Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillogra...Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillographic characteristic, second order differential oscillographic voltammety is developed for Co 2+ determination. The linear range of the determination of Co 2+ is 2 00×10 -7 ～ 8 20×10 -6 mol/L and the detection limit is 1 00×10 -7 mol/L. RSD is 1 8% for eight successful determinations of 4 20×10 -6 mol/L Co 2+ . Satisfactory results were obtained by this method in determination of VB 12 content in VB 12 injection liquid.展开更多
文摘Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillographic characteristic, second order differential oscillographic voltammety is developed for Co 2+ determination. The linear range of the determination of Co 2+ is 2 00×10 -7 ～ 8 20×10 -6 mol/L and the detection limit is 1 00×10 -7 mol/L. RSD is 1 8% for eight successful determinations of 4 20×10 -6 mol/L Co 2+ . Satisfactory results were obtained by this method in determination of VB 12 content in VB 12 injection liquid.
