Determination of Novalgin by Single-Sweep Oscillopolarography
ZHANG Jun, LI Ju nan *, WU Wen bo (College of Chemistry and Chemical Engineering, Xiangtan University, Xiangtan, 411105)
A method for the determination of novalgin has been described. Novalgin was oxidized by iodine in acidic solution and a sensitive reduction wave of its oxidation product was obstained at-0.76 V ( vs.SCE ) by single sweep oscillopolarography in NH 3·H 2O NH 4Cl buffer solution (pH=11.0). An excellent linear relationship between the peak height and the concentration of novalgin has been found in the range of 0.01～3 μg/mL. The detection limit was 0.005 μg/mL. Furthermore, the polarographic behaviour and the electrode reaction mechanism of its oxidation product were studied. The methods has been applied to the determination of novalgin in tablet with satisfactory results.