title: [Seasonality and contribution to acid rain of the carbon abundance in rainwater].
abstract: This paper reports the results from a study of the carbon abundance in rainwater of Guangzhou city, China. The determination of TOC, DOC, POC and PEC helps to study the seasonality of carbon abundance and its contribution to the acid rain. The results display the fact that the average contents of TOC, DOC, POC and PEC are 7.10 mg/L, 3.58 mg/L, 3.60 mg/L and 0.72 mg/L, respectively. These results confirm the deep effect of the organic pollutant to the rain. The seasonality exists in the carbon abundance of rainwater. The contents of TOC and DOC are up to the maximum in spring and the minimum in summer; the contribution of POC to TOC in summer is obviously higher than that in other seasons; and the relative content of POC is clearly higher in dry season than that in wet season. The seasonality reflects the more emission of the total pollutant in spring and the solid particle pollutant in summer than those in other seasons. Moreover, the emission of the organic pollutant from the mobile vehicles is more obvious in dry season than that in wet season. The contents of TOC and DOC have the negative correlation to the pH values, which confirms the contribution effect of the organic pollutant, such as vehicle emission, to the acid rain.
authors.affiliation: Work Station of Post-doctoral, Shengli Oil Field, SINOPEC, Dongying 257015, China. spiritxt@vip.sina.com
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
authors.forename: Zhi-guang
authors.initials: ZG
authors.lastname: Song
authors.forename: Jun-feng
authors.initials: JF
authors.lastname: Liu
authors.forename: Cui-ping
authors.initials: CP
authors.lastname: Wang
mesh_terms: D015258:Acid Rain; D002244:Carbon / Q000032:analysis*; D002681:China; D009930:Organic Chemicals / Q000032:analysis; D011891:Rain / Q000737:chemistry*; D012621:Seasons; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D015258:Acid Rain; D009930:Organic Chemicals; D001335:Vehicle Emissions; D002244:Carbon