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利用多巴酚丁胺 (1)的盐酸 (或硫酸 )溶液在铂电极上能催化苯胺氧化的性质对其进行了准确定量测定。在含0 .2 0 mol/ L苯胺的 0 .10 mol/ L HCl(或 0 .0 5 mol/ L H2 SO4)溶液中 ,做循环伏安扫描 ,溶液中的苯胺能还原 1的氧化产物 ,而自身变成氧化态 ,利用它可在 0 .34 5 V(SCE)左右产生一对可逆的氧化还原峰以定量测定 1,线性范围为1.1× 10 - 6～ 3.5× 10 - 4 mol/ L ,检测限为 2 .0× 10 - 7mol/ L。在本试验条件下由于测量峰电位存在显著负移 ,即使存在 10 0倍的抗坏血酸亦不会发生干扰。
The use of dobutamine (1) hydrochloric acid (or sulfuric acid) solution on the platinum electrode can catalyze the aniline oxidation properties of its accurate quantitative determination. Cyclic voltammetric scanning was performed in a solution of 0,10 mol / L HCl (or 0,05 mol / L H2 SO4) containing 0.2 mol / L aniline. The aniline in solution reduced the oxidation product of 1, While it turns into an oxidation state. With it, a pair of reversible redox peaks can be generated at 0. 34 5 V (SCE) for quantitative determination. The linear range is 1.1 × 10 -6 ~ 3.5 × 10 -4 mol / L , The detection limit was 2.0 × 10 -7 mol / L. Under the conditions of this test there is a significant negative shift in the measured peak potential and no interference occurs even in the presence of ascorbic acid at 10 0 times.