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The determination of trace rhenium(Ⅶ)by differential pulse polarography in the systemof H_2SO_4-(NH_2OH)_2·H_2SO_4-TeO_4~(2-) is markedly improved by the addition of Nitron,which is adsorbedon the surface of mercury electrode.The limit of detection is down to 2×10~(-10) M.The adsorptivepeak potential is -0.80V(vs.SCE).In the ranges of 5×10~(-10)-10~(-8),1×10~(-8)-10~(-7) and 1×10~(-7)-10~(-6)M,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.
The determination of trace rhenium (Ⅶ) by differential pulse polarography in the system of H_2SO_4- (NH_2OH) _2 · H_2SO_4-TeO_4 ~ (2-) is markedly improved by the addition of Nitron, which is adsorbedon the surface of mercury electrode. Limit the detection is down to 2 × 10 -10 M. The adsorptivepeak potential is -0.80V (vs.SCE) .In the ranges of 5 × 10 -10 -10 -8, 1 × There are good linear relationships between the peak current increment and the concentration, of which the relative standard deviations are 10 ~ (-8) -10 ~ (-7) and 1 × 10 ~ (-7) -10 ~ (-6) M 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.