铊(Ⅰ)-碘化钾-向红菲啰啉络合吸附波的研究

Studies on The Polarographic Adsorptive Wave of the Thallium(Ⅰ)\|Potassium Iodide\|4,7\|Diphenyl\|1,10\|Phenanthro\|line Complex

在Ｎａ２Ｂ４Ｏ７－ＮａＯＨ 介质（ｐＨ １０．８）中，可获得灵敏的铊（Ⅰ）－碘化钾－向红菲口罗啉极谱络合吸附还原波，其二阶导数波灵敏度高、波形好，峰电位在－ ０．５８ Ｖ 处（ｖｓ．ＳＣＥ）。波高与铊（Ⅰ）浓度在２．０×１０－ ８～９．０×１０－ ７ ｍ ｏｌ·Ｌ－ １范围内呈线性关系， 检出限１．０×１０－ １０ ｍ ｏｌ·Ｌ－ １。本法用于测定工厂废水中的痕量铊，结果满意。本文还对极谱波的性质和机理进行了研究。

In a supporting electrolyte containing Na\-2B\-4O\-7\|NaOH (pH=10.8), a sensitive adsorptive polarography wave of thallium(Ⅰ) complex was obtained. The peak appered at 0.58 V(vs.SCE). The linear relationship between the peak current and the thaullium(Ⅰ) concentration was in the range of 2.0×10\+\{-8\}~9.0×10\+\{-7\} mol/L with a detection limit of 1×10\+\{-10\} mol/L. The proposed method has been applied to the determination of trace amount of thallium(Ⅰ) in industrial waste water with satisfactory results. The polarographic wave mechanism has also been discussed.