Sampling and Analysis of Sulfur Dioxide and Particulate Sulfate in Air Using Impregnated Filters

摘要

A simple procedure for simultaneous sampling, but separate analysis of SO2and SO2-4is described in this paper. Both species are collected on one and the same impregnated filter. Using tetrachloromercurate solution for impregnation, sulfur dioxide is effectively absorbed and stabilized as sulfite, but can easily be separated from the co-collected sulfate by a microdiffusion step. By this means both species can be determined in one sample by isotope dilution analysis (IDA).