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催化動(dòng)力學(xué)分光光度法測(cè)定痕量銪
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Catalytic Kinetic Spectrophotometic Determination of Trace Europium
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    摘要:

    利用過(guò)氧化氫氧化麗春紅褪色，以Eu3+為催化劑，建立一種新的測(cè)定銪的動(dòng)力學(xué)分光光度法。在6.0×10-2 mol/L的鹽酸介質(zhì)中，Eu3+-H2O2-麗春紅體系的最大吸收峰位于450 nm，Eu3+量在0~22 μg/25 mL范圍內(nèi)與吸光度差值△A呈良好的線(xiàn)性關(guān)系，其回歸方程為△A = 0.0221 C + 0.0241 (C=μg/25 mL)，相關(guān)系數(shù)r = 0.9968，方法檢出限為2.42 μg/L。本方法用于水樣中銪的測(cè)定，13次測(cè)定相對(duì)標(biāo)準(zhǔn)偏差為0.49%~1.76%，加標(biāo)回收率為95.20%~101.3%。

    Abstract:

    A new method for the determination of europium by kinetic spectrophotometry was established based on the catalytic effect of europium (III) on the fading reaction of ponceau with hydrogen peroxide. The maximum absorption peak of Eu3+- H2O2-Ponceau system is located at 450 nm in a 6.0×10-2 mol/L HCl medium. The absorbance difference (△A) is linearly related with the concentration of europium (III) in the range of 0-22 μg/25 mL, fitting the equation △A = 0.0221C+0.0241 (C = μg/25 mL ), with a regression coefficient of 0.9968. Detection limit of the method is 2.42 μg/L. The method was used to determine europium in environmental water samples. The relative standard deviation was 0.49%-1.76% for 13 replicated determinations. The recovery of the standard addition of the method was 95.20%-101.3%.

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張曉霞,趙 妍,徐惠星.催化動(dòng)力學(xué)分光光度法測(cè)定痕量銪[J].稀有金屬材料與工程,2011,40(6):1065~1068.[Zhang Xiaoxia, Zhao Yan, Xu Huixing. Catalytic Kinetic Spectrophotometic Determination of Trace Europium[J]. Rare Metal Materials and Engineering,2011,40(6):1065~1068.]
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  • 收稿日期:2010-06-22
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