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The analytical method described has the advantages of rapidity, sensitivity, and giving clean-cut separations, but the nitrogen peak height (or area) is affected by the presence of nitric oxide and carbon monoxide. Because the important variable is composition and not sample size, more extensive calibration is needed than normal. The enhancement of the nitrogen peak height is linear with respect to per cent nitric oxide, but because nitric oxide is not directly determined, its peak height cannot be used to evaluate a suitable