When determining TP of water using Phosphorus Molybdenum Blue Method, ascorbic acid solution was unstable, can only be kept for several weeks.
磷钼蓝法测定水中总磷，所用的抗坏血酸溶液很不稳定，只能保存数周。
2
After the solution of ammonium molybdate is neutralized by vaporizing and thickening, the secondary ammonium molybdate is crystallized, and the molybdenum from it is retrieved.
The transformation of sodium tungstate solution, direct extraction of sodium tungstate under alkali conditions and separation of molybdenum from tungsten by solvent extraction are mainly introduced.