定pH法测定高放废液1AW中的游离酸

DETERMINATION OF FREE ACID IN HIGH LEVEL LIQUID WASTES BY MEANS OF FIXED pH VALUE

摘要: <正> 前言玻璃固化处理高放废液1 AW时,要求预先了解废液中游离酸的浓度,为此,需要建立一个简便,快速,准确测定高放废液中游离酸的方法。由于高放废液1 AW中存在着UO_2~(2+),Fe~(3+),Al~(3+)等多种可水解离子,致使一般的酸碱滴定法无法适用。

Abstract: For the determination of free acid in high level liquid wastes, 8% potassiumoxalate solution with pH 6.50 as a complex agent of hydrolizable ion is added to1AW and the solution is titrated with standard sodium hydroxide to reach theoriginal pH value. The quantity of free acid is calculated by standard sodiumhydroxide consumed. This method is simple, rapid and accurate. The ralative error of analysis isless than ±4%. The average percentage of recovery is 99. 6--101. 0%.