[Observation and analysis on water-soluble inorganic chemical compositions of atmospheric aerosol in Gongga Mountain].

Samples of aerosol are sampled by high volume sampler from Dec. 2005 to Nov. 2006 at high altitude of 1640 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 microg/m3 in PM2.5 and PM10, three major ions of SO4(2-), NO3-; and NH4+, account for respectively 82% and 85% in PM2.5 and PM10, Na+, NH4+, K+, Cl- and SO4(2-) were mostly distributed in fine particles, NO3-, Mg2+ and Ca2+ occupied each one half in coast of crude and fine particles. The correlation of Na+ and Cl- is significantly enhanced in wet season in Gongga Mountain, the correlation coefficient R2 are respectively 0.87 and 0.84 in PM2.5 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+ (NH4)2SO4 at Gongga Mountain.