The micro-determination of phosphorus as phosphomolybdate

Abstract
The accurate estimation of 0.01-0.1 mgm. P by the molybdate method depends upon (1) the conditions of precipitation; 20 cc. 10% NH4NO3 soln. must be present for every cc. conc. H2SO4; (2) the use of a purified soln. of ammonium molybdate such as that of Pregl; (3) the filtration of the precipitate on an asbestos filter such as that of Bertrand.

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