Abstract
A modified oxygen-flask combustion procedure has been developed for the determination of phosphorus in organic materials difficult to oxidize by conventional flask methods. Combustion takes place in a mixture of oxygen and nitrogen oxides and absorption and hydrolysis to orthophosphate are aided by heating the flask and contents before opening. The orthophosphate formed is determined spectrophotometrically as the molybdenum blue complex. Color development and stability are aided by heating the solution briefly after adding the color reagents. Data are presented to show the accuracy and precision of the method.
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