以氟化铵掩蔽钛,加入钒酸铵和钼酸铵生成钼钒磷杂多酸,借此进行光度法测定。对于含磷量低的样品采用甲基异戍酮萃取富集提高灵敏度。一、试剂氟化铵溶液:6%,贮于塑料瓶内。钒酸铵溶液:1.2%,称偏钒酸钠6克,加入300ml水,加热溶解,冷却后加入浓硝酸15ml,稀释至500ml。 Titanium fluoride was masked with ammonium fluoride, and ammonium vanadate and ammonium molybdate were added to form heteropoly-molybdovanadophosphoric acid, whereby spectrophotometry was performed. For low phosphorus content of the sample using methyl isophenone extraction and enrichment to improve sensitivity. A reagent ammonium fluoride solution: 6%, stored in plastic bottles. Ammonium vanadate solution: 1.2%, said sodium metavanadate 6 grams, adding 300ml of water, heated to dissolve, after cooling concentrated nitric acid 15ml, diluted to 500ml.