THE POLAROGRAPHIC CATALYTIC WAVE OF COMPLEX OF Ga AND CUPFERRON
Zhang Shuyun and Xu Keli (Northwestern Textile Institute, Xi' an)
In this paper, the oscillopolarographic behaviour of the adsorptive catalytic wave of Gallium has been studied. It is found that Ga can be determined from the height of a catalytic wave at -0.92 (vs. SCE) in the formic acid and ammonium formate buffer solution with cupferron. The optimum conditions are 0.15M HCOOH, 0.05M HCOONH4, 8.0×l0-5M cupferron and pH = 2.6-3.0. The calibration graph covers the range 7.2×10-8M-3.6×10-8M-Ga. The nature of the catalytic wave was considered to be the adsorptive complex wave of Ga with cupferron.