[Spectrophotometric determination of microamount phosphorus with crystal violet-heteropoly molybdophosphoric acid in the presence of starch].
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.
Kai
Xiao-ming
XM
Department of Chemistry, Anqing Normal College, Anqing 246001, China.
D005840:Gentian Violet; D008982:Molybdenum / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013213:Starch
D010756:Phosphoric Acids; D010758:Phosphorus; D008982:Molybdenum; D013213:Starch; D005840:Gentian Violet; C003125:phosphomolybdic acid