【摘 要】
：
The investigation of pH variation and the chemical composition of rainwater have heen studied from April 2003 to October 2006 at a rural area of Nakorn Pathom P
【机 构】
：
Department of Environmental Science
【基金项目】
：
the Pollution Control Department of Thailand
论文部分内容阅读
The investigation of pH variation and the chemical composition of rainwater have heen studied from April 2003 to October 2006 at a rural area of Nakorn Pathom Province,western Thailand.The pH value ranged from 4.0 to 7.8 with an average of 6.1.Out of 319 rain events,72 events were observed in acidic range(pH＜5.6).The pH of rainwater gradually increased over the sampling period.The volume-weighted mean concentrations (μeq/L)of ion species followed the order:Ca2+＞NH4+＞SO42-＞HCO3-＞NO3-＞Na+＞C1-＞CH3COO-＞Mg2+＞K+＞H+＞HCOO-＞PO43-.Neutralization factor calculations reveal that Ca2+ plays a major role in neutralization processes in this area.Enrichment factor calculations indicate that SO42-,K+,Ca2+and Mg2+ were originated from non-marine sources.The statistical measure principie component analysis indicates influence of various local emission sources e.g.,soil,limestone mines,biomass burning and agricultural emissions,on the chemical composition of rainwater.
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