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测定磷的磷钼酸铵容量法,操作条件要求较严,常常由于掌握条件的某些差异,导致沉淀不完全和在洗涤时复溶而使测定结果偏低,有时,可偏低达10％左右。为了克服这些缺点,我们应用在分析矿样的条件下,求得标准磷的回收率以计算滴定剂对磷的滴定度,同时应用烤烘法代替洗涤法以化了分去除沉淀中的游离酸,从而不仅简析步骤,且提高了方法的准确性,使测定误差降低到1％左右。操作手续:称取0.1-0.2克矿样于250毫升烧杯中,加入1:1 HN0_3 15毫升,加热煮沸溶解 (约20分钟),将溶液蒸发至近干,加2毫升过氯酸继续加热至白烟冒尽,取下稍冷,加入1:1
Determination of phosphorus ammonium phosphomolybdate volume method, the operating conditions require more stringent, often due to grasp some of the differences in conditions, resulting in incomplete precipitation and the dissolution of the washing result in the determination of low, and sometimes can be as low as 10% about. In order to overcome these shortcomings, we use the analytical sample conditions, the standard phosphorus recovery to calculate the titer of titration of phosphorus, while the application of baked roasting instead of washing method to remove points to remove the free acid in the precipitate , Which not only analyzes the steps, but also improves the accuracy of the method and reduces the measurement error to about 1%. Procedure: Weigh 0.1-0.2 g ore sample in a 250 ml beaker, add 1: 1 HN0_3 15 ml, boiled and heated to dissolve (about 20 minutes), the solution was evaporated to near dryness, add 2 ml of perchloric acid and continue heating to white Smoke out, take a little cold, join 1: 1