摘要
本文报道了新试剂２－（４－苯基－２－噻唑偶氮）－５－［（Ｎ，Ｎ－二羧基甲基）氨基］苯甲酸的合成及其与金属离子的显色反应。详细讨论该试剂与钯显色反应的最适条件，在酸性条件下，试剂与钯形成２：１蓝色络合物，其稳定常数Ｋ＿稳＝５．３９×１Ｏ￣（１１），采用双波长法测定，络合物的摩尔吸光系数ε＿（６７６．４－４８６．０）＝５．６１×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），比单波长测定的灵敏度（ε＿（６７６．４＝３．５８×１０￣４）提高了５７％。试剂的灵敏度高，选择性好，可直接用于铂－钯催化剂中微量他的测定，结果满意。
In this paper the synthesis of 2-(4-benz-2-thiazolylazo )-5-[(N, N-dicarboxylmethyl)amino] benzoic acid(PTADCAB) is reported.Its dissociatiOn constants were determined byspectrophotometry.The color reactions of thereagent with metals were studied.The opti-mum conditions of PTADCAB with paliadiumwere investigted in detail.Ablue complex wasformed in acid medium and its stabillitv con-stant was 5. 39 × 10￣(11).The apparent molar ab-sorptivity was 5. 61 × 10￣4 L·mol￣(-1)·cm￣(-1) bydualwavelength spectrophotometry. Thereagent has a high sensitivity and good selec-tivitv,The proposedmethod wasdirectly usedto determine trace palladium in PtPdcatalystand the results were satisfactory.
出处
《分析试验室》
CSCD
北大核心
1996年第5期1-5,共5页
Chinese Journal of Analysis Laboratory
基金
浙江省分析测试基金
