Impact of biosolids on the persistence and dissipation pathways of triclosan and triclocarban in an agricultural soil
Impact of biosolids on the persistence and dissipation pathways of triclosan and triclocarban in an agricultural soil
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DOI：
10.1016/j.scitotenv.2009.08.003
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发表时间：
2009-11-15
影响因子：
9.8
通讯作者：
Topp, Edward
中科院分区：
文献类型：
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作者：
Al-Rajab, Abdul Jabbar;Sabourin, Lyne;Topp, Edward
广谱抗菌剂三氯生（TCS）和三氯卡班（TCC）广泛用于许多个人护理产品。关于这两种化合物在不同环境基质中的命运的知识很少。在这项研究中，TCS和TCC在土壤中的命运后，直接添加，或当残留物通过液体市政生物固体（LMB）或脱水市政生物固体（DMB）进行了研究，在实验室耗散实验和室外条件下使用放射性同位素方法。在实验室培养中，将C-14-TCC或C-14-TCS添加到含有壤土的微宇宙中，并在30 ℃下培养期间测定（CO2）-C-14积累和溶剂可提取的C-14损失的速率。与TCC或TCS直接添加到土壤中相比，两种化学品在LMB中施用时矿化更快，而在DMB中施用时矿化更慢。施用基质对可提取残留物的去除率没有影响。在田间实验中，将母体化合物直接掺入土壤中，通过LMB掺入，或将经修正的DMB的单一聚集体施用于土壤表面。在实验期间，土壤温度从20摄氏度到10摄氏度不等。在野外的消散比在实验室的实验中慢得多。在LMB存在下，不可提取残留物的去除速度比其他处理快。可提取和不可提取残留物的回收表明，14摄氏度的大气损失很少。三氯卡班很容易与DMB形成不可提取的残留物，而TCS则不会。总的来说。这项研究已经确定，当这些化学品被携带在生物固体中时，与当这些化学品被直接添加到土壤中时相比，TCS和TCC在土壤中消散的途径和动力学是不同的。皇冠版权所有（C）2009年出版的爱思唯尔B. V.保留所有权利。
The broad spectrum antimicrobial agents triclosan (TCS) and triclocarban (TCC) are widely used in many personal care products. Knowledge concerning the fate of these two compounds in different environmental matrices is scarce. In this study, the fate of TCS and TCC in soil following direct addition, or when residues were applied via either liquid municipal biosolids (LMB) or dewatered municipal biosolids (DMB) was investigated in laboratory dissipation experiments and under outdoor conditions using radioisotope methods. In laboratory incubations, C-14-TCC or C-14-TCS was added to microcosms containing a loam soil and the rate of (CO2)-C-14 accumulation and loss of solvent-extractable C-14 were determined during incubation at 30 degrees C. Compared to when TCC or TCS was added directly to soil, both chemicals were mineralized more rapidly when applied in LMB, and both were mineralized more slowly when applied in DMB. The application matrix had no effect on the rate of removal of extractable residues. In field experiments, parent compounds were incorporated directly in soil, incorporated via LMB, or a single aggregate of amended DMB was applied to the soil surface. During the experiment soil temperatures ranged from 20 degrees C to 10 degrees C. Dissipation was much slower in the field than in the laboratory experiments. Removal of non-extractable residues was faster in the presence of LMB than the other treatments. Recovery of extractable and non-extractable residues suggested that there was little atmospheric loss of 14 degrees C. Triclocarban readily formed non-extractable residues with DMB whereas TCS did not. Overall. this study has identified that both the pathways and the kinetics of TCS and TCC dissipation in soil are different when the chemicals are carried in biosolids compared to when these chemicals are added directly to the soil. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.