摘要
利用ICS-90常规离子色谱结合RFC-30型淋洗液在线发生器,对贵阳市区大气降水中的小分子有机酸进行了系统研究。测得贵阳市降水中的有机酸主要以甲酸[质量分数为(0.2-4.5)×10-6]、乙酸[质量分数为(0.6-5.3)×10-6]、草酸[质量分数为(0.1-4.9)×10-6]为主,其次是乳酸和丙酮酸,及少量丙酸和甲烷磺酸;有机酸对降水自由酸平均贡献为23.2%,占总阴离子的1.4%;通过比较贵阳市区有机酸前后二十年的变化,得出现阶段可能至少有近1/2乙酸和3/4甲酸来源于人类的活动,这说明有机酸人为源是其来源的重要组成部分。
Organic acids and inorganic acids in rainwater samples from Guiyang, Southwest China were simultaneously determined by ICS-90 ion chromatography combined with a RFC-30 eluent generator. Acetate, formate and oxalate were the dominant organic acids, and lactate, pyruvate, propionate and methanesulfonate anions were detected at relatively lower levels. The average contribution of organic aicds to the free acidity of precipitation was 23.2%, and to the total anions was 1.4%. Compared to results measured 20 years ago, acetate and formate in rainwater of Guiyang possibly have at least 1/2 and 3/4 of them resulting from anthropogenic sources, respectively. This study clearly demonstrates the important impacts of anthropogenic sources on organic acids in rainwater.
出处
《地球与环境》
CAS
CSCD
北大核心
2007年第1期46-50,共5页
Earth and Environment
基金
中科院"百人计划"项目
关键词
有机酸
无机阴离子
离子色谱
ion chromatography
inorganic acids
organic acids
