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我们试用抗铵离子干扰性能较强的饱和漆酚冠醚PVC膜钾离子选择电极、直接测定氮、磷、钾复合化肥中氧化钾的含量。称取经研细并过80目筛的样品2克,置于100毫升烧杯中,加盐酸(1%)50毫升,在不断搅拌下浸取15分钟,然后滤入250毫升量瓶中,用去离子水稀释至刻度。吸取一定量的试液稀释到一定体积,并于100毫升试液中加入离子强度调节剂(243毫升乙醇胺和166毫升盐酸分别用去离子水稀释至1升,然后将两个溶液混合)
We try to use ammonium chloride to resist the strong performance of saturated phenol resin crown PVC membrane potassium ion selective electrode, direct determination of nitrogen, phosphorus and potassium compound fertilizer in the content of potassium oxide. Weigh 2 g of the sample that has been finely ground and passed the 80-mesh sieve, put in a 100-ml beaker, add 50 ml of hydrochloric acid (1%), leach it for 15 minutes under constant stirring, then filter into a 250- Dilute the water to the mark. A certain volume of the test solution was diluted to a certain volume and an ionic strength regulator (243 ml of ethanolamine and 166 ml of hydrochloric acid was diluted to 1 liter with deionized water, respectively) was added to 100 ml of the test solution, and the two solutions were mixed.