多源污染条件下南京北郊地区降水离子特征研究

Research on the Ions Characteristics of Rainwater under Complex Pollutions in North Suburb Area of Nanjing

本研究收集了南京北郊地区2016年夏、冬季节雨水样品,采用离子色谱、ICP-MS等方法测定了降水中离子浓度,分析夏、冬两季雨水中阳离子平均浓度的变化规律,揭示该地区金属污染情况。结果表明:雨水中Ca^(2+)、NH_4^+等含量较高,而As^(3+)、Pb^(2+)等重金属元素平均浓度都小于1.5 ppb,Ni^(2+)、Mn^(2+)、Cu^(2+)等重金属离子的浓度在3~13 ppb之间,低于地表水污染标准。研究工作为南京北部地区大气重金属污染评估及污染治理提供了理论依据。

Rainwater samples collected in Nanjing northern suburb area near Nanjing chemical industry park are collected during 2016 sunlmer and winter, the inorganic ions concentrations are measured by ion chromatography and inductively coupled plasma mass spectrometry （ICP-MS）. The variations of the ions concentrations are used to reveal the air metal pollution which was greatly influenced by industry, agriculture and transportation in summer and winter. The results show that Ca^2＋ and NH4^＋ are predominant in these rain samples. The average concentrations of As^3＋ and Pb^2＋ are all less than 1.5 ppb, while the corresponding value of Ni^2＋, Mn^2＋, Cu^2＋ are much lower than the heavy metals pollutions standard for earth surface water, which provides the theoretical basis for evaluating heavy metal pollution and air pollution control in the north area of Nanjing.