文献类型：期刊文献

中文题名：西宁取暖季PM_(2.5)水溶性离子的污染特征研究

英文题名：Research on pollution characteristics of water-soluble ions in PM_(2.5) during heating season in Xining

作者：胡晓峰[1,2];赵露[2];李佳[2];修光利[1];王建荣[3]

机构：[1]华东理工大学资源与环境工程学院国家环境保护化工过程环境风险评价与控制重点实验室,上海200237;[2]青海大学化工学院,青海西宁810016;[3]青海省环境科学研究设计院,青海西宁810007

年份：2019

卷号：41

期号：1

起止页码：95

中文期刊名：环境污染与防治

外文期刊名：Environmental Pollution & Control

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：青海省自然科学基金资助项目(No.2017-ZJ-789)

语种：中文

中文关键词：PM2.5;水溶性离子;污染特征;西宁

外文关键词：PM2.5;water-soluble inorganic ions;pollution characteristics;Xining

摘要：于2017年1—5月(取暖季)在西宁市区、郊区、农村设置采样点采集PM_(2.5)样品,利用离子色谱法测定PM_(2.5)中水溶性无机离子浓度。结果表明:取暖季西宁大气PM_(2.5)日均质量浓度为(55.98±52.66)μg/m^3,呈现明显的市区>郊区>农村的浓度变化特征。PM_(2.5)中水溶性离子质量浓度之和占PM_(2.5)质量浓度的36.3%,水溶性离子平均浓度大小为SO_4^(2-)>NO_3^->NH_4^+>Na^+>Cl^->C_2O_4^(2-)>Ca^(2+)>F^->K^+>Mg^(2+);取暖季西宁大气硫氧化率(SOR)和氮氧化率(NOR)平均值分别为0.21、0.13,表明SO_4^(2-)、NO_3^-主要由二次转化形成,PM_(2.5)中NO_3^-/SO_4^(2-)(质量浓度比)为0.75,阳离子与阴离子电荷摩尔数比值为0.89,表明燃煤是PM_(2.5)主要贡献源,颗粒物总体呈酸性。后向轨迹分析表明,重污染期间西宁PM_(2.5)及其中水溶性离子的浓度变化不仅受本地污染源的影响,也受外来气团输送的影响。
The PM 2.5 samples were collected at urban,suburb and rural area of Xining from January to May(heating season)of 2017.The water-soluble inorganic ions in PM 2.5 were determined by ion chromatography method.The results showed that during heating season,the daily mean mass concentration of PM 2.5 was(55.98±52.66)μg/m 3 in Xining,which presented significantly characteristics of urban >suburb >rural area.The total mass concentration of the water soluble ions determined in this study accounted for 36.3%of PM 2.5,the average concentration of water-soluble ions occurring the following sequence:SO4^2- >NO3^- >NH4^+ >Na^+ >Cl%- >C2O4^2- >Ca^2+ >F^- >K^+ >Mg^2.The average sulfur oxidation rate(SOR)and nitrogen oxidation rate(NOR)of Xining atmosphere were 0.21,0.13 separately,which meant the SO4^2-,NO3^- in PM 2.5 were mainly formed by secondary transformation,NO3^-/SO4^2(mass concentration)of PM 2.5 was 0.75 and the mole ratio of anion charge to cation charge was 0.89,demonstrating that coal combustion was still the dominating source of PM 2.5 and the particle were generally acidic.Backward trajectory analysis indicated that the PM 2.5 and water soluble ion in Xining during heavy pollution were not only influenced by the local pollution sources,but also affected by foreign air transportation.