Kai Xiao-ming
Department of Chemistry, Anqing Normal College, Anqing 246001, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Jun;22(3):451-2.
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.
研究了在淀粉存在下用结晶紫 - 磷钼杂多酸测定磷的方法。在0.15 mol·L⁻¹硫酸介质中，该离子缔合物在548 nm处的表观摩尔吸光系数为1.98×10⁵ L·cm⁻¹·mol⁻¹，且在24小时以上保持稳定。磷在0 - 8 μg·(50 mL)⁻¹范围内遵守比尔定律。确定磷钼杂多酸与结晶紫的摩尔比为1:5。该方法用于测定铁基样品中的磷，结果令人满意。
