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Kinetics of Decomposition of Thiocyanate in Natural Aquatic Systems
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acs.est.7b04723 Irina Kurashova 1 , Itay Halevy 2 , Alexey Kamyshny 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acs.est.7b04723 Irina Kurashova 1 , Itay Halevy 2 , Alexey Kamyshny 1
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Rates of thiocyanate degradation were measured in waters and sediments of marine and limnic systems under various redox conditions, oxic, anoxic (nonsulfidic, nonferruginous, nonmanganous), ferruginous, sulfidic, and manganous, for up to 200-day period at micromolar concentrations of thiocyanate. The decomposition rates in natural aquatic systems were found to be controlled by microbial processes under both oxic and anoxic conditions. The Michaelis–Menten model was applied for description of the decomposition kinetics. The decomposition rate in the sediments was found to be higher than in the water samples. Under oxic conditions, thiocyanate degradation was faster than under anaerobic conditions. In the presence of hydrogen sulfide, the decomposition rate increased compared to anoxic nonsulfidic conditions, whereas in the presence of iron(II) or manganese(II), the rate decreased. Depending on environmental conditions, half-lives of thiocyanate in sediments and water columns were in the ranges of hours to few dozens of days, and from days to years, respectively. Application of kinetic parameters presented in this research allows estimation of rates of thiocyanate cycling and its concentrations in the Archean ocean.
中文翻译：
自然水生系统中硫氰酸酯的分解动力学
在微摩尔浓度的硫氰酸盐下，在长达200天的时间内，测量了各种氧化还原条件（含氧，无氧（非硫，非铁，非锰），铁，硫和锰）在海洋和石灰岩系统的水和沉积物中硫氰酸盐的降解速率。 。发现在有氧和无氧条件下，自然水生系统中的分解速率均受微生物过程控制。Michaelis-Menten模型用于描述分解动力学。发现沉积物中的分解速率高于水样品中的分解速率。在有氧条件下，硫氰酸盐的降解速度比在无氧条件下要快。在存在硫化氢的情况下，与缺氧的非硫化条件相比，分解速率有所提高，而在铁（II）或锰（II）的存在下，速率降低。根据环境条件，硫氰酸盐在沉积物和水柱中的半衰期分别为数小时至数十天，以及数天至数年。这项研究中提供的动力学参数的应用可以估算太古代海洋中硫氰酸盐循环的速率及其浓度。
更新日期：2018-01-18
中文翻译：
自然水生系统中硫氰酸酯的分解动力学
在微摩尔浓度的硫氰酸盐下，在长达200天的时间内，测量了各种氧化还原条件（含氧，无氧（非硫，非铁，非锰），铁，硫和锰）在海洋和石灰岩系统的水和沉积物中硫氰酸盐的降解速率。 。发现在有氧和无氧条件下，自然水生系统中的分解速率均受微生物过程控制。Michaelis-Menten模型用于描述分解动力学。发现沉积物中的分解速率高于水样品中的分解速率。在有氧条件下，硫氰酸盐的降解速度比在无氧条件下要快。在存在硫化氢的情况下，与缺氧的非硫化条件相比，分解速率有所提高，而在铁（II）或锰（II）的存在下，速率降低。根据环境条件，硫氰酸盐在沉积物和水柱中的半衰期分别为数小时至数十天，以及数天至数年。这项研究中提供的动力学参数的应用可以估算太古代海洋中硫氰酸盐循环的速率及其浓度。
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