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将谷胱甘肽(GSH)自组装膜修饰电极用于Cr(Ⅵ)的测定.实验表明,在0 02mol/LH2SO4+0 1mol/LNaNO3溶液中,在+1 00～-0 40V电位范围内进行循环伏安扫描,于+0 29V(Vs.SCE)处获得铬的还原峰信号、+0 65V(Vs,SCE)处获得铬的氧化峰信号.Cr(VI)在GSH/Au修饰电极上的电化学行为比裸金电极有明显的改善,峰电流更为灵敏,且还原峰电流随着Cr(VI)浓度的增加而增大,因此选择+0 29V的还原峰作为分析信号,运用1 5次微分线性扫描伏安法对铬进行了定量分析,线性范围为1 0×10-8～1 0×10-6mol/L,检测限为1 0×10-9mol/L.将所建立的方法应用于湖水样品中铬含量的测定,以ICP进行对照实验,结果满意.
Glutathione (GSH) self-assembled monolayers modified electrode was used for the determination of Cr (Ⅵ) .It was shown that in 0.02mol / LH 2 SO 4 + 0 1mol / L NaNO 3 solution, Cyclic voltammetric scan was performed to obtain the reduction peak of chromium at +0 29V (Vs.SCE) and the oxidation peak of chromium at +0 65V (Vs, SCE) .Cr (VI) was detected on GSH / Au modified electrode The electrochemical behavior is obviously improved compared with the bare gold electrode, the peak current is more sensitive, and the reduction peak current increases with the increase of Cr (VI) concentration. Therefore, the reduction peak of +0 29V is selected as the analysis signal, The linear differential scanning calorimetry was used for the quantitative analysis of chromium, with a linear range of 10 × 10 -8 ~ 10 × 10 -6 mol / L and a detection limit of 10 × 10 -9 mol / L. The established method The method was applied to the determination of chromium in lake water samples. The control experiment was conducted with ICP and the results were satisfactory.