spansored by the United States Covcmmnt. Neither the UNted Stater nor the United Stater h p u l m n t Of Emrgy. nor any of their employees. nor any of their contractors. rubcontracton. or their cmployetr. maker any wunnty, expren or implied, or usurnes any legal liability or responsibility for the rccuney, completeness or uvfulneu of any information. apparatus. product or prwn duelored. or reprerenu that ita UI would not infringe ~~" v a t c l y o w e d riahu.
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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