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基于Au—S化学键的作用,在金电极表面组装L-半胱氨酸(L-Cys),再利用结晶紫(Crystal violet)与L-半胱氨酸之间的静电作用,将结晶紫间接的组装在金电极表面,从而形成结晶紫修饰电极,利用差分脉冲伏安法将所修饰结晶紫电极对水中重金属中镉离子的测定。结果表明,在pH=8.0磷酸缓冲液中,结晶紫修饰电极对Cd2+在0.25×10-6~1.25×10-6g/L范围内具有良好线性关系,其标准曲线:ΔI=I-I0=1 100.3C+34.048(C的单位为10-6g/L),相关系数R2=0.992 6,检出限为7.63×10-5g/L,并且该电极有良好的灵敏度和识别性。
Based on the Au-S chemical bond, L-cysteine (L-Cys) was assembled on the surface of the gold electrode, and then the electrostatic interaction between crystal violet and L-cysteine was utilized to indirectly Was assembled on the surface of the gold electrode to form a crystal violet modified electrode, and the modified crystal violet electrode was used to measure the cadmium ions in the heavy metal by differential pulse voltammetry. The results showed that there was a good linear relationship between the crystal violet modified electrode and Cd2 + in the range of 0.25 × 10-6 ~ 1.25 × 10-6g / L in pH = 8.0 phosphate buffer solution. The standard curve was: ΔI = I-I0 = 1 100.3C + 34.048 (the unit of C is 10-6g / L), the correlation coefficient R2 = 0.992 6, the detection limit of 7.63 × 10-5g / L, and the electrode has good sensitivity and identification.