Abstract:This study analyzed the concentrations of cation and anion, and pH in precipitation taken in Guiyang throughout one year from October 1, 2008 to September 30, 2009. Using the software-TrajStat to simulate backward trajectory of air mass, we examined the source of ions and impact factors on ion concentrations. The results indicated that the volume-weighted average of pH in one year was 4.23. SO42- was the major anion and volume-weighted average was 265.63μeq·L-1, accounting for 87.19% of total anions. And Ca2+ and NH4+ were the major cations and their volume-weighted means were 182.90μeq/L and 112.79μeq/L, accounting for 47.10% and 29.05% of total cations, respectively. Good correlations between NH4+, Ca2+ and SO42- were observed, which imply the (NH4)2SO4, NH4HSO4 and CaSO4 being exist in the atmosphere in Guiyang. Significant seasonal variations in total ion concentration, as high in winter and low in summer, showed that the ion concentration was affected by many factors such as precipitation amount and pollutant sources. Enrichment factor relative to seawater and soil indicated that Ca2+, Mg2+ and K+ were mainly from crustal source, but SO42- and NO3- from the anthropogenic source. The backward trajectories in Guiyang showed that the air mass from various directions in spring, from sea in summer, and from northeastern inland in autumn and winter.
肖红伟, 肖化云, 王燕丽. 贵阳大气降水化学特征及来源分析[J]. 中国环境科学, 2010, 30(12): 1590-1596.
XIAO Hong-Wei, XIAO Hua-Yun, WANG Yan-Li. Chemical characteristics and source apportionment of precipitation in Guiyang.. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(12): 1590-1596.