铂与NPTSQ的新显色反应的研究及其分析应用(英文)

A simple,rapid,sensitive spectrophotometric method has been developedfor the determination of platimum in solution.The chromogenic reagent,5-(4-nitrophenylazo)-8-(ptoluenesulfonamido)quinoline(NPTSQ),reacts with plat-imum(Ⅱ)almost instantaneously in basic medium to form a violet-red:2 complexwith an absorption maximum at 640 nm.The complexation is complete within lmin.Beer's law is obeyed over the concentration range of 0～25μg/25ml ofplatinum.The molar absorptivity is 1.37×10~5 l.mol~(-1).cm~(-1)and Sandell sensitivity is0.0014 μg.cm~(-2).The effects of pH,surfactant,concentration of the reagent,order ofaddition of reagents,and the interferences form various ions are investigated.The methodhas een used for the determination of microamount platinum in catalyst andoxidizing-residuum.