a complex with the pyrazole so that chromatographic separation cannot be achieved. Table II shows the analysis results of samples containing 1.0 ppm N2H< and each of several potential interferences at 100 ppm. Of the interferences tested, only Fe3+ and Cu2+ appear to have a significant effect on the gas chromatographic results. The p-dimethylaminobenzaldehyde (PDAB) results are affected by all but Cu2+ and Al3+. One-half gram of Na2EDTA was therefore added to 100-ml portions of the samples which contain the iron and copper prior to addition of the AA, and the pH was adjusted from ~1 to 5.5 with IN NaOH. The gas chromatographic analysis results show that the N2H< was recovered. Na2EDTA had no effect on the PDAB results.If a sample contains an impurity that has the same retention time as the pyrazole that is sought, a variety of substrates of varying polarity (i.e., polyethylene glycol, cyanoethylated polyols, Amine 220, Apiezon L on Teflon) can be used for this analysis and at least one of the above substrates should allow separation of the pyrazole from the interference. A blank (5) J. Roesmer, "Radiochemistry of Mercury," Nuclear Science Series NAS-NS-3026, rev, USAEC Division of Technical Information, Oak Ridge, Tenn., 1970.

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Due to limitations imposed by the melting points and decomposition temperatures of various salts, comparison of the performance of the two salts in the same temperature range was not made. Conclusion and DiscussionFuks, N. A., "The Mechanism of Aerosols," Macmillan, New York, 1964, pp. 140 and 141.Mackenzie, V. G., Statement given to the Subcommittee on Air and Water Pollution of Committee on Public Works,

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