Title: Kinetic Catalytic Determination of Nanogram Amounts of Ruthenium with Butylrhodamine B and Periodate
Abstract: 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%
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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