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Abstract
Swamps and tidal flats are believed to he important natural sources of atmospheric H2S, though it is very difficult to detect the low concentrations of this trace gas above the surface of these regions. In view of this problem an air sampling device has been developed for the sampling of atmospheric H2S with chemically impregnated filters. The sulfide generated on the filter is analyzed in a washing solution employing a very sensitive fluorescence method. The quality of the method is demonstrated by comparative calibrations. The fluorescence method is calibrated in the liquid phase with standard solutions of sulfide. Furthermore the sampling and analyzing method is calibrated together by using H2S calibration gases. The detection limit of the method is shown to he 10ng/m3 STP. Data of test-measurements in ambient air and some results of field-measurements in the lower troposphere are presented.