天津市冬季蜂窝状溶蚀器涂层溶液最适浓度研究

Determining the optimal concentration of coating solution attaching to honeycomb denuder in winter in Tianjin

在特定时间特定地点利用溶蚀器PM2.5采样系统进行PM2.5采样前,应首先确定溶蚀器涂层溶液最适浓度.为确定在天津市冬季利用蜂窝状溶蚀器PM2.5采样系统采样的最优化条件,于2014年1月1日∽2月24日,在南开大学理化楼楼顶进行蜂窝状溶蚀器涂层溶液最适浓度的条件实验.结果表明：在天津地区冬季,蜂窝状溶蚀器的碳酸钠涂层溶液最适浓度为4%,柠檬酸涂层溶液最适浓度为5%;环境空气中HCl气体对PM2.5中Cl-的质量浓度测定影响不大,而HNO3、SO2、NH3等酸/碱性气体对PM2.5中相对应离子的质量浓度测定影响较大.

Determining the optimal concentrations of denuder coatings is necessary before sampling PM2.5 using denuder sampling system at a specific time and location. In order to determine the optimum sampling condition of a PM2.5sampling system with honeycomb denuder in winter in Tianjin, the experiments for optimizing the concentrations of honeycomb denuder coatings were carried out from January 1 to February 24, 2014 at the roof of Lihua building at Nankai University. The results of the experiment showed that the optimal concentration of sodium carbonate coated on the honeycomb denuder was 4%, and the optimal concentration of citric acid was 5% in winter in Tianjin; the impact of HCl in ambient air on concentration of Cl- in PM2.5 was relatively small; while acidic/alkalic gases such as HNO3、SO2、NH3had significant impacts on the concentrations of ions in PM2.5, respectively.