[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 PM_(2.5) and PM_(10) 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 PM_(2.5) and PM_(10),three major ions of SO~(2-)_4,NO~-_3 and NH~+_4,account for respectively 82% and 85% in PM_(2.5) and PM_(10).Na~+,NH~+_4, K~+,Cl~-and SO~(2-)_4 were mostly distributed in fine particles,NO~-_3,Mg~(2+) and Ca~(2+) 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 R~2 are respectively 0.87 and 0.84 in PM_(2.5) and PM_(10).The concentration ratio of SO~(2-)_4 and NH~+_4 is approximate to 1∶2 in PM_(10),main existence form of SO~(2-)_4 and NH~+_4 is(NH_4)_2SO_4 at Gongga Mountain.