b This paper describes a spectrographic and a colorimetric method for determining the phosphorus content of gasolines. Neither method is affected by the presence of additives such as tetraethyllead, antioxidants, dyes, or metal deactivators. The spectrographic procedure is applicable to phosphorus concentrations from 5 to 75 mg. per liter with a standard deviation of 0.8 mg. per liter. A single determination can b e made in 30 minutes; a two-man team can make 70 determinotions per day routinely. The colorimetric procedure is applicable to concentrations of 5 to 50 mg. per liter with a standard deviation of 0.5 mg. of phosphorus per liter. This procedure requires 1 hour for a single determination, but 24 determinations can b e made per man-day.
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