摘要
提出了在弱酸介质中钌催化高碘酸盐氧化丁基罗丹明Ｂ（ＢＲＢ），以光度法测定钌。催化反应速率与催化剂浓度呈线性关系的范围为０．２～１８ｎｇ／２５ｍ Ｌ，检出限为２．８×１０－ １２ ｇ／ｍ Ｌ。相对标准偏差小于１４％ 。催化反应对Ｒｕ（Ⅲ）、ＢＲＢ、ＫＩＯ４ 和Ｈ３ＰＯ４ 均为一级反应，表观活性能为４２．１２ ｋＪｍ ｏｌ－ １。探讨了反应机理。本法已用于某些岩矿和冶金产品中钌的测定。ＲＳＤ为１．０２％ ～２．２９％ ，回收率为９８．７％ ～１０２．０％
A kinetic method is suggested for ruthenium determination by its catalytic action on oxidation of butylrhodamine B (BRB) with periodate in a weakly acid medium by spectrophotometric measurements of the reaction rate.There is a linear dependence between the rate of reaction and catalyst concentration in the range of 0 2～18ng/25mL for Ru.The detection limit is 2 80×10 -12 g/mL for Ru.The relative standard deviation for 11 replicate measurements of 0 2,5 and 15ng/25mL of Ru(Ⅲ) is 13 73%,7 35% and 2 09%,respecively.The catalytic reaction is first order for Ru(Ⅲ),BRB,KIO 4 and H 3PO 4,and the apparent activation energy of the catalytic reaction was found to be 42 12kJ mol -1 .The reaction mechanism is discussed.1000 fold excess of Ag +,400 fold Pt(Ⅳ) and Pd(Ⅱ),30 fold Au(Ⅲ) and Ir(Ⅳ) and 10 fold Os(Ⅷ) do not interfere.The method was used for the determination of nanogram amount of ruthenium in some ores and metallurgical products.The RSD( n =8) was 1 02%～2 29% and recoveries were 98 7%～102 0%
出处
《分析试验室》
CAS
CSCD
1999年第6期10-14,共5页
Chinese Journal of Analysis Laboratory
关键词
催化光度法
钌
丁基罗丹明B
高碘酸盐
Catalytic spectrophotometry
ruthenium
butylhodamine B
periodate
ore
metallurgical products
