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研究论文

摘要：重庆地区云水、雨水取样和化学分析结果表明,1989年与1985年相比较,市区雨水酸度变化不大,郊区（白市驿）雨水酸度略有增加;全地区云水酸度变化很大,1985年pH为6.15,1989年pH为4.56.化学组分分析表明,云雨水酸度增加,主要是水中酸性离子(SO₄^2-,NO₃^-)浓度增加,碱性离子浓度减少造成的,并与大气质量变化,即SO₂浓度增加和飘尘量减少相对应.

Abstract：The chemical composition of cloudwater and rainwater in C_hongqing area was compared between 1989 and 1985. The acidity of rainwater in urban district was the same for the two years and the acidity slightly increased in suburban district （Baishiyi）. But the acidity of cloudwater has changed greatly in whole area from pH=6.15 in 1985 to pH = 4.56 in 1989. The chemical composition analyses indicate that the increase in acidic ion （SO₄²- and NO₃-） concentrations and the decrease in basic ion concentrations were mainly responsible for the increase in the acidity of cloudwater and rainwater. This corresponds to the variation in the atmospheric quality, i. e. increase in SO2 concentration and decrease in particulates in the air.