Abstract：The coloring reaction between ruthenium (II) and 5-(5-cyano-2-pyridylazo)-2, 4-diaminotoluene (5-CN-PADAT) was studied, which was then applied for the determination of micro ruthenium in ruthenium catalysts on activated carbon and molecular sieve. The experimental results showed that ruthenium (II) could react with 5-CN-PADAT in HAc-NaAc buffer solution at pH 4.0-5.5 in presence of hydroxylamine hydrochloride to form a stable wine-colored complex which had maximum absorption wavelength at 520nm. After acidification with 0.3mol/L HCl, the complex was converted to another kind of doubly protonated type with higher absorption features. It presented two absorption peaks located at 538nm and 611nm, respectively. Under the optimal experimental conditions, the mass concentration of ruthenium (II) in range of 0.1-0.9μg/mL was linear to the sum of absorbance at 538nm and 611nm. The correlation coefficient was 0.9997. The apparent molar absorptivity was 1.08×105 L·mol-1·cm-1. The proposed method was applied for the determination of micro ruthenium in ruthenium catalysts on activated carbon and molecular sieve. The found results were consistent with the reference values. The relative standard deviations (RSD, n=6) were in range of 1.3%-3.4%. The spiked recoveries were between 96.5% and 101.0%.
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