1989 Volume 5 Issue 5 Pages 563-566
In a 0.3M sodium hydroxide medium there is a well-defined single-sweep polarographic wave for a Cd(II)-3-hydroxy-1-p-sulfonatophenyl-3-phenyl triazene complex which can be used for the determination of trace amounts of cadmium. The complex, corresponding to Cd(HSPT)2 with a conditional formation constant log β′=9.20, can be strongly adsorbed on the surface of a mercury electrode; the polarographic wave is attributed to the reduction of Cd(II) in the adsorbed complex to Cd(Hg). The linear range for the polarographic wave is from 1×10-8 to 1×10-6 M and the detection limit is 6×10-9M. The relative standard deviation is 1.5% and the regression correlation coefficient is 0.998. Most common metal ions show no, or little, effect on the determination. This method has been applied for the analysis of waste water and biological samples.
