Abstract
In two previous University of Washington field programs, airborne measurements of SO2 using carbonate‐impregnated filters and a Teco pulsed‐fluorescence analyzer showed excellent agreement over a range of ambient concentrations from 2 to 127 ppbv. As part of the Gas‐Phase Sulfur Intercomparison Experiment (GASIE), ambient air, diluted fivefold to tenfold with zero air, was sampled in the concentration range of 0.02 to 4 ppbv. With the bulk of the measurements in the range of 40 to 230 parts per trillion by volume (pptv), agreement between the two techniques was again very good (regression equation: Teco =1.07(filter)+4.5 pptv, r=0.93). Using careful precleaning, impregnation, storage, and handling techniques for the filter substrates, at sub‐100 pptv concentrations, the filter method is capable of an accuracy of better than ±10% with a ±7 pptv uncertainty (due to blank variability) for 6 m3 samples. In addition, the Teco model 43S is capable of rather precise measurements of sub‐100 pptv concentrations (approximately ±16 pptv) provided a suitable averaging time is employed (at least 10 min).
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