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首页> 外文期刊>Environmental toxicology and chemistry >Benzidine transformation processes in natural sediments.
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Benzidine transformation processes in natural sediments.

机译：天然沉积物中的联苯胺转化过程。

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摘要

Aromatic amines, such as benzidine and 3,3'-dichlorobenzidine, are chemicals used in the pigment and dye processes. Release of these compounds into the environment is important because of their carcinogenic and toxic nature. In the present study, the sediment and water samples were collected from Lake Macatawa (Holland, MI, USA) and subsequently spiked with benzidine. The grain size distribution of the sediment samples investigated here ranged in composition from sandy to silty-clay sediment types. The sediment-water systems spiked with benzidine were incubated under anaerobic conditions at 4, 15, and 23 degrees C for 211 d. Degradation of benzidine was observed over the time-course analysis of the sediment-water mixtures. Three possible metabolites (aniline, 2-ethyl-1-hexanol, and 1-amino-2-hexene) were observed during this investigation as a result of gas chromatography/mass spectrometry and liquid chromatography/mass spectrometry. No metabolites were observed in autoclaved bottles, suggesting that the transformation of benzidine in the sediment-water mixtures was the result of microbial activity. From sediment-water distribution experiments, benzidine demonstrated higher sorption affinity for the different sediment phases than its degradation product, aniline. Therefore, microbially mediated transformation of benzidine to aniline is expected to yield a greater total concentration of the more mobile compound, aniline, in the water phase and a greater possibility for transport of aniline in the water phase.
机译：芳香胺，例如联苯胺和3,3'-二氯联苯胺，是用于颜料和染料加工的化学物质。由于这些化合物的致癌和毒性性质，将其释放到环境中很重要。在本研究中，沉积物和水样品是从Macatawa湖（美国密歇根州的荷兰）收集的，然后加有联苯胺。此处研究的沉积物样品的粒度分布范围从沙质到粉质粘土沉积物类型不等。将掺有联苯胺的沉积物-水系统在厌氧条件下于4、15和23摄氏度孵育211 d。在沉积物-水混合物的时间过程分析中观察到联苯胺的降解。由于气相色谱/质谱和液相色谱/质谱的结果，在此研究过程中观察到三种可能的代谢物（苯胺，2-乙基-1-己醇和1-氨基-2-己烯）。在高压灭菌瓶中未观察到代谢物，表明在沉积物-水混合物中联苯胺的转化是微生物活性的结果。根据沉积物-水分布实验，联苯胺对不同沉积物相的吸附亲和力高于其降解产物苯胺。因此，预期在水相中微生物介导的联苯胺向苯胺的转化将产生更高浓度的更具流动性的化合物苯胺，并且在水相中运输苯胺的可能性更大。

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