分析测试学报2013，Vol.32Issue(8)：988-992,5.DOI:10.3969/j.issn.1004-4957.2013.08.015
2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺激光热透镜光谱法测定痕量铑的研究
Study on Determination of Rhodium by Laser Thermal Lens Spectrometry Using 2-(5-Bromo-2-pyridylazo)-5-dimethylaminoaniline
摘要
Abstract
A novel method for the determination of trace rhodium by laser thermal lens spectrometry (LTLS) based on the sensitive color reaction between rhodium(Ⅲ) and 2-(5-bromo-2-pyridylazo)-5-dimethylaminoaniline (5-Br-PADMA)was established.The experiment results showed that in a media of pH 3.6-6.0 HAc-NaAc buffer solution,rhodium (Ⅲ) can react with 5-Br-PADMA to form a violet-red complex.The complex can be changed into another green-blue proton species possessing a high abosorption characteristics in 1.2 mol/L HClO4.The optimal concentrations of HClO4,HCl,H2SO4 or H3PO4 were found to be 0.6-3.6 mol · L-1 for HClO4,0.6-3.0 mol/L for HCl,1.2-4.0 mol/L for H2SO4 and 1.8-4.5 mol/L for H3PO4,respectively.The maximum absorption wavelength was 612 nm which matched well with the output wavelength(632.8 nm) of He-Ne laser.The analytical curve was linear in the concentration range of 5-140 μg/L for rhodium,and the detection limit was 1.1 μg/L.The method,having high sensitivity and good selectivity,was applied in the determination of trace rhodium in the rhodium-carbon catalyst with satisfactory results.关键词
2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺/激光热透镜光谱法/铑Key words
2-(5-bromo-2-pyridylaso)-5-dimethylaminoaniline/ laser thermal lens spectrometry/ rhodium分类
化学化工引用本文复制引用
韩权,霍燕燕,孙丽娟,杨晓慧,翟云会,郝甜甜..2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺激光热透镜光谱法测定痕量铑的研究[J].分析测试学报,2013,32(8):988-992,5.基金项目
陕西省自然科学基础研究计划项目(2010JM2018) （2010JM2018）
西安市科技计划项目(CXY1134WL38) （CXY1134WL38）
