Rapid Determination of Phosphorus in Gasoline. Spectrographic and Colorimetric Methods

Abstract

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.

Rapid Fusion Determination of Phosphorus in Gasoline

“…It has also been determined colorimetrically following conversion of the organophosphorus compounds to inorganic phosphate, either by evaporating the gasoline and wet oxidizing (5) or by ashing in zinc oxide (2,4,6). By the more rapid method described below a single sample can be analyzed in less than 30 minutes.…”

Rapid Combustion Method for Determination of Phosphorus in Petroleum Products

“…Phosphorus is also often determined as the reduced phosphomolybdate complex or the phosphomolybdivanado complex (4) following conversion of the organophosphorus compounds to inorganic phosphate. This conversion can be accomplished by wet oxidation (1) or by ashing in zinc oxide (9,10,14). Neither is particularly rapid.…”