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Transformation of catechol coupled to redox alteration of humic acids and the effects of Cu and Fe cations.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.scitotenv.2020.138245 Xiong Jia 1 , Yujie He 2 , Philippe F-X Corvini 3 , Rong Ji 2
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.scitotenv.2020.138245 Xiong Jia 1 , Yujie He 2 , Philippe F-X Corvini 3 , Rong Ji 2
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Humic substances are reactive during redox alteration. However, the role of this reactivity in the transformation of organic compounds and in carbon cycling in the environment is still unclear. Here, we used 14C-radioactive tracer to study abiotic transformation and humification of catechol, a representative of naturally occurring monomeric phenols and phenolic pollutants, in suspensions of humic acids (HAs) at original and H2/Pd-reduced redox states with flux of air (HAorg-Air and HAred-Air, respectively) or N2 (HAorg-N2 and HAred-N2, respectively) for 20 min in absence and presence of Cu(II) and Fe(II). Both HAorg and HAred can transform catechol in the absence of O2 to 19% and 25% of the initially applied amount, respectively. The transformation of catechol strongly increased when air was introduced, amounting to 75% in HAred-Air treatment and 43% in HAorg-Air treatment, owing to the generation of reactive oxygen species. Considerable amounts of catecholic carbons were incorporated into HAs (26% for HAred-Air and 19% for HAorg-Air), constituting humification of catechol. The presence of Cu(II) strongly inhibited the overall transformation and humification of catechol, although it significantly increased humification at the start of incubation. The presence of Fe(II) overall enhanced both the transformation and humification. The results provide first insights into the impacts of redox alteration of humic substances together with the presence of metal ions with variable valences on the fate of phenolic compounds in the environment. This study points out that redox alteration-induced abiotic transformation may be one important process for dissipation of phenolic pollutants and humification of phenolic carbons in environments rich in HAs and subject to redox fluctuation.
中文翻译：
儿茶酚的转化与腐殖酸的氧化还原改变以及铜和铁阳离子的影响。
腐殖质在氧化还原改变期间具有反应性。然而，这种反应性在有机化合物的转化和环境中碳循环中的作用仍不清楚。在这里，我们使用14C放射性示踪剂研究了腐殖酸（HAs）悬浮液在原始和H2 / Pd还原氧化还原状态下随空气通量的变化，以及儿茶酚的非生物转化和腐殖化作用。 （分别为HAorg-Air和HAred-Air）或N2（分别为HAorg-N2和HAred-N2）20分钟，不存在和存在Cu（II）和Fe（II）。在没有氧气的情况下，HAorg和HAred均可将邻苯二酚转化为最初施用量的19％和25％。引入空气后，邻苯二酚的转化急剧增加，由于活性氧的产生，在HAred-Air处理中占75％，在HAorg-Air处理中占43％。HA中掺入了大量的儿茶酚碳（HAred-Air为26％，HAorg-Air为19％），构成了邻苯二酚的腐殖化。Cu（II）的存在强烈抑制了儿茶酚的整体转化和腐殖化，尽管它在孵育开始时显着增加了腐殖化。Fe（II）的存在总体上增强了转化和腐殖化作用。结果提供了对腐殖质氧化还原改变以及价态金属离子的存在对环境中酚类化合物命运的影响的初步见解。
更新日期：2020-03-27
中文翻译：
儿茶酚的转化与腐殖酸的氧化还原改变以及铜和铁阳离子的影响。
腐殖质在氧化还原改变期间具有反应性。然而，这种反应性在有机化合物的转化和环境中碳循环中的作用仍不清楚。在这里，我们使用14C放射性示踪剂研究了腐殖酸（HAs）悬浮液在原始和H2 / Pd还原氧化还原状态下随空气通量的变化，以及儿茶酚的非生物转化和腐殖化作用。 （分别为HAorg-Air和HAred-Air）或N2（分别为HAorg-N2和HAred-N2）20分钟，不存在和存在Cu（II）和Fe（II）。在没有氧气的情况下，HAorg和HAred均可将邻苯二酚转化为最初施用量的19％和25％。引入空气后，邻苯二酚的转化急剧增加，由于活性氧的产生，在HAred-Air处理中占75％，在HAorg-Air处理中占43％。HA中掺入了大量的儿茶酚碳（HAred-Air为26％，HAorg-Air为19％），构成了邻苯二酚的腐殖化。Cu（II）的存在强烈抑制了儿茶酚的整体转化和腐殖化，尽管它在孵育开始时显着增加了腐殖化。Fe（II）的存在总体上增强了转化和腐殖化作用。结果提供了对腐殖质氧化还原改变以及价态金属离子的存在对环境中酚类化合物命运的影响的初步见解。
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