A new and convenient method for the rapid determination of trace amounts of
nickel in waste solution obtained by cleaning diamond with HNO3 using seco
nd order differential a. c. oscillopolarography in 0.20 mol/L NH4Ac-0.005 m
ol/L KNO3-0.02% diacetyldioxime solution is described in this paper. Experi
mental conditions were optimized including component and concentration of b
ase solution, the area of hanging mercury drop electrode, the intensity of
direct current and alternative current and so on. The calibration graph is
linear from 3 x 10(-7) to 3.5 x 10(-6) mol/L with a detection limit of 6 x
10(-8) mol/L. The relative standard deviation of the method is 1.2% for 1.8
x 10(-6) mol/L Ni2+. Compared with polarographic analysis and other techni
ques, the main advantages of the technique are cheap equipment, rapid measu
rement, high sensitivity and good adaptability for analysis of air-saturate
d samples.