Freezing-Induced Bromate Reduction by Dissolved Organic Matter and the Formation of Organobromine Compounds.,Environmental Science & Technology

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Freezing-Induced Bromate Reduction by Dissolved Organic Matter and the Formation of Organobromine Compounds.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-01-23 , DOI: 10.1021/acs.est.9b07902
Zhineng Hao ₁ , Fengqiong Shi ₁ , Dong Cao ₁ , Jingfu Liu ₁ , Guibin Jiang ₁

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The freezing-induced acceleration of bromate reduction by humic substances (HS) contributes to HS bromination and the formation of organobromine compounds (OBCs). Herein, we report the enhanced reduction of bromate by dissolved organic matter and the formation of large amounts of OBCs in freezing solutions. After 48 h of freezing process, 78.1-100% of bromate was reduced by DOM at different initial concentrations of bromate and DOM in acidic solutions (pH 3 and 4). Bromide was one of the main reduction products, and it accounted for 30.9-47.8% of the total bromine content. Except for bromide, a large amount of OBCs formed by brominating DOM with reactive bromine species, like hypobromite, were detected. The conversion of bromate to OBCs, calculated as the total organobromine content to the initial bromate content, ranged from 28.2 to 52.5% and was mainly dependent on the bromate/DOM content. About 110-603 species of OBCs were detected by Fourier transform ion cyclotron resonance mass spectrometry, and they were primarily highly unsaturated and phenolic compounds. By analyzing the spectral variation before and after the freezing process, we found the disappearance of 900 compounds containing only C, H, and O with a low carbon oxidation state that was regarded as the main reductant of bromate. Our findings call for further investigation of the processes and the effects of bromate formation in aqueous environments.

中文翻译：

溶解性有机物导致的冷冻诱导的溴酸盐还原反应以及有机溴化合物的形成。

冷冻诱导的腐殖质（HS）对溴酸盐还原的加速作用促进了HS溴化和有机溴化合物（OBC）的形成。在此，我们报道了溶解的有机物增强了溴酸盐的还原，并且在冷冻溶液中形成了大量的OBC。冷冻过程48小时后，在酸性溶液（pH 3和4）中，在不同的初始溴酸盐和DOM浓度下，DOM降低了78.1-100％的溴酸盐。溴化物是主要的还原产物之一，占溴总含量的30.9-47.8％。除溴化物外，还检测到大量由诸如次溴酸盐之类的活性溴物质溴化DOM而形成的OBC。溴酸盐向OBC的转化率以总有机溴含量与初始溴酸盐含量的比率计算，范围为28.2至52。5％，主要取决于溴酸盐/ DOM含量。通过傅立叶变换离子回旋共振质谱法检测到约110-603种OBC，它们主要是高度不饱和和酚类化合物。通过分析冷冻过程前后的光谱变化，我们发现了900种仅含C，H和O的化合物的消失，这些化合物具有低碳氧化态，被认为是溴酸盐的主要还原剂。我们的发现要求进一步研究水性环境中溴酸盐的形成过程及其影响。通过分析冷冻过程前后的光谱变化，我们发现了900种仅含C，H和O的化合物的消失，这些化合物具有低碳氧化态，被认为是溴酸盐的主要还原剂。我们的发现要求进一步研究水性环境中溴酸盐的形成过程及其影响。通过分析冷冻过程前后的光谱变化，我们发现了900种仅含C，H和O的化合物的消失，这些化合物具有低碳氧化态，被认为是溴酸盐的主要还原剂。我们的发现要求进一步研究水性环境中溴酸盐的形成过程及其影响。

更新日期：2020-01-23

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