Tast polarography, differential pulse polarography and cyclic voltammetry were applied to the examination of 7 derivatives of 3-carboxy-4-hydroxy-6-acetylaminoazobenzene with H, CH3, OCH3, Cl, COCH3, NO2 and NHCOCH3 substituents in position 4'. A general reduction mechanism was suggested for the substances. The half-wave potentials obtained from tast polarographic measurements were correlated with the Hammett σ constants of the substituents in the para-position. The plot of this dependence is linear, which suggests that the reduction mechanism is identical within the entire series. The optimum conditions for quantitation of the substances were found within the concentration regions of 1 .10-4 to 1 .10-6 mol l-1 for tast polarography and 1 .10-4 to 1 .10-7 mol l-1 for differential pulse polarography.
巴斯德极谱法、差分脉冲极谱法和循环伏安法被应用于检测7种3-羧基-
4-羟基-6-乙酰
氨基
偶氮苯衍
生物,其中在4'位带有H、CH
3、OCH
3、Cl、COCH
3、NO
2和NHCOCH
3取代基。对这些物质提出了一个通用的还原机理。从巴斯德极谱测量中得到的半波电位与取代基在对位的Hammett σ常数相关。这种依赖关系的图是线性的,这表明整个系列内的还原机理是相同的。在1.10
-4至1.10
-6 mol l
-1的浓度范围内,巴斯德极谱法和1.10
-4至1.10
-7 mol l
-1的浓度范围内,找到了最佳的物质定量条件。