Chemical Characteristics Of Rainwater And Aerosol At Lijiang-Mt. Yulong

Lijiang-Mt. Yulong is located in Chinese southwest, the atmospheric circulation is very complex. During2008-2009, samples of rainwater and aerosol were collected at Lijiang-Mt. Yulong. The pH, electronic conductivity and main ions (Cl-, SO42-, NO3-, Ca2+, Mg2+, Na+, K+, NH4+) and δ18O have been detected, respectively.The results indicated that the pH value is higher than5.6in all precipitation samples. The total ionic concentration is dominated by SO42-and Ca2+. In Lijiang city, the ratio of SO42-and NO3-go down from52.3to2.87from2000to2009, suggesting that SO42-is being taken place by NO3-as the main pollution factor in precipitation. The vapor δ18O in precipitation can indicate the monsoon activities in the different in the source and the transmission path.On Mt. Yulong, The total ionic concentration is dominated by Ca2+, sort order of ions concentration is Ca2+>SO42->NH4+>NO3->K+>Mg2+>C1->Na+. As a whole, the ions in our samples were mainly combined as CaCO3, NH4HSO4, CaSO4, Mg(NO3)2, KNO3and a little CaSO4and (NH4)2SO4.