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本文研究了新的間接結合滴定法測定鈸。方法是基于Be~(2+)与大过量固体CaF_2作用生成稳定的氟鈸络离子而解放出Ca~(2+),用RDTA滴定Ca~(2+)而知Be~(2+)量。試液的pH应为2.80-3.20;反应混合物应震搖1小时以达平衡,生成络合物的組成主要是BeF~+,但亦有含氟較多的络离子生成,且其量与Be~(2+)的瞬度有关,故应作校正因素曲线;一系列离子及大量盐类存在影响測定,但NH_4cl量在0.5-2.0g之間对结果无显着影响。本法可能用于較高含鈸量样品中測定鈸。
This article studies a new indirect binding titration assay for cymbals. The method is based on the reaction of Be 2+ with a large excess of solid CaF 2 to generate stable cyfluride ions and liberate Ca 2+, titrate Ca 2+ with RDTA, . The pH of the test solution should be 2.80-3.20; the reaction mixture should be shaken for 1 hour to reach equilibrium. The composition of the complex is mainly BeF ~ +, but there is also a complex ion with more fluorine, (2+), it should be calibrated factor curve; a series of ions and a large number of salts exist impact determination, but the amount of NH_4cl in 0.5-2.0g between the results had no significant effect. This method may be used for the determination of cymbals in samples containing a higher amount of cymbals.