Model reactions and natural occurrence of furans from hypersaline environments
Model reactions and natural occurrence of furans from hypersaline environments
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DOI：
10.5194/bg-11-2871-2014
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发表时间：
2014-01-01
期刊：
影响因子：
4.9
通讯作者：
Schoeler, H. F.
中科院分区：
文献类型：
--
作者：
Krause, T.;Tubbesing, C.;Schoeler, H. F.
挥发性有机化合物如呋喃及其衍生物对大气性质和反应很重要。在这项工作中，已知的非生物形成的呋喃从邻苯二酚在Fenton样条件下与Fe3+硫酸盐进行了修订，通过使用bispidine Fe2+络合物作为模型化合物的铁与众所周知的特性。虽然总产率与Fe 3+盐相当，但bispidine Fe 2+络合物是更好的催化剂，因为活性铁物质的周转数更高。此外，铁和pH值的作用进行了讨论，从模型化合物和天然沉积物和水样收集的死海和几个盐湖在西澳大利亚州的呋喃形成。在澳大利亚的一些样品中发现了各种烷基化呋喃，甚至微量的卤代呋喃（3-氯呋喃和3-溴呋喃）。3-在三个沉积物及四个水质样本中发现氯呋喃，而在三个水质样本中则发现3-溴呋喃。此外，排放的呋喃相比，丰富的几种可能的前体，如异戊二烯和芳烃以及相关的噻吩.据推断，挥发性有机化合物，如呋喃的排放有助于形成超微粒子在盐湖附近，是重要的当地气候。
Volatile organic compounds like furan and its derivatives are important for atmospheric properties and reactions. In this work the known abiotic formation of furan from catechol under Fenton-like conditions with Fe3+ sulfate was revised by the use of a bispidine Fe2+ complex as a model compound for iron with well-known characteristics. While total yields were comparable to those with the Fe3+ salt, the bispidine Fe2+ complex is a better catalyst as the turnover numbers of the active iron species were higher. Additionally, the role of iron and pH is discussed in relation to furan formation from model compounds and in natural sediment and water samples collected from the Dead Sea and several salt lakes in Western Australia. Various alkylated furans and even traces of halogenated furans (3-chlorofuran and 3-bromofuran) were found in some Australian samples. 3-chlorofuran was found in three sediments and four water samples, whereas 3-bromofuran was detected in three water samples. Further, the emission of furans is compared to the abundance of several possible precursors such as isoprene and aromatic hydrocarbons as well as to the related thiophenes.It is deduced that the emissions of volatile organic compounds such as furans contribute to the formation of ultrafine particles in the vicinity of salt lakes and are important for the local climate.