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
Solid liquid extraction of copper ion (I) with 2, 9-dimethyl-1, 10-phenanthroline (neo-cuproine, DMP) into molten naphthalene followed by chloroform spectrophotometric determination has been studied experimentally. Th...Solid liquid extraction of copper ion (I) with 2, 9-dimethyl-1, 10-phenanthroline (neo-cuproine, DMP) into molten naphthalene followed by chloroform spectrophotometric determination has been studied experimentally. The ternary complex Cu(I)-DMP-ClO4 was extracted quantitatively into molten naphthalene in the range of pH from 5 to 6 at 85 C-. Absorbance was spectrophotometrically determined at 459 nm against the reagent blank after the solid naphthalene layer was anhydrously dissolved in chloroform. Beer's law is obeyed over a concentration range of 0.5-70 mug/mL. The molar absorptivity and Sandell's sensitivity are 1.0x10(4) L/(mol(.)cm) and 0.0099 mug(.)cm(2) respectively. In addition, the various conditions on determination and the interference of coexisted ions were discussed, and the method was applied to the determination of copper ion both in tea samples and cadmium sulfate reagents. The results are in good agreement with those obtained by ICP AES method.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.
基金This research was financially supported by the project KJCXGC-01 of Northwest Normal University, China.
文摘Solid liquid extraction of copper ion (I) with 2, 9-dimethyl-1, 10-phenanthroline (neo-cuproine, DMP) into molten naphthalene followed by chloroform spectrophotometric determination has been studied experimentally. The ternary complex Cu(I)-DMP-ClO4 was extracted quantitatively into molten naphthalene in the range of pH from 5 to 6 at 85 C-. Absorbance was spectrophotometrically determined at 459 nm against the reagent blank after the solid naphthalene layer was anhydrously dissolved in chloroform. Beer's law is obeyed over a concentration range of 0.5-70 mug/mL. The molar absorptivity and Sandell's sensitivity are 1.0x10(4) L/(mol(.)cm) and 0.0099 mug(.)cm(2) respectively. In addition, the various conditions on determination and the interference of coexisted ions were discussed, and the method was applied to the determination of copper ion both in tea samples and cadmium sulfate reagents. The results are in good agreement with those obtained by ICP AES method.
