用磷钼钒黄测定磷已有深入的研究与广泛的应用,而用磷钼钒蓝测定钒则研究较少.我们发现磷钼钒虽和磷钼黄差不多在相同条件下形成,而当磷钼钒一旦形成就异常稳定,在高浓度的硫、磷酸中不分解,用二氯化锡等强还原剂能将其还原成磷钼钒蓝.并类似资料所介绍的能进一步形成在水相中保持相对稳定的磷钼钒蓝一罗丹明B多元络合物.其吸光度与钒含量成正比,摩尔吸光系数为2.8×10~5升·摩尔~(-1). Phosphorus molybdenum vanadium yellow determination of phosphorus has been in-depth study and extensive application, and vanadium molybdenum vanadium blue is less studied.We found that phosphorus and molybdenum phosphorus and phosphorus molybdenum yellow, although formed under the same conditions, and when the phosphorus Once formed, molybdenum-vanadium is unusually stable, does not decompose in high concentrations of sulfur and phosphoric acid, and can be reduced to phosphomolybdovanadium with a strong reducing agent such as tin dichloride and the like can be further formed in an aqueous phase In which the molar absorptivity is 2.8 × 10 ~ 5 L · mol ~ (-1), which is proportional to vanadium content.