目前,用钾离子选择性电极测定钾,文献上已有许多报导。但现用的电极电位仪(或离子计)测出是测定组份浓度的负对数值。需经作图换算才得出含量。本报告用G—SZ—2型离子计直读浓度挡和7601PVC膜钾离子选择性电极测定各种化肥中的有效钾,并试验了铵离子干扰的消除。方法简单、快速。经和四苯硼钠容量法对照,结果一致。 At present, the potassium ion selective electrode for the determination of potassium, there have been many reports in the literature. However, the current electrode potentiometer (or ion meter) measures the negative logarithm of the concentration of the component. Need to be calculated by drawing conversion content. This report uses the G-SZ-2-type ion meter direct reading concentration block and 7601PVC membrane potassium ion selective electrode to determine the available potassium in various fertilizers and tested the elimination of ammonium ion interference. The method is simple and fast. After the sodium tetraphenylborate volume control, the results are consistent.