摘要
2005年12月～2006年11月在贡嘎山东坡海拔1 640 m处,利用大流量滤膜采样器对大气中的气溶胶粒子进行了分级采样,并用离子色谱(IC)分析了气溶胶中水溶性无机成分的含量.结果表明,PM2.5和PM10中总水溶性无机离子年平均浓度分别为6.46和8.86μg/m3,其中主要的3种离子SO42-、NO3-和NH4+,占PM2.5和PM10中总水溶性无机离子浓度的82%和85%.Na+、NH4+、K+、Cl-和SO42-主要分布在细粒子中,NO3-、Mg2+和Ca2+在粗细粒子中各占一半.雨季Na+与Cl-相关性明显增强,PM2.5和PM10中Na+与Cl-的相关系数R2分别为0.87和0.84.PM10中SO42-与NH4+的量浓度比值接近1∶2,表明SO42-与NH4+主要以(NH4)2SO4形式存在.
Samples of aerosol are sampled by high volume sampler from Dec. 2005 to Nov. 2006 at high altitude of 1 640 m of Gongga Mountain. Water-soluble ions in PM2.5 and PM10 are analyzed by ion chromatogram（IC）. The results shows that the annual concentrations of total water-soluble inorganic ions are respectively 6.46 and 8.86 μg/m^3 in PM25 and PM10, three major ions of SO4^2- , NO3^- and NH4 ^＋, account for respectively 82% and 85% in PM2.5 and PMl0. Na^＋ , NH4^＋ , K^＋ , Cl^- and SO4^2- were mostly distributed in fine particles, NO3^- , Mg^2＋ and Ca^2＋ occupied each one half in coast of crude and fine particles. The correlation of Na ＋ and CI^- is significantly enhanced in wet season in Gongga Mountain, the correlation coefficient R^2 are respectively 0.87 and 0.84 in PM25 and PM10. The concentration ratio of SO4^2- and NH4^＋ is approximate to 1：2 in PM10, main existence form of SO4^2- and NH4^＋ is （NH4）2SO4 at Gongga Mountain.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期9-13,共5页
Environmental Science
基金
国家重点基础研究发展规划(973)项目(2006CB403701)
国家高技术研究发展计划(863)项目(2006AA06A301)
国家杰出青年基金项目(40525016)
