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  • Title: [Spectrophotometric determination of microamount phosphorus with crystal violet-heteropoly molybdophosphoric acid in the presence of starch].
    Author: Kai XM.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2002 Jun; 22(3):451-2. PubMed ID: 12938332.
    Abstract:
    The determination of phosphorus with crystal violet-heteropoly molybdophosphoric acid in the presence of starch has been studied. In the medium of 0.15 mol.L-1 H2SO4, the apparent molar absorptivity of the ion associated complex is 1.98 x 10(5) L.cm-1.mol-1 at 548 nm, and it is stable for more than 24 hours. Beer's law is obeyed over the range of 0-8 micrograms.(50 mL)-1 for phosphorus. The molar ratio of heteropoly molybdophosphoric acid to crystal violet is established to be 1:5. The method is satisfactory for the determination of phosphorus in iron basic samples.
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