The sources of carboxylic acids in precipitation are scarely investigated.Rainwater in Guiyang and Shangzhong from May 2006 to April 2007 were collected,and low-molercular-weight carboxylic acids and major anions/cations were determined.A statistically significant(p=0.001) correlation between CH3COOH and HCOOH at both sites indicates that they either have common or different sources having fairly constant strengths or products of the same reaction.It was suggested that the LMW carboxylic acids in Shangzhong...
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