Mobilization of soil-bound residue of organochlorine pesticides and polycyclic aromatic hydrocarbons in an in vitro gastrointestinal model.
Mobilization of soil-bound residue of organochlorine pesticides and polycyclic aromatic hydrocarbons in an in vitro gastrointestinal model.
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DOI：
10.1021/es1025849
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发表时间：
2011-02-01
影响因子：
11.4
通讯作者：
Liu, Wenxin
中科院分区：
文献类型：
--
作者：
Tao, Shu;Li, Li;Ding, Junnan;Zhong, Junjun;Zhang, Diyu;Lu, Yan;Yang, Yifeng;Wang, Xilong;Li, Xiqing;Cao, Jun;Lu, Xiaoxia;Liu, Wenxin
以前的一项研究，从外地污染土壤中的有机氯农药（OCPs）的动员显示，在消化液和食糜的体外胃肠道模型中测量的OCPs的总量高于直接提取的数量使用溶剂提取没有消化，提供了一个线索，结合残留的OCPs可能被动员。在这项研究中，OCPs和多环芳烃（PAHs）的这一假设进行了测试。从野外采集了3个不同有机碳含量的污染表层土壤样品，采用消化法和非消化法对样品进行了提取。结果表明，有机氯农药和多环芳烃的结合残留物在消化过程中有一定程度的移动。对于单个化合物，消化后提取的总量（Rb）中动员的结合残留物的比例从0到0.96不等。Rb与OC含量呈正相关。在消化液的五种成分中，胆汁盐是唯一一种用于动员结合残留物的成分，并且胆汁盐的可提取性在2至20 mg/mL的浓度范围内是恒定的。活化过程遵循典型的一级动力学。计算的速率常数表明，动员是快速和90%的提取绑定残留物的OCPs和多环芳烃被动员在2.4和4.8小时内，分别。
A previous study on mobilization of organochlorine pesticides (OCPs) in contaminated soils from the field revealed that the total amount of OCPs measured in digestive fluid and chyme of an in-vitro gastrointestinal model was higher than the quantity directly extracted using a solvent extraction without digestion, providing a clue that the bound residue of OCPs might be mobilized. This hypothesis was tested in this study for both OCPs and polycyclic aromatic hydrocarbons (PAHs). Three contaminated surface soil samples with different organic carbon (OC) contents were collected from the field, and extracted with a solvent with and without digestion in an in-vitro gastrointestinal model. It was found that bound residues of OCPs and PAHs were mobilized to a certain extent during digestion. The ratios of the mobilized bound residues over the total quantities extracted after digestion (Rb) varied from 0 to 0.96 for individual compounds. The Rb was positively correlated with OC content. Among the five constitutes of digestive juice, bile salt was the only one that served to mobilize the bound residues and the extractability of bile salt was constant over a concentration range from 2 to 20 mg/mL. The mobilization process followed typical first-order kinetics. The calculated rate constants suggest that mobilization was fast and 90% of extracted bound residues of OCPs and PAHs were mobilized within 2.4 and 4.8 h, respectively.
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DOI：
10.1007/s00244-002-1278-0
发表时间：
2003-04-01
影响因子：
4
作者：
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通讯作者：
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影响因子：
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FREED, VH
影响因子：
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Michaelis, W