Abstract
A porous membrane diffusion scrubber designed to collect soluble atmospheric gases without obligatory collection of particulate material has been coupled to an ion chromatograph in a continuous automated manner. With 1 mM H/sub 2/O/sub 2/ used as the scrubber liquid, the collected S(IV) is oxidized to sulfate and determined as such. The instrument operates on a 6-min cycle. During most of this period, the loop of the chromatographic valve is slowly filled with the scrubber effluent. Following a brief stay in the inject position, the valve returns to the load position again. The desired chromatographic separation is accomplished within the cycle time. Thus, a new chromatogram is produced every 6 min. Based on the standard deviation of the blank, the detection limit is better than 20 parts per trillion by volume (pptrv) SO/sub 2/; the lowest standard concentration studied was 77 pptrv. Ambient SO/sub 2/ determination results are presented. The potential of simultaneous determination of several other gases is obvious.
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