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提出了一种铟(Ⅲ)-二甲酚橙在导数示波极谱中的络合吸附波,文献未见报道。实验表明,在HCl(pH=3)底液中二甲酚橙在—0.41 V(SCE)处有一个稳定的还原波P_1,当加入In~(3+)后在较负的电位(—0.55V)处出现一个新波P_2,P_2的峰高随In~(3+)浓度的增加而增加。最低检出限可达0.003μg/ml。In~(3+)的浓度在7.0×10~(-3)～1.6×10_(-6)M范围内与P_2峰高呈线性关系。用本法测定粉煤灰和锌粒中的微量铟,取得了满意的结果。
A complex absorption wave of indium (Ⅲ) -xylenol orange in derivative oscilloscope polarography was proposed, but no literature has been reported. Experiments show that xylenol orange has a stable reduction wave P_1 at -0.41 V (SCE) in the HCl (pH = 3) bottom liquid, and at a more negative potential (-0.55 V), a new wave P_2 appears. The peak height of P_2 increases with the increase of In 3+ concentration. The lowest detection limit of up to 0.003μg / ml. The concentration of In ~ (3+) showed a linear relationship with the peak height of P_2 in the range of 7.0 × 10 -3 ~ 1.6 × 10 -6 M. The determination of trace indium in fly ash and zinc granules by this method has achieved satisfactory results.