大气低分子有机酸研究方法及其前沿问题
RESEARCH ON TROPOSPHERIC LOW MOLECULAR CARBOXYLIC ACIDS： ADVANCEMENT AND PROBLEMS
查看参考文献42篇
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文摘
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文章系统地阐述了大气有机酸的研究历史、现状和目前存在问题及可能取得研究进展的方法。低分子有机酸是大气中重要的微量挥发性有机碳组分，它们广泛存在于大气对流层中，对气候、环境和生态系统具有重要影响。长期以来，对大气有机酸的研究都是基于其含量的分析，尽管这一研究手段对有机酸的认识起到了推动作用，但含量的分析已越来越不能满足于当前人们对大气有机酸生物地球化学认识的需求。由于稳定同位素组成的示踪作用，近年来人们开始探索利用有机酸中碳同位素的测试分析方法来研究其循环过程。这一方法涉及水溶液中有机酸的萃取过程。由于其近发、半挥发性和其易污染性，常规的萃取方法不能应用于有机酸的萃取。最近出现的固相微萃取技术为有机酸碳同位素组成的准确分析研究提供了可能的途径。利用这一方法探索有机酸同位素组成的分析，有可能为大气有机酸生物地球化学循环研究开辟一片新的天地，从而使该领域研究向前推进一步。 |
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其他语种文摘
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Advancement and problems involved in the study of tropospheric low molecular organic acids were reviewed, possible approaches to further advancement in the subject were proposed. Low molecular organic acids, formic and acetic acids in particular, are present ubiquitously in the troposphere as trace volatile organic carbon, and play roles in changes of climate and environment, as well as in changes of chemistry in the terrestrial ecosystems. Previous studies of the organic acids were made by analyzing their concentrations in the atmospheric environment. However, more and more difficulties were encountered methodologically in making further breakthroughs in the field. Since stable isotopic composition is indicative of changes of compounds with the element, carbon isotopic signatures have been used on a trial basis to infer the biogeochemical cycles of the organic acids. The practical analytical technique, however, remains to be found. Analysis of the carbon isotopic composition of the organic acids in the atmospheric samples, which are usually in the form of water solution, involves extraction of the organic compounds from the water matrix. Due to the volatile and semi-volatile properties, and thus their susceptibility to contamination from the ambient air in the laboratory, the organic acids are practically difficult to extract with the conventional techniques such as the liquid-liquid extraction and the solid extraction. Solid phase microextraction that has been invented in recent years provides a reasonable avenue to the contamination-free extraction. Once the extraction from the water solution is done, the compounds can then be transferred to a Gas Chromatograph coupled with Isotope Ratio Mass Spectrometer for measurement of the isotopic composition. |
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来源
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地球与环境
,2008,36(1):1-7 【核心库】
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关键词
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甲酸
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乙酸
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生物有机酸
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挥发性有机碳（VOC）
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碳同位素
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固相微萃取
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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1672-9250 |
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学科
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地质学;环境科学基础理论 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:3259736
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