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A new procedure for the determination of cerium was established using the catalytic effect of Ce(IV) on the oxidation of tribromoarsenazo(TB-ASA) by potassium bromate.In 0.080 mol/L sulfuric acid medium,the maximum absorption peak of Ce(IV)-(TB-ASA)-KBrO3 system is at 510 nm.The amount of Ce(IV) and the difference of absorbance(△A) showed a good linear relationship over the range of 5.7×10-8-5.1×10-7 mol/L.The regression equation is △A=2.3×10-11 C(C:mol/L)+0.0196,with a regression coefficient of 0.9914 at the wavelength.The detection limit of the method was 5.1×10-8 mol/L ng/mL.This method was used in the determination of cerium in human blood and chicken liver samples.For the eleventh replicate determinations,its relative standard deviation was 3.04%-3.28%.The recovery of standard addition of the method was 100.7%-104.2 %.
A new procedure for the determination of cerium was established using the catalytic effect of Ce (IV) on the oxidation of tribromoarsenazo (TB-ASA) by potassium bromate. In 0.080 mol / L sulfuric acid medium, the maximum absorption peak of Ce ) - (TB-ASA) -KBrO3 system is at 510 nm. The amount of Ce (IV) and the difference of absorbance (ΔA) showed a good linear relationship over the range of 5.7 × 10 -8 -5.1 × 10- The regression equation is Δ A = 2.3 × 10-11 C (C: mol / L) + 0.0196, with a regression coefficient of 0.9914 at the wavelength. The detection limit of the method was 5.1 × 10-8 mol / L ng / mL. This method was used in the determination of cerium in human blood and chicken liver samples. For the eleventh replicate determinations, its relative standard deviation was 3.04% -3.28%. The recovery of standard addition of the method was 100.7% -104.2%.