摘要
本研究于2020年夏季(8月1日-31日)和冬季(12月1日-31日)使用气溶胶化学组分分析仪(ACSM)在太原盆地典型煤焦化工区介休开展PM_(2.5)中主要化学组分(包括SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)、Cl^(-)和有机物)的在线观测。结果表明:在冬季受供暖的影响,煤炭消耗量增加,SO_(2)、NO_(2)和CO等污染物的排放量高于夏季;夏季和冬季PM_(2.5)的浓度分别为(45.66±31.31)μg/m^(3)和(57.74±53.79)μg/m^(3),其中无机气溶胶(SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+))占PM_(2.5)的68.89%和62.41%.无机气溶胶的浓度随PM_(2.5)浓度增大而升高。SO_(4)^(2-)的形成在夏季主要表现为光化学反应,在冬季主要表现为液相反应;NO_(3)^(-)的形成在夏季表现为光化学反应和液相反应,在冬季主要是液相反应;结合风速和风向分析发现夏季区域传输和本地生成对SO_(4)^(2-)和NO_(3)^(-)均有贡献,冬季则主要是本地生成为主。夏季硫氮转化速率为0.26和0.14,冬季硫氮转化速率均为0.09,夏季SO_(4)^(2-)和NO_(3)^(-)的转化效率更高。本研究可为太原盆地相关城市PM_(2.5)污染改善工作提供参考。
In this study,online measurement of main chemical components in PM_(2.5)(including SO_(4)^(2-),NO_(3)^(-),NH_(4)^(+),Cl^(-) and organic matter) was carried out by an Aerosol chemical speciation monitor (ACSM) in Jiexiu,a typical coal coke industry area in Taiyuan Basin,in the summer (August 1-31) and winter (December 1-31) of 2020.The results showed that the emission of SO_(2),NO_(2),CO and other pollutants were higher in winter than those in summer due to the increase of coal consumption for heating supply.The concentrations of PM_(2.5) were (45.66±31.31)μg/m^(3) in summer and (57.74±53.79)μg/m^(3) in winter,and the concentrations of inorganic aerosols (SO_(4)^(2-),NO_(3)^(-),NH_(4)^(+)) accounted for 68.89%and 62.41%of PM_(2.5),respectively.The concentrations of inorganic aerosol increased with PM_(2.5).SO_(4)^(2-)was mainly from the photochemical reaction of sulfur dioxide in summer and aqueous phase reaction in winter,and NO_(3)^(-) was affected by the photochemical reaction and aqueous phase reaction in summer,and the aqueous phase reaction were the dominant formation pathway in winter.Compared with the local emission source in winter,SO_(4)^(2-) and NO_(3)^(-) were from the local emission source and regional transport in summer based on the analysis of wind speed and wind direction.The conversion rates of sulfur and nitrogen were 0.26 and 0.14in summer,and 0.09 in winter,respectively.The results could provide a reference for the improvement of PM_(2.5) pollution in related cities in the Taiyuan Basin.
作者
王伟
田晓
崔阳
郭利利
何秋生
王新明
WANG Wei;TIAN Xiao;CUI Yang;GUO Li-li;HE Qiu-sheng;WANG Xin-ming(College of Environmental Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510630,China)
出处
《太原科技大学学报》
2022年第2期122-128,135,共8页
Journal of Taiyuan University of Science and Technology
基金
国家自然科学基金(42077201)
国家生态环境部攻关项目(DQGG202107)
太原科技大学博士启动基金(20202072)。
关键词
硫酸根
硝酸根
硫氮转化
无机气溶胶
煤烟型
SO_(2)^(-4)
NO_(3)^(-)
sulfur and nitrogen conversion
inorganic aerosol
coal combustion
作者简介
王伟(1995-),男,硕士研究生,主要研究方向为颗粒物污染及控制;通信作者:何秋生,教授,E-mail:heqs@tyust.edu.cn.
