体施用后的积累。估计土壤TCC半衰期为287.5 ± 45.5天。

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