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《Environmental Chemistry》 2005-02
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STRONTIUM ISOTOPE AND MAJOR ION CHEMISTRY OF THE RAINWATERS FROM GUIYANG, GUIZHOU PROVINCE,CHINA

HAN Gui-lin LIU Cong-qiang (The State Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002)  
Twenty-two rainwater samples from Guiyang areas have been analyzed for their chemical compositions and ~87 Sr/~86 Sr ratios. The rainwater from Guiyang is almost acid rain (pH=4.53) and shows big changes in major ion composition. Ca~2+ is the principal cation in the rainwater of Guiyang and its mean value is 57μ~mol·l~-1 (12—164μmol·l~-1 ), which accounts for 64%—87% of the total cations. The second major ion is Mg~2+ with the mean value as 13μmol·l~-1 (5—47μmol·l~-1 ). The sum of Ca~2+ and Mg~2+ accounts for 78%—96% of the total cations. Na~+ was the least abundant of the major cations with a mean content of 4μmol·l~-1 (1-8μmol·l~-1 ). SO~2- _~4 is the predominant of the major anions with a mean content of 94μ~mol·l~-1 (34—279μmol·l~-1 ) and accounts for 28%—94% of the total anions; coming next are NO-_~3 with a mean content of 48μmol·l~-1 (1—252 μmol·l~-1 ). SO~2- _~4 and NO~- _~3 are the major ions that determine the acidity of rainwater and their sum accounts for 77%—99% of the total anions. The Sr concentrations of rainwater in the region of Guiyang vary from 0.02 to 0.33μmol·l~-1 . The ~87 Sr/~86 Sr ratios of rainwater vary over a small range from 0.707934 to 0.709080. Compared with the ~87 Sr/~86 Sr ratios of non-sea salt sources that vary considerably from 0.707820 to 0.709078, it indicates the anthropogenic sources are predominant for the Sr in Guiyang rainwater and also maybe some rock/soil sources.
【Fund】: 国家自然科学基金(40372108);; 中国科学院创新项目(KZCX3SW140)资助.
【CateGory Index】: X142
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