摘要
研究用交流示波极谱测定海水中钾的方法。海水试样用NaOH调节pH约12,加入过量四苯硼化钠标准溶液,用微孔滤膜(或滤纸)过滤沉淀。收集游液,用TI(Ⅰ)标准溶液滴定过量的四苯基硼离子。方法回收率为99.5％。测定结果与四苯硼化钾重量法结果一致。海水中共存离子不干扰测定,并可用于海水及多种盐溶液中钾的测定。本法因其简便、快速、准确而易于推广。
The method of determination of potassium in sea water has been investigated using the alternating current oscillo-polarometric titration.An excess of standard Na-TPB solution is added to seawater samples which bad been adjusted to about pH 12 with NaOH solution and collect the precipitate by microporous filter (or filter paper).Then the excess TPB in the filtrate is titrated with the standard solution of Tl (I).The recovery of potassium in seawater samples is 99.5%.The results obtained have been compared with the gravimetric method of potassium-TPB,and both are coincident.This precedure is not interfered by co-existent ions in seawater and suitable for the determination of potassium in seawater and various salty solutions.This method is easily popularized because of its simplicity,rapidity and high accuracy.
关键词
海水
钾
测定
交流示波
极谱滴定
seawater
potassium,alternating current oscillo-polarographic tltradon
