volume 96, issue D12, P22373 1991
DOI: 10.1029/91jd02057
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Abstract: Recent improvements to the carbonateimpregnated filter technique for measuring low-level SO2 concentrations have resulted in dramatically improved performance. The improvements are (1) a better cleaning procedure for the paper filter substrates, resulting in approximately 60% reduction of their sulfate blank, (2) the use of an ion-exchange resin to remove the carbonate matrix from the sample extract, resulting in a 100% increase in the signal-to-noise ratio, (3) the use of high-purity glycerol in the filter i…

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