Influence of Sampling Filter on Determination of Anions in Airborne Particulates

概要

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Concerning the analyses of SO42- and NO3- on filters on which airborne particulates were collected, the measurement conditions of SO42- and NO3- on filters and the influences of SO2 and NO2 at low concentration on the analytical value were investigated in order to find out the suitable filter for the airborne particulates sampling. The filters used were glass fiber filter (G. F), quartz fiber filter (Q. F), teflon binding glass fiber filter (T. B), and teflon coated glass fiber filter (T. C). To extract SO42- and NO3- on filters completely, more than ten minutes' work on ultrasonics was needed. Amounts of the ions showed no serious errors by the portions cut from the filters. Anions on filters were stable for 30 days when stored in a freezer under -20°C. The amount of SO42- produced by exposuring SO2 to filters was in the order of G. F >> Q. F > T. B ≈ T. C. As to NO3-amount produced by exposure of NO2, differences among the filters were not appreciably observed. Q. F showed slightly high value of SO42- in airborne particulates but it fits to the monitoring because of its high collection efficiency and low pressure drop. T. C showed the least influence of SO2 and NO2 on the amount of SO42- and NO3- as well as high collection efficiency, but drastic pressure drop by clogging. It was suggested that T. C was suitable for accurate determination of anions in airborne particulates samples collected in a short time.
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