新试剂N—壬基—N‘—（氨基对苯磺酸钠）硫脲（NPT）与钯（Ⅱ）显色？…

研究新合成的水溶性光度试剂Ｎ－壬基－Ｎ‘－（氨基对苯磺酸钠）硫脲与钯的显色反应。结果表明，在ｐＨ５．８－６．６的ＨＡｃ－ＮａＡｃ缓冲体系中，Ｐｄ＾２＋与ＮＴＰ形成１：４的黄色水溶性配合后物，ＣＴＭＡＢ对反应有明显的增敏作用，配合物的最大吸收波长位于２９７．６ｎｍ，表面摩尔吸光系数ε２９７．６＝１．２７×１０＾５Ｌ．ｍｏｌ＾－１ｃｍ＾－１，钯含量在２－１１．２μｇ／２５ｍＬ范围内服从比尔定律，５０种

The study of the colour reaction of new reagent N-nonyl-N'-(sodium p-aminobenzenesulfonate) thiourea (NPT) on Pd(II) and its application]

In this work, the colour reaction of Pd(II) on water-soluble spectrophotometric reagent N-Nonyl-N'-(Sodium p-Aminobenzenesulfonate) thiourea (NPT) which is newly synthesized has been studied. The result indicates that Pd(II) reacts on NPT form a yellow water-soluble complex with the proportion of 1:4 in HAc-NaAc buffer solution at pH5.8-6.6. The presence of CTMAB makes a synergistic sensitizing effect on the reaction,the complex exhibits a maximum absorption wavelength at 297.6nm, apparent molar absorptivity epsilon97.6 = 1.27 x 10(5) L x mol(-1) x cm(-1). Beer's law is obeyed when concentration of Pd is within the range of 2-11.2 microg/25 mL, 50 kinds of ions do not influence the determination. It shows NPT is one of the best reagents on its sensitivity and selectivity in the determination of Pd(II). This method obtains satisfying result when using in the determination of Pd in anode mud and catalyst.