磷钼蓝光度法测定锰铁合金中磷稳定性的试验

Experiment to Determine the Stability of Phosphorus in Ferromanganese Alloy by Phosphorus Molybdenum Blue Photometric Method

试样以稀硝酸溶解后,用高锰酸钾氧化磷为正磷酸,然后加入钼酸铵-酒石酸钾钠溶液与磷酸生成磷钼酸络离子,在氟化钠存在下,氯化亚锡溶液将其还原为磷钼蓝后,迅速加入氢氧化钠溶液降低酸度,以提高磷钼蓝色泽的稳定性,取得了较好的效果。

The sample was dissolved with dilute nitric acid, and the potassium permanganate wad added to oxide phosphorus into orthophosphoric acid, then ammonium molybdate-potassium sodium tartrate solu- tion Was added into to generate phosphomolybdate complex-ion. Now, in the presence of sodium fluoride, and after the tin solution was used to reduce the complex-ion into phosphorus molybdenum blue, now the sodium hydroxide solution was quickly added to reduce the acidity of solution to improve the color stability of phosphorus molybdenum blue, and thus the good result has been achieved.