摘要
用四苯硼钠溶液电导滴定法确定终点，测定钾的含量。适宜测定的ｐＨ＞９，在此范围内氨的存在不干扰测定。测定高含量钾和中含量钾回收率分别在９９．８％～１００．２％和９９．２％～１００．８％。该法简便，测定周期仅需１０ｍｉｎ左右，所需试剂种类和用量少，准确度与四苯硼钾重量法接近，适用于钾盐。
A conductance titration method for the determination of potassium with sodium tetraphenylborate solution is described. The optimum pH should be greater than 9 to avoid the interference of ammonia. The recovery ranges are 99.8%～100.2% for higher potassium contents and 99.2%～100.8% for lower contents. The accuracy of this method is close to that of potassium tetraphenylborate gravimetric method. It is simple and rapid with a total run in the region of 10 minutes. Fewer reagents and less quantities are needed as compared with the gravimetriy. It can be applied for the determination of potassium in potassium salts, bittern and compound fertilizers.
出处
《分析测试学报》
CAS
CSCD
1999年第2期79-81,共3页
Journal of Instrumental Analysis
关键词
钾
含量
电导滴定法
四苯硼钠
测定
Potassium content, Conductance titration, Sodium tetraphenylborate
