泰州市降水化学组成的研究

Study on Chemical Composition of Rainfall in Taizhou City

通过对泰州市2011 ～ 2012年期间的57次降水样品进行化学组成测试,研究了降水中的阴阳离子浓度总和与电导率的关系,发现降水的平均pH和电导率分别为5.90和42.3 μs/cm,总体上看,降水呈中性,并且比较清洁.降水中各离子浓度按大小顺序排列为SO42-＞Ca2＋ ＞NO3-＞Cl-＞NH4＋＞Na＋＞Mg2＋＞F-＞K＋＞H＋,其中SO42-和NO3-是泰州地区主要的致酸物质.在阳离子组成中,对降水中酸性物质的中和作用,钙要大于氨.降水中的离子浓度总和与电导率之间呈相关关系,降水中的阴阳离子计算得出的理论电导率与实测电导率在数值上基本也是一致的.

Through the measurement of chemical composition of 57 times rainwater in Taizhou City from 2011 to 2012, the relationship be- tween total ions＇ concentration and electrical conductivity （EC） of the rainwater was investigated. It was found that the average pH value and EC of the rainwater in this region are 5.90 and 42.3 μs/cm, respectively. Generally speaking, the rainwater in this region is neutral and clean. The order of the concentration of each ion in the rainwater is SO42- 〉 Ca2＋ 〉 NO3 - 〉 Cl- 〉 NH4＋ 〉 Na＋ 〉 Mg2＋ 〉 F- 〉 K＋ 〉 H ＋. Among them, SO42- and NO3 - are the main substances of leading acidity in Taizhou region. Among the cationic ions in the rainwater, Ca2＋ has more ability than that NH4 ＋ for the neutralization of acidity of rainwater. The relationship between total ion concentration and EC in the rainwater is in accordance with that theoretically calculated in numerical value.