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RECEIVEDfor review June 6, 1974. Accepted October 3, 1974. The financial support of the National Aeronautics and Space Administration (1968) and the National Science Foundation (1969-71) is gratefully acknowledged.
NOTES
Further Developments in the Determination of Sulfur Compounds in Air by Gas Chromatography Fabrizio Bruner, Paolo Ciccioli, and Filippo Di Nardo Laboratorio sull’lnquinamento Atmosferico del C.N.R., Via Montorio Romano 36, 00 13 1 Roma, ltaly
T h e advantages of gas chromatography for monitoring of sulfur compounds in the atmosphere have been indicated in earlier papers ( I , 2) and the very low detection limits attained using the flame photometric detector (FPD) made this technique one of most suitable for this scope. Fast response, short time gap between two consecutive measurements, low detection limit, high selectivity, and the absence of wet chemistry operations are the major features which should make this method preferable in monitoring problems. Very recently, it has been also shown t h a t the problems connected with calibration of the apparatus can be solved in a simple and reliable way ( 3 ) by coupling permeation tubes and exponential dilution. However, some difficulties are still hindering a wide use of analytical equipment based on gas chromatography. These arise mainly when background concentrations (
