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Study on Determination of Rhodium by Laser Thermal Lens Spectrometry Using 2-(5-Bromo-2-pyridylazo)-5-dimethylaminoaniline |
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DOI:10.3969/j.issn.1004-4957.年份.月份 |
KeyWord:2-(5-bromo-2-pyridylazo)-5-dimethylaminoaniline laser thermal lens spectrometry rhodium |
Author | Institution |
韩权,霍燕燕,孙丽娟,杨晓慧,翟云会,郝甜甜 |
西安文理学院化学与化学工程学院 |
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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. |
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