Color-Fading Spectrophotometric Determination of Cerium with DBC-Arsenazo
来源期刊：JOURNAL OF RARE EARTHS2004年第3期
论文作者：张晓霞 翟庆洲
Key words：chemical analysis; color-fading spectrophotometry; cerium (Ⅳ); DBC-arsenazo; rare earths;
Abstract: In the medium of 0.18～1.08 mol·L-1 sulfuric acid, cerium(Ⅳ) has the color-fading effect on DBC-arsenazo. The apparent molar absorptivity of the color-fading reaction is ε530 nm=1.03×104 L·mol-1·cm-1. Beer′s law is obeyed over the range of 1.20～12.0 μg·ml-1 of Ce (Ⅳ) which shows a linear relationship with the decrease in the absorbance of the colored solution. The effect of thirty-six coexisting ions was studied. The method was applied to the determination of the trace amount of cerium in water samples and has the advantage of high accuracy and good selectivity.
张晓霞1，翟庆洲1
(1.Research Center for Nanotechnology, West Campus, Changchun University of Science and Technology, Changchun 130022, China)
Abstract:In the medium of 0.18～1.08 mol·L-1 sulfuric acid, cerium(Ⅳ) has the color-fading effect on DBC-arsenazo. The apparent molar absorptivity of the color-fading reaction is ε530 nm=1.03×104 L·mol-1·cm-1. Beer′s law is obeyed over the range of 1.20～12.0 μg·ml-1 of Ce (Ⅳ) which shows a linear relationship with the decrease in the absorbance of the colored solution. The effect of thirty-six coexisting ions was studied. The method was applied to the determination of the trace amount of cerium in water samples and has the advantage of high accuracy and good selectivity.
Key words:chemical analysis; color-fading spectrophotometry; cerium (Ⅳ); DBC-arsenazo; rare earths;
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