STUDIES ON THE CERULEOMOLYBDATE DETERMINATION OF PHOSPHORUS

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Abstract
Several modifications of the Truog and Meyer method for the colorimetric determination of P were investigated. By the use of a Klett-Summerson photoelectric colorimeter an agreement of the test to Beer''s law was demonstrated for 0.05 to 1.75 ppm. of P as orthophosphate. As much as 4.5 m.e. of (NH4)2SO4 ,or MgS04 may be present in 50 ml. of the final test soln. without seriously affecting the results. At higher concs., the Mg ion apparently exerted a greater effect upon color development than the ammonium ion. An apparatus was illustrated for the effective preservation of the stannous chloride soln. under H2 for an unlimited period of time. Consideration was also given to the prepn. and storage of the other reagents, thus ensuring consistent results over a long period and providing for speed and accuracy in routine analysis.

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