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Methyl bromide production from dissolved organic matter under simulated sunlight irradiation and the important effect of ferric ions.
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-01-31 , DOI: 10.1039/c9em00473d Hui Liu 1 , Tong Tong , Yingying Pu , Xiaomei Zhu , Bing Sun , Zhaowei Wang , Zhiyu Yan
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-01-31 , DOI: 10.1039/c9em00473d Hui Liu 1 , Tong Tong , Yingying Pu , Xiaomei Zhu , Bing Sun , Zhaowei Wang , Zhiyu Yan
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The oceans play an important role in the biogeochemical cycle of methyl bromide (CH3Br), as not only the sinks but also the sources. However, many uncertainties exist regarding the way of CH3Br generation in the marine environment. To illustrate the possibility of photochemical formation of CH3Br in saline water, its generation in bromide aqueous solution containing humic acid (HA) and ferric ions (Fe(iii)) was investigated. CH3Br was obviously generated after irradiation, and its amounts increased with increasing HA concentration from 0.82 to 12.2 mgC L-1. Fe(iii) significantly promoted CH3Br production, and the described production process in the presence of Fe(iii) was pH-dependent, decreasing with the increase of pH. Finally, the concentrations of CH3Br in natural coastal seawater and seawater with HA were measured, and the results showed that CH3Br was significantly generated under irradiation. Our results suggest that the photochemical process of dissolved organic matter may be one source of CH3Br in the marine environment.
中文翻译：
在模拟阳光照射下由溶解的有机物生产甲基溴和三价铁离子的重要作用。
海洋在甲基溴（CH3Br）的生物地球化学循环中起着重要作用，不仅是汇，而且是源。但是，在海洋环境中，CH3Br的生成方式存在许多不确定性。为了说明在盐水中光化学形成CH3Br的可能性，研究了在含有腐殖酸（HA）和三价铁离子（Fe（iii））的溴化物水溶液中生成CH3Br的可能性。CH3Br明显是在辐射后产生的，并且其含量随着HA浓度从0.82 mgC L-1增加而增加。Fe（iii）显着促进了CH3Br的产生，并且在Fe（iii）存在的情况下，上述生产过程是pH依赖性的，随pH的增加而降低。最后，测量了天然沿海海水和含HA的海水中CH3Br的浓度，结果表明，在辐射下CH3Br明显生成。我们的结果表明，溶解有机物的光化学过程可能是海洋环境中CH3Br的一种来源。
更新日期：2020-01-31
中文翻译：
在模拟阳光照射下由溶解的有机物生产甲基溴和三价铁离子的重要作用。
海洋在甲基溴（CH3Br）的生物地球化学循环中起着重要作用，不仅是汇，而且是源。但是，在海洋环境中，CH3Br的生成方式存在许多不确定性。为了说明在盐水中光化学形成CH3Br的可能性，研究了在含有腐殖酸（HA）和三价铁离子（Fe（iii））的溴化物水溶液中生成CH3Br的可能性。CH3Br明显是在辐射后产生的，并且其含量随着HA浓度从0.82 mgC L-1增加而增加。Fe（iii）显着促进了CH3Br的产生，并且在Fe（iii）存在的情况下，上述生产过程是pH依赖性的，随pH的增加而降低。最后，测量了天然沿海海水和含HA的海水中CH3Br的浓度，结果表明，在辐射下CH3Br明显生成。我们的结果表明，溶解有机物的光化学过程可能是海洋环境中CH3Br的一种来源。
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