Chemical Characteristic and Source Assessment of Wet Precipitation at Huangpu District,Guangzhou

The chemical characteristic of wet precipitation at Huangpu District of Guangzhou was studied on the basis of monitoring data in 2006.The rainwater was typically acidic with pH value ranged from 3.56 to 6.41.94.6%,and the rainfall-weighted average of 4.44.The percent contribution to anions for SO2-4 and NO-3 were 50.6% and 29.8%,respectively.Ca2+ was the highest concentration among the total cations with a contribution of 52.6%,while NH+4 presented 30.5%.Nearly 67.6% of the acidity of rainwater was neutralized by main alkaline cations,Ca2+ and NH+4.Furthermore,enrichment factors of major ions were computed to assess possible sources of major ions.The results showed that SO2-4 and NO-3 were from anthropogenic activities,while Ca2+ and K+from crustal sources.