2-(3,5-二氯-2-吡啶偶氮)-5-二甲氨基苯胺激光热透镜光谱法测定钯  

Laser Thermal Lens Spectrometric Determination of Trace Palladium with 2-(3, 5-Dichlor-pyridylazo )-5-dimethylaminoanillne

作　　者：张小玲[1] 闫宏涛[1] 刘根起[1] 

机构地区：[1]西北大学化学系,西安710069

出　　处：《分析化学》2002年第1期75-77,共3页Chinese Journal of Analytical Chemistry

基　　金：陕西省自然科学基金资助项目(No.99H07)

摘　　要：基于２－（３，５－二氯－２－吡啶偶氮）－５－二甲氨基苯胺（３，５－ｄｉＣｌ－ＰＡＤＭＡ）与钯的显色反应，以激光热透镜光谱法测定了微量钯。实验表明：在强酸性介质中，Ｐｄ２＋与３，５－ｄｉＣｌ－ＰＡＤＭＡ室温显色形成稳定的蓝色配合物，最大吸收波长位于６２３ ｎｍ处，与所用激光器输出激光波长匹配较好，从而建立了激光热透镜光谱法测定钯的新方法。把浓度分别在０．００５～０．０４ ｍｇ／Ｌ和０．０３－０．２５ｍｇ／Ｌ范围内呈线性关系，方法灵敏度高，选择性、重现性好，用于样品测定，结果满意。A method for the determination of trace palladium based on the colour reaction between 2-(3,5-dichlorpyridylazo)-5-dimethylaminoaniline (3, 5-diCl-PADMA) and palladium by laser thermal lens spectrometry was proposed. The experimental results show that in strong acidic medium, such as 0.02similar to1.6 mol/L H2SO4, 0.02similar to1.3 mol/L HCl and 1.6similar to4.8 mol/L HClO4, and in the presence of acetone, palladium can react with 3,5-diCl-PADMA to form a stable complex exhibiting an absorption maximum at 623 nm. Based on these characteristics, the tide method was developed. The sensitivity of this method was about 10 times higher than that of conventional spectrophotometric method. The detection limit and linear range of palladium(II) are 0.002 mg/L and 0.005similar to0.25 mg/L respectively. It has been applied to the determination of palladium in alloy and catalyst samples with satisfactory results.

关 键 词：激光热透镜光谱法 2-(3 5-二氯-2-吡啶偶氮)-5-二甲氨基苯胺 钯 显色剂 显色反应 测定 分析 

分 类 号：O657.3[理学—分析化学]