萤石中磷的测定称取试样0.5克于铂坩埚中,加碳酸钠2克,熔融。冷却后,用硝酸(1+3)18毫升分两次浸取熔块(用塑料棒搅拌),溶液移于小口塑料瓶(容量70毫升)中,用2～5毫升水洗涤坩埚,并入塑料瓶中。加酸性钼酸铵溶液(试剂的配制,操作及检量线的绘制,详见本刊1976年第6期39页)8～10毫升,用吸管加乙酸丁酯10毫升,加硼酸约2克,加塞,萃取1分钟(在 Determination of phosphorus in fluorite Weigh the sample 0.5 g in a platinum crucible, add 2 g of sodium carbonate and melt. After cooling, the frit was leached with 18 ml of nitric acid (1 + 3) in two batches (with a plastic bar) and the solution was transferred to a small plastic bottle (70 ml capacity). The crucible was washed with 2 to 5 ml of water, Plastic bottle. Add acidic ammonium molybdate solution (reagent preparation, operation and calibration curve drawn, see the journal of 1976 sixth period 39 pages) 8 to 10 ml with a straw plus butyl acetate 10 ml, add about 2 grams of boric acid , Stoppered, extracted for 1 minute (at