Colorimetric methods measure phosphorus concentration using color changes in phosphate solutions, indicating detection efficacy.
OF the several colorimetric methods for the determination of phosphorus which have been described during recent years, probably the Briggs [1922] modification of the Bell and Doisy [1920] method and the method of Fiske and Subbarow [1925] have met with most general favour. Both these methods depend on the reduction of phosphomolybdic acid to give a blue colour, the intensity of which is proportional to the concentration of phosphate.
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E. J. King (1932) studied this question.
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