超痕量钌的催化反应－示波极谱法研究及应用

CATALYTIC DETERMINATION OF ULTRATRACE AMOUNTS OF Ru WITH SINGLE SWEEP OSCILLOPOLAROGRAPHIC DETECTION

在盐酸介质中，超痕量钌对高碘酸钾氧化对－［（对－苯胺基苯）偶氮］苯磺酸钠这一缓慢反应具有强烈催化作用；在氢氧化钠介质中，对－［（对－苯胺基苯）偶氮］苯磺酸钠产生一灵敏的示波极谱波．据此拟定了一个检出限和测定范围分别为２×１０－１３ｋｇ／Ｌ，１×１０－１２～３．０×１０－１１ｋｇ／ＬＲｕ的催化反应－示波极谱新方法。本法简便快速，选择性好，已用于合成试样和氯化渣中痕量钌的分析，结果满意．

Experimental results show that in hydrochloric acid medium,Ru(Ⅲ)catalyze strongly on the reaction between Orange Ⅳ and KIO4.In sodium hydroxide medium,Orange Ⅳexhibits a sensitive oscillopolarographic wave.On these grounds,a new catalytic reaction-oscillopolarographic method has been developed for the quantification of Ru.The detection limit and linear range are 2×10-13 kg/L and 1×10-12-30×10-12 kg/L Ru,respectively.The present method takes the advantages of rapidity,high sensitivity and selectivity,and has been used to the measurement of Ru in symthetic and real samples with excellent results.