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Clinical Chemistry 12: 871-882, 1966;
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Clinical Chemistry, Vol 12, 871-882, Copyright © 1966 by the American Association for Clinical Chemistry

Simplified Method for the Estimation of Inorganic Phosphorus in Body Fluids

Harry Goldenberg 1 and Alberto Fernandez 1

1 Bio-Science Laboratories, 7600 Tyrone Ave., Van Nuys, Calif. 91405.

A simplified procedure is described for the determination of inorganic phosphate in body fluids. The method employs two stable reagents and requires a minimum number of steps. Serum is deproteinized with trichloroacetic acid containing ferrous ion and thiourea. The supernatant is decanted and mixed with a small volume of molybdic acid. The phosphomolybdate formed is immediately reduced in situ by the ferrous ion to produce a blue color that is stable for several hours. The intensity of color is insensitive to changes in concentration of acid, molybdate, ferrous ion, and thiourea, and to losses in decanting the serum supernatant. Excellent conformity to Beer's law is demonstrated over a wide range of phosphorus concentrations. Recoveries of phosphorus added to serum and urine are shown to be quantitative. A comparison is presented between this method and that of Fiske and SubbaRow (1).

Submitted on May 23, 1966
Accepted on June 28, 1966






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Copyright © 1966 by the American Association for Clinical Chemistry.