Acid rain and alkalization in southwestern China: chemical and strontium isotope evidence in rainwater from Guiyang | |
Guilin Han; Qixin Wu; Yang Tang | |
2012 | |
Source Publication | Journal of Atmospheric Chemistry
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Volume | 68Issue:2Pages:139-155 |
Abstract | A comprehensive study on the chemical compositions of rainwater was carried out from June 2007 to December 2008 in Guiyang, a city located on the acid rain control zone of southwest China. All samples were analyzed for pH, major anions (F-, Cl-, NO (3) (-) , SO (4) (2-) ), major cations (K+, Na+, Ca2+, Mg2+, NH (4) (+) ), Sr2+ and Sr isotope. The pH increase is due to the result of neutralization caused by the alkaline dust which contain large amount of CaCO3. It was observed that Ca2+ was the most abundant cation with a volume-weighted mean (VWM) value of 217.6 mu eq/L (52.7-1928 mu eq/L), accounting for 66% (39%-88%) of the total cations. SO (4) (2-) was the most abundant anion with VWM value of 237.8 mu eq/L (49.6-1643 mu eq/L). SO (4) (2-) and NO (3) (-) were dominant among the anions, accounting for 66%-97% of the total measured anions. The Sr concentrations vary from 0.01 to 0.92 mu mol/L, and strontium isotopic ratios vary in the range of 0.707684-0.710094, with an average of 0.708092. The elements ratios and the Sr-87/Sr-86 ratios showed that the solutes of rainwater mainly come from weathering of carbonate and secondary dust input. Moreover, urbanization results in the calcium-rich dust increased and the high concentrations of alkaline ions (mainly Ca2+) have played an important role to neutralize the acidity of rainwater, leading to the increase of arithmetic pH mean value by 0.5 units since 2002. It is worth noting that the emission of SO2 and NOx from the automobile exhaust is increasing and is becoming another important precursor of acid rain now. |
Keyword | Major Ions Rainwater Strontium Isotope Base Neutralization |
Subject Area | 环境地球化学 |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/352002/4865 |
Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
Recommended Citation GB/T 7714 | Guilin Han,Qixin Wu,Yang Tang. Acid rain and alkalization in southwestern China: chemical and strontium isotope evidence in rainwater from Guiyang[J]. Journal of Atmospheric Chemistry,2012,68(2):139-155. |
APA | Guilin Han,Qixin Wu,&Yang Tang.(2012).Acid rain and alkalization in southwestern China: chemical and strontium isotope evidence in rainwater from Guiyang.Journal of Atmospheric Chemistry,68(2),139-155. |
MLA | Guilin Han,et al."Acid rain and alkalization in southwestern China: chemical and strontium isotope evidence in rainwater from Guiyang".Journal of Atmospheric Chemistry 68.2(2012):139-155. |
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