Study on the determination of trace rhenium(Ⅶ)by the adsorption differential pulse polarography

The determination of trace rhenium（Ⅶ）by differential pulse polarography in the systemof HSO-（NHOH）·HSO-TeOis markedly improved by the addition of Nitron,which is adsorbedon the surface of mercury electrode.The limit of detection is down to 2×10M.The adsorptivepeak potential is -0.80V（vs.SCE）.In the ranges of 5×10-10,1×10-10and 1×10-10M,there are good linear relationships between the peak current increment and theconcentration,of which the relative standard deviations are 9.5,6.6,1.8% respectively with thecorrelation coefficients of linear regression of 0.995—0.999.The results relating to this polarographicwave show that it is an adsorption-catalytic wave.The mechanism of the electrode reaction is dis-cussed.