福建省沿海地区海盐和大气污染物反应的致酸作用
THE MECHANISM OF REACTION BETWEEN SEA SALT WITH ATMOSPHERIC POLLUTANTS TO ACIDIFY RAINWATER IN COASTAL AT FUJIAN PROVINCE
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摘要: 本文着重研究福建省沿海地区海盐和大气污染物反应的致酸作用,从源排放估算、致酸前体物观测、大气气溶胶组成分析、降水离子特征分析四个层次进行讨论.结果表明HCl人为排放源仅占SO2,NOx的4%;大气中活性氯:HCl最大浓度为4.23μg·m-3,Cl2最大浓度为3.9μg·m-3;气溶胶中Cl-/Na+比和降水中Cl-/Na+比背离,降水中过量氯与H+浓度呈现正相关,过量氯对H+浓度最大贡献达39%.Abstract: This paper is concerned with the reaction between sea salt with atmospheric pollutants to acidify rainwater in coastal. The pollutant emissive flux is estimated, and the preacidifying pollutant is measured. Ions concentration in aerosol and rainwater also is analysed by ion chromatography. The result shows HCl emissive flux only contains 4% of SO2 and NOx emissive flux. The highest HCl and Cl2 concentration are 4. 23μg·m-3, 3. 97μg·m-3 respectively. The ratio of Cl/Na- in aerosol is constract to that in rainwater. The excess chloride is positively relative to H+ concentration. It attained 39% of HCl to contribute to H- concentration.
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