| 摘要: |
| 用偶氮氯膦-mA褪色光度法测定稀土中微量铈的含量,研究铈(Ⅳ)氧化偶氮氯膦-mA(CPA-mA)的褪色反应条件。结果表明,体系最大吸收波长在545nm处;在H2SO4介质中,铈(Ⅳ)量在0~3.2m g/L范围与偶氮氯膦-mA的褪色程度呈良好的线形关系,表观摩尔系数为ε545=1.30×104L·mol-1·cm-1,相关系数γ=0.9989。本方法应用于稀土氧化物中铈的测定,结果与原值相符,6次测定的RSD小于4.3%,平均加标回收率为97%~104%。 |
| 关键词: 铈 稀土 偶氮氯膦-mA 褪色光度法 |
| DOI： |
| 投稿时间：2005-07-19修订日期：2005-08-12 |
| 基金项目: |
|
| Spectrophotometric Determination of Cerium in Rare Earth by Chlorophosphonazo-mA |
|
TAO Hui-lin
|
| (Department of Material and Chemical Engineering, Guilin University of Technology, Guilin, Guangxi, 541004, China) |
| Abstract: |
| Based on the decoloring reaction of CPA-mA with cerium (Ⅳ) in H2SO4 medium, a new method for the determination of micro amount cerium is developed.The maximum absorption is at 545 nm.Beer's law is obeyed in a concentration rang of 0 to 3.2mg/L of cerium.Its molar absorptivity is 1.30×104L·mol-1·cm-1.The method has been applied to the determination of cerium in rare earth oxides with satisfactory results. |
| Key words: cerium rare earth chlorophosphonazo-mA (CPA-mA) decoloring spectrophotometry[FL (2K2] |
