A METHOD FOR THE DETERMINATION OF SMALL QUANTITIES OF CARBON MONOXIDE IN AIR
TL;DRAbstract
A colorimetric method is described for determining CO in the concentration range of 0.004% to 0.25%. Measured volumes of a known CO-in-air mixture and an unknown gas sample were reacted with a measured volume of palladium chloride-phosphomolybdic acid-methyl ethyl ketone. Molybdenum blue was formed. The optical density of the reacted liquid, determined with a photoelectric colormeter, was proportional to the number of ml of CO in the gas samples. The method was sensitive and reliable. The mean error of 39 consecutive analyses of 4- to 25-ml samples was 2% of the amount of CO present in the gas samples. Disadvantages of the method included (1) the 2 wk required to prepare the CO reagent, (2) the short period (2 to 3 mo) during which the prepared reagent gave reproducible results, (3) the variability of the reactions with CO of reagents made with different lots of phosphomolybdic acid, and (4) the lack of specificity of themethod for CO. The method is considered applicable to sstudies of
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A colorimetric method is described for determining CO in the concentration range of 0.004% to 0.25%. Measured volumes of a known CO-in-air mixture and an unknown gas sample were reacted with a measured volume of palladium chloride-phosphomolybdic acid-methyl ethyl ketone. Molybdenum blue was formed. The optical density of the reacted liquid, determined with a photoelectric colormeter, was proportional to the number of ml of CO in the gas samples. The method was sensitive and reliable. The mean error of 39 consecutive analyses of 4- to 25-ml samples was 2% of the amount of CO present in the gas samples. Disadvantages of the method included (1) the 2 wk required to prepare the CO reagent, (2) the short period (2 to 3 mo) during which the prepared reagent gave reproducible results, (3) the variability of the reactions with CO of reagents made with different lots of phosphomolybdic acid, and (4) the lack of specificity of themethod for CO. The method is considered applicable to sstudies of
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