论文部分内容阅读
用脱乙酰壳多糖化学修饰电极为工作电极 ,阳极溶出伏安法测定痕量银。在 p H4.0的0 .1 mol· L-1邻苯二甲酸氢钾和 0 .1 mol· L-1硫氰化铵溶液中 ,起始电位 - 0 .80 V,终点电位+0 .5V,富集时间 3min,以 0 .1 V·s-1扫速阳极溶出 ,峰电位在 - 0 .0 75V(vs.Ag/Ag Cl) ,银浓度在0 .0 2～ 1 .0 μg· ml-1范围内与峰高呈线性关系 ,提高了测定灵敏度 ,用于矿样测定 ,无需分离 ,结果满意。用紫外光谱和拉曼光谱研究了该法的电极过程机理
Chitosan chemically modified electrode as the working electrode, anodic stripping voltammetry for the determination of trace silver. In p H4.0 0 .1 mol · L-1 potassium hydrogen phthalate and 0.1 mol · L-1 ammonium thiocyanate solution, the initial potential of -0.80 V, the end potential of +0. 5V, the enrichment time was 3min, the rate of anodic dissolution was 0.1V · s-1, the peak potential was -0.075V (vs.Ag / AgCl), the concentration of silver was0.2 ~ 1.0 μg · Ml-1 range and the peak height of a linear relationship to improve the determination of sensitivity for the determination of ore samples, without separation, the results are satisfactory. The electrode process of this method was studied by UV and Raman spectroscopy