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Acid rain and alkalization in southwestern China: chemical and strontium isotope evidence in rainwater from Guiyang
Guilin Han; Qixin Wu; Yang Tang
2012
Source PublicationJournal of Atmospheric Chemistry
Volume68Issue: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.

KeywordMajor Ions Rainwater Strontium Isotope Base Neutralization
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://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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