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Persistence and fate of chlortetracycline in the aquatic environment under sub-tropical conditions: generation and dissipation of metabolites
Journal of Environmental Science and Health, Part B ( IF 2 ) Pub Date : 2020-12-30
Pamhidzai Dzomba, Mark Fungayi Zaranyika

Abstract

The persistence of chlortetracycline in the aquatic environment, including the generation and dissipation of its metabolites, were investigated over a period of 90 days using microcosm experiments, with a view to establishing the metabolites generated and their persistence under conditions closely resembling the actual aquatic environment in terms of chemical and microbial composition. The concentrations of chlortetracycline and its metabolites were monitored in the water phase as well as the sediment phase. Data are presented showing that the degradation of chlortetracycline in each phase conforms to a triphasic linear rate law, confirming the existence of three speciation forms in each phase, attributed to one free dissolved form, and two colloidal particle adsorbed forms. Data are also presented showing that the two adsorbed forms are the most persistent, with life-times of 204.1 and 20.3 days respectively in the water phase, and 215.1 and 19.8 days respectively in the sediment phase. Life-times of 5.01 and 3.7 days respectively were obtained for the free dissolved forms in the water phase and sediment phase respectively. Data are further presented showing that of the several metabolites of chlortetracycline reported previously, only 4-epi-chlortetracycline and iso-chlortetracycline could be detected, and that these two degradation products undergo microbial mineralization without transformation to other intermediate degradation products in significant or detectable amounts.



中文翻译:

亚热带条件下水环境中金霉素的持久性和命运:代谢产物的产生和消散

摘要

使用缩影实验研究了金霉素在水生环境中的持久性,包括其代谢物的产生和消散,历时90天,目的是确定在与实际水生环境非常相似的条件下产生的代谢物及其持久性。化学和微生物组成方面。在水相和沉积物相中监测金霉素及其代谢产物的浓度。数据表明,金霉素在每个相中的降解均符合三线性速率定律,证实了在每个相中存在三种形态形式,这归因于一种游离溶解形式和两种胶体颗粒吸附形式。还提供了数据,表明这两种吸附形式是最持久的,在水相中的寿命分别为204.1天和20.3天,在沉积相中的寿命为215.1天和19.8天。游离相在水相和沉积相中的寿命分别为5.01天和3.7天。进一步提供的数据表明,先前报道的金霉素的几种代谢产物中,仅能检测到4-表氯霉素和异金霉素,而且这两种降解产物都经过微生物矿化而没有转化为大量或可检测量的其他中间降解产物。 。游离相在水相和沉积相中的寿命分别为5.01天和3.7天。进一步提供的数据表明,先前报道的金霉素的几种代谢产物中,仅能检测到4-表氯霉素和异金霉素,而且这两种降解产物都经过微生物矿化而没有转化为大量或可检测量的其他中间降解产物。 。游离相在水相和沉积相中的寿命分别为5.01天和3.7天。进一步提供的数据表明,先前报道的金霉素的几种代谢产物中,仅能检测到4-表氯霉素和异金霉素,而且这两种降解产物都经过微生物矿化而没有转化为大量或可检测量的其他中间降解产物。 。

更新日期:2020-12-30
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