Fading kinetic spectrophotometic determination of trace ruthenium based on catalytical action of ruthenium on reaction of bromophenol blue and potassium periodate
WANG Hong-fu, SU Zhi-xian, LUO Ying, et al
1. School of Chemistry and Chemical Engineering, Mianyang Normal Universtity, Mianyang 621000, China;
2. Ecology and Environmental Technology Protection Key laboratory of Sichuan Province，Mianyang 621000, China;
3. School of Life Science and Technologe , Mianyang Normal Universtity, Mianyang 621000, China
Abstract：Ruthenium (III) had significant catalytic effect on the fading reaction of bromophenol blue oxidized by potassium periodate in the medium of diluted sulfuric acid and sodium tetraborate at 85 ℃ water bath. On the basis of this fact, a novel method for determination of ruthenium was proposed by catalytic kinetic spectrophotometry. The experiment results indicated that the absorbency difference ΔA remained a good linear relationship with the mass concentration of ruthenium in the range of 9.6×10-4-4.4×10-２ μg/mL. Detection limit of this method was 1.506 × 10-10 g/mL. The catalytic reaction was a first order reaction for ruthenium) while the whole reaction was pseudo-first order reaction under the experiment condition with apparent rate constant of 4.137×10-3 /s and apparent activation energy of 56.45 kJ/mol. The determination was conducted on 1.0 μg of ruthenium in 25 mL of solution and the relative standard deviation was 1.3％(n=11). This method was applied to determine ruthenium in molecular sieve and activated carbon samples with the relative standard deviations (n=6) of 4.7% and 1.1% respectively and the recoveries of 98% and 102%.
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WANG Hong-fu, SU Zhi-xian, LUO Ying, et al. Fading kinetic spectrophotometic determination of trace ruthenium based on catalytical action of ruthenium on reaction of bromophenol blue and potassium periodate. , 2012, 32(6): 56-59.
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