Carbon and hydrogen isotope fractionation of acetic acid during degradation by ultraviolet light
Carbon and hydrogen isotope fractionation of acetic acid during degradation by ultraviolet light
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DOI：
10.2343/geochemj.41.103
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发表时间：
2007-04
影响因子：
0.8
通讯作者：
Y. Oba;H. Naraoka
中科院分区：
文献类型：
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作者：
Y. Oba;H. Naraoka
低分子量羧酸，例如乙酸和丙酸，是碳质碳酸盐中丰富的有机化合物，并且通常富含重稳定同位素（即，13 C和D）相对于陆地有机化合物。在这项研究中，我们已经确定了碳和氢同位素分馏的乙酸，和特定地点的碳同位素分馏的乙酸，在紫外线（UV）光降解。随着UV暴露时间的增加，乙酸变得富含13 C和D。乙酸总碳、甲基碳和羧基碳的同位素分馏因子α分别为0.9922、1.0022和0.9823，氢的α值为0.9875。这些结果表明，紫外线降解可能是一个过程中产生的13 C-和D-富集的乙酸在自然环境中。
Low molecular-weight carboxylic acids, such as acetic and propionic acids, are abundant organic compounds in carbonaceous chondrites, and are generally enriched in heavy stable isotopes (i.e., 13C and D) relative to terrestrial organic compounds. In this study, we have determined carbon and hydrogen isotopic fractionation of acetic acid, and site-specific carbon isotopic fractionation of acetic acid, during degradation by ultraviolet (UV) light. Acetic acid became enriched in 13C and D with increased UV exposure times. The isotopic fractionation factors (α) of total, methyl and carboxyl carbon of acetic acid were 0.9922, 1.0022 and 0.9823 respectively, and the α value for hydrogen was 0.9875. These results suggest that UV degradation could be a process for yielding 13C- and D-enrichment of acetic acid in natural environments.