Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways.
Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways.
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连续缺氧-好氧培养过程中水稻土中四溴双酚 A 的降解：动力学、代谢物和潜在途径
DOI：
10.1038/s41598-018-31723-9
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发表时间：
2018-09-07
影响因子：
4.6
通讯作者：
Hou M
中科院分区：
文献类型：
--
作者：
Wei G;Zhao H;Huang D;Hou M
随着四溴双酚A（TBBPA）在水稻土中污染程度的日益严重，研究其在反复缺氧-好氧条件下的降解规律具有重要意义。本研究对TBBPA的降解（动力学、代谢产物和潜在途径）以及低分子量有机酸（即，在连续缺氧-好氧培养过程中研究了水稻土中乳酸。在缺氧条件下，非灭菌土壤中的TBBPA被有效地脱溴为三溴双酚A（tri-BBPA）、二溴双酚A（di-BBPA）和单溴双酚A（mono-BBPA）三种中间产物和双酚A（BPA），速率常数（k）为0.0371 d− 1，半衰期（t1/2）为60.8 d。脱溴终产物（BPA）稳定积累。接下来，转向好氧条件下，厌氧积累的BPA迅速降解，而中间体和TBBPA从结合的残留物中解吸，并且是持久的。检测到三-BBPA，然后是二-BBPA和单-BBPA，表明TBBPA的脱卤可能是溴原子的逐步去除。TBBPA的降解途径为TBBPA → tri-BBPA → di-BBPA → mono-BBPA → BPA。TBBPA及其代谢产物的降解是生物介导的。此外，乳酸作为外源碳源和电子供体可显著促进TBBPA的生物降解，使k增大至0.0766 d− 1，t1/2缩短至31.9 d.这些信息将提高我们对与农艺措施（如施用有机肥）相关的生物过程的理解，这些生物过程有助于自然土壤环境中TBBPA的衰减。
Due to the increasing pollution of tetrabromobisphenol A (TBBPA) in paddy soils, it is of great importance to explore the degradation of TBBPA under repeated anoxic-oxic conditions. In the present study, the degradation of TBBPA (kinetics, metabolites and potential pathways) and the influence of low molecular weight organic acid i.e., lactic acid were investigated in a paddy soil during sequential anoxic-oxic incubations. Under the anoxic condition, TBBPA in the non-sterile soils was efficiently debrominated into three intermediates (including tri-BBPA, di-BBPA and mono-BBPA) and bisphenol A (BPA) with a rate constant (k) of 0.0371 d−1and a half-life (t1/2) of 60.8 d. The debromination end product (BPA) steadily accumulated. Next, turning to the oxic conditions, the anaerobically accumulated BPA degraded rapidly, while the intermediates and TBBPA were desorbed from the bound residues and were persistent. The detection of tri-BBPA followed by di-BBPA and mono-BBPA thereafter indicated that the dehalogenation of TBBPA was likely a stepwise removal of bromine atoms. A pathway of TBBPA → tri-BBPA → di-BBPA → mono-BBPA → BPA was thus proposed for TBBPA degradation. The degradation of TBBPA and its metabolites was biologically mediated. Moreover, the biodegradation of TBBPA could be significantly accelerated by the addition of lactic acid as an exogenous carbon source and electron donor, withkbeing increased to 0.0766 d−1andt1/2being shortened to 31.9 d. The information will improve our understanding of biotic process associated with agronomic practices (such as applying organic fertilizers) contributing to TBBPA attenuation in the natural soil environment.
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