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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.
A simple, rapid, sensitive spectrophotometric method has been developed for the determination of platimum in solution. The chromogenic reagent, 5- (4-nitrophenylazo) -8- (ptoluenesulfonamido) quinoline (NPTSQ), reacts with plat- imum (II) in basic medium to form a violet-red: 2 complex with an absorption maximum at 640 nm. The complexation is complete within lmin. Berger’s law is obeyed over the concentration range of 0-25 μg / 25 ml of platinum. The molar absorptivity is 1.37 × 10 ~ 5 l.mol -1 (cm -1) and Sandell sensitivity is 0.0014 μg · cm -2. The effects of pH, surfactant, concentration of the reagent, order of addition of reagents, and the interferences form various ions are investigated. method used een used for the determination of microamount platinum in catalyst andoxidizing-residuum.