img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2000, Vol. 22 ›› Issue (3): 270-277.

• 研究论文 • 上一篇    下一篇

生物有机酸的来源及其测试分析方法

李心清, 秦大河, 任贾文, 周会   

  1. 中国科学院寒区旱区环境与工程研究所冰芯与寒区环境开放研究实验室, 甘肃兰州730000
  • 收稿日期:1999-09-01 修回日期:1999-12-15 出版日期:2000-08-25 发布日期:2012-04-26
  • 基金资助:
    中国科学院"九五"重大项目(KZ951-A1-402-03);国家自然科学基金项目(49871022);中国科学院兰州冰川冻土研究所天山冰川观测试验站站长基金和中国博士后基金会博士后基金的资助

Organic Acids: A Review for Their Sources and Measurements

LI Xin-qing(LEE Xinqing), QIN Da-he, REN Jia-wen, ZHOU Hui   

  1. Laboratory of Ice Core and Cord Regions Environment, CAREERI, CAS, Lanzhou Gansu 730000 China
  • Received:1999-09-01 Revised:1999-12-15 Online:2000-08-25 Published:2012-04-26

摘要: 对目前生物有机酸的来源及其测试分析方法研究现状进行了评述.目前已知的生物有机酸的来源有植物生长过程中的直接释放、有机物质的燃烧、机动车辆燃油的尾气排放、稀烃等不饱和有机物的大气氧化、人类生产和生活对大气环境的污染以及甲酸蚁社会活动过程中的释放等等.有机酸来源的一个判别指标是甲酸/乙酸比值的大小与人类活动有关的来源中,甲酸/乙酸比值<1,而自然源的两者比值>1要准确地测定降水中生物有机酸的含量必须考虑有机酸的易挥发、易污染及低含量等特性不同样品中生物有机酸的定量测定虽然原理相同,但由于其离子组成的差异,因而出现了针对不同样品的测试分析方法目前较好的有机酸测试分析方法可使其分析误差降低到3%~5%左右.

关键词: 有机酸, 降水:雪冰, 色谱仪, 人类污染

Abstract: Current studies on organic acid sources and determination methods are reviewed. The sources include emissions from vegetation, biomass burning, automobile exhaust. oxidation in the atmosphere of alkenes and other hydrocarbons. anthropogenic pollution as well as emission of formicine ants. The ratio of formic to acetic is employed to identify the sources of organic acids. The ratio is less than 1 for the organic acid sources relating to human activities. Whereas it will be larger than 1 for natural sources. Determination of organic acids has to face the hurdles from the acid’s volatility. contamination susceptibility and trace concentration. Although the analyzing principles are common. analyzing methods are different for different samples that have different anionic components, owing to the difference in ion exchange columns, eluent solution and working conditions for separation of anions. The detection limit for organic acids depends not only on the instrument and analytical conditions. but also on the specific species and its concentration. The detection limits of formic and fluoride are lower than that of acetic and MSA. Similarly. analytical errors also dependent on instrument. analytical method. species to be determined and its concentration, as well as its detection limit. Corresponding to their detection limits. the analytic uncertainties for formic and fluoride are lower than that for acetic and MSA. At present the best method enables the analytical error lower than about 3%-5% for organic acids.

Key words: Organic acids, precipitation, snow and ice, ion chromatography, anthropogenic pollution

中图分类号: 

  • P343.6