兰州市大气PM_(2.5)中水溶性无机离子特征及其季节性差异Characteristics and seasonal variations of water-soluble inorganic ions in PM_(2.5) in Lanzhou City,northwest China
沈艳洁,贾晨辉,郭强,毛潇萱,黄韬,马建民,高宏
摘要(Abstract):
于2013年非采暖期(秋季)和采暖期(冬季)分别对兰州市代表性功能区(城关居民区和西固工业区)大气PM_(2.5)中的6种水溶性无机离子进行了观测研究.结果表明:兰州市大气PM_(2.5)中Na~+、K~+、NH_4~+、Cl~-、NO_3~-、SO_4~(2-)的质量浓度具有明显的季节性差异,采样期间平均质量浓度分别为1.17、1.45、10.75、5.92、13.09、15.46μg/m~3,水溶性无机离子在PM_(2.5)中所占的平均比例为37.01%,非采暖期平均质量浓度分别为0.91、1.23、9.57、3.74、11.56、14.69μg/m~3;采暖期平均质量浓度分别为1.44、1.67、11.93、8.10、14.62、16.23μg/m~3;采样期间6种水溶性无机离子的质量浓度均为采暖期大于非采暖期,西固工业区高于城关居民区(K~+除外).NO_3~-/SO_4~(2-)的比值表明兰州市大气污染正由煤烟型向汽车尾气型特征转换.兰州市大气PM_(2.5)中的NH_4~+与SO_4~(2-)主要以(NH_4)_2SO_4方式结合.
关键词(KeyWords): 大气PM_(2.5);水溶性无机离子;季节性差异;兰州
基金项目(Foundation): 中央高校基本科研业务费专项资金项目(LZUJBKY-2013-M03)
作者(Author): 沈艳洁,贾晨辉,郭强,毛潇萱,黄韬,马建民,高宏
DOI: 10.13885/j.issn.0455-2059.2016.03.012
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