An effective Spectrophotometric determination of platinum withl-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent was studied. A green complexof platinum with PAN is formed at 90℃. In the range of...An effective Spectrophotometric determination of platinum withl-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent was studied. A green complexof platinum with PAN is formed at 90℃. In the range of pH 2.5-6.5, the complex is quantitativelyextracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl_3 to hedetermined spectrophotometrically at 690 nm against the reagent blank. Beer's law is obeyed over theconcentration range of 0.5-5.0 μg/μL. The molar absorptivity and Sandell's sensitivity are 1.6 x10^5 L·mol^(-1)·cm^(-1) and 0.0048 mg·cm^(-2), respectively. The optimum conditions fordetermination are obtained. The interferences of various ions are observed in detail. The method hasbeen applied to the determination of platinum in synthetic samples.展开更多
基金This work is financially supported by the Natural Science Foundation of Longdong University (No. SZZK0202)
文摘An effective Spectrophotometric determination of platinum withl-(2-pyridylazo)-2-naphthol (PAN) using molten naphthalene as a diluent was studied. A green complexof platinum with PAN is formed at 90℃. In the range of pH 2.5-6.5, the complex is quantitativelyextracted into molten naphthalene. The organic phase is anhydrously dissolved in CHCl_3 to hedetermined spectrophotometrically at 690 nm against the reagent blank. Beer's law is obeyed over theconcentration range of 0.5-5.0 μg/μL. The molar absorptivity and Sandell's sensitivity are 1.6 x10^5 L·mol^(-1)·cm^(-1) and 0.0048 mg·cm^(-2), respectively. The optimum conditions fordetermination are obtained. The interferences of various ions are observed in detail. The method hasbeen applied to the determination of platinum in synthetic samples.
