重庆黔江区大气降水的化学特征及来源分析  

Analysis on the Chemical Characteristics and Origin of Atmospheric Precipitation in Qianjiang District of Chongqing City

作　　者：龚立[1] 揭芳芳 刘兰玉[1] 安贝贝[1] 

机构地区：[1]重庆市环境监测中心,重庆401147 [2]重庆化工职业学院,重庆400021

出　　处：《环境监测管理与技术》2015年第3期37-40,共4页The Administration and Technique of Environmental Monitoring

基　　金：环保公益性行业科研专项基金资助项目(201009001)

摘　　要：通过2013年6月—2014年5月对黔江区大气降水的化学组成分析研究表明，降水样品的 pH 值分布范围在4．91～7．32之间；SO4-2是降水中主要的阴离子，占阴离子总量的68．9％，Ca2＋是降水中含量较高的阳离子，占阳离子总量的41．4％；SO4-2／NO3 -浓度比为6．78，表明降水类型为硫酸盐型。陆源性离子 Ca2＋、Mg2＋以及海源性离子 Na ＋和 Cl －之间存在明显的相关关系。海水和土壤的富集系数表明，研究区域的 SO4-2和 NO3-主要归因于人为活动的影响。Comprehensive studies of the chemical composition of atmospheric precipitation were from June 201 3 to May 201 4 in Qianjiang district of Chongqing city.pH of precipitation events ranged from 4.91 to 7.32. SO4 -2 was the main anion,accounting for 68.9% of the total mass measured anions in precipitation.Ca2 ＋ was the main cation,accounting for 41 .4% of the total cations.The mean concentration ratio for SO4 -2 /NO 3- was 6.78, indicating that the rain pollutants was sulphate.Significant correlations were found between soil-derived species Ca2 ＋ and Mg2 ＋and sea-salt species between Na ＋ and Cl -.Enrichment factors of marine and soil indicated that SO4 -2 and NO3 - is mostly attributed to the anthropogenic activities.

关 键 词：大气降水 化学特征 来源 富集系数 

分 类 号：X517[环境科学与工程—环境工程]