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磷铜中间合金中磷的含量为9～15％,一般用化学方法直接测定。本文是将磷氧化为正磷酸,与加入的镁盐生成白色结晶磷酸铵镁沉淀。利用此沉淀不溶于氢氧化铵的特性,过滤分离,再用盐酸中和滤液(稍过量),用原子吸收法测定剩余的镁,然后换算为磷的百分含量。试样中含砷时有干扰。可在加入镁盐之前,加氢溴酸使成种(Ⅲ)挥发除去。方法稳定,快速,准确。 试剂:镁标准溶液:1毫克/毫升。使用时稀释至0.1毫克/毫升;氯化锶溶液:10％。 分析步骤:称0.1克试样,加10毫升硝酸(1+1),10毫升盐酸(1+1)溶解试样并浓缩至2毫升左右,取下稍冷,准确加入镁标准溶液(根据试样含磷量加入不等量的镁),
Phosphor bronze master alloy phosphorus content of 9 to 15%, the general determination of chemical methods. This article is the oxidation of phosphorus into orthophosphoric acid, with the addition of magnesium salt to generate white crystalline magnesium ammonium phosphate precipitation. Using this precipitate insoluble in ammonium hydroxide, the filtrate was separated by filtration, the filtrate was neutralized with hydrochloric acid (a slight excess) and the remaining magnesium was measured by atomic absorption and then converted to the percentage of phosphorus. Samples contain arsenic interference. Prior to the addition of magnesium salts, hydrobromic acid is used to volatilize the species (III). The method is stable, fast and accurate. Reagents: Magnesium standard solution: 1 mg / ml. Use to dilute to 0.1 mg / ml; strontium chloride solution: 10%. Analysis steps: Weigh 0.1 g sample, add 10 ml of nitric acid (1 + 1) and 10 ml of hydrochloric acid (1 + 1) to dissolve the sample and concentrate to about 2 ml. Remove slightly cold and accurately add magnesium standard solution Like phosphorus content by adding different amounts of magnesium),