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Dibromocarboxyarsenazo Discoloring Spectrophotometric Determination of Trace Cerium

Xin Li

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Abstract

The fading action of the rare earth element cerium to dibromocarboxyarsenazo is studied in detail.The results show that the dibromocarboxyarsenazo is oxidized to discolor strongly by trace Ce(Ⅳ) in H2SO4(0.05 mol·L-1) medium,and the fading rate with the concentration of Ce(Ⅳ) obeyed Beer's law in the linear range of 0.25~10 μg/25 mL.The maximum absorption wavelength and apparent molar absorptivity are 530 nm and 7.2×106 L·moL-1·cm-1,respectively.The detection limit is 4.5 μ g· L-1.Based on that,a new discoloring spectrophotometric method for determination of trace Ce(Ⅳ) is developed,with which no pretreatment is needed for samples.The method has been applied to the direct determination of trace cerium in rice,potatoes and other agricultural products.The experiments show satisfactory results with the recovery rate 92%~102%.

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What this paper is about

The fading action of the rare earth element cerium to dibromocarboxyarsenazo is studied in detail.The results show that the dibromocarboxyarsenazo is oxidized to discolor strongly by trace Ce(Ⅳ) in H2SO4(0.05 mol·L-1) medium,and the fading rate with the concentration of Ce(Ⅳ) obeyed Beer's law in the linear range of 0.25~10 μg/25 mL.The maximum absorption wavelength and apparent molar absorptivity are 530 nm and 7.2×106 L·moL-1·cm-1,respectively.The detection limit is 4.5 μ g· L-1.Based on that,a new discoloring spectrophotometric method for determination of trace Ce(Ⅳ) is developed,with which no pretreatment is needed for samples.The method has been applied to the direct determination of trace cerium in rice,potatoes and other agricultural products.The experiments show satisfactory results with the recovery rate 92%~102%.

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Available abstract

The fading action of the rare earth element cerium to dibromocarboxyarsenazo is studied in detail.The results show that the dibromocarboxyarsenazo is oxidized to discolor strongly by trace Ce(Ⅳ) in H2SO4(0.05 mol·L-1) medium,and the fading rate with the concentration of Ce(Ⅳ) obeyed Beer's law in the linear range of 0.25~10 μg/25 mL.The maximum absorption wavelength and apparent molar absorptivity are 530 nm and 7.2×106 L·moL-1·cm-1,respectively.The detection limit is 4.5 μ g· L-1.Based on that,a new discoloring spectrophotometric method for determination of trace Ce(Ⅳ) is developed,with which no pretreatment is needed for samples.The method has been applied to the direct determination of trace cerium in rice,potatoes and other agricultural products.The experiments show satisfactory results with the recovery rate 92%~102%.

Key concepts: Cerium, Molar absorptivity, Detection limit, TRACE (psycholinguistics), Fading, Analytical Chemistry (journal), Trace Amounts, Absorption (acoustics)

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