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本文发现THAQ于酸性介质中,若先用NaNO_2反应,在硼酸缓冲溶液(pH12.56)中,获得Zr(Ⅳ)-THAQ络合物电流峰(Ep-0.8V,对SCE),其峰高和锆浓度在2×10~(-7)一5.5×10~(-6)范围内成正比。检测下限为20ppb Zr(Ⅳ)。建立了示波极谱法测定钢铁合金中微量(>0.0005％)锆的新方法。操作简便,无毒,结果准确满意。经实验求得Zr(Ⅳ)-THAQ络合物组成比为1:2或1:4;相应的络合物稳定常数β_1=7.1×10~(10),β_2=8.9×10~(21)。结果表明Zr(Ⅳ)-THAQ电流峰具有吸附特征。
In this paper, we found that the THAQ peak (Ep-0.8V, vs SCE) of Zr (Ⅳ) -THAQ complex was obtained in NaBr buffer solution (pH12.56) And zirconium concentration in the 2 × 10 -7 -7 5.5 × 10 -6 (-6) is proportional to the range. The lower limit of detection is 20 ppb Zr (IV). A new method for determining trace (> 0.0005%) zirconium in steel alloy by oscillopolarography was established. Easy to operate, non-toxic, accurate and satisfactory results. The composition ratio of Zr (Ⅳ) -THAQ complex was 1: 2 or 1: 4. The corresponding stability constants of β1 = 7.1 × 10-10, β_2 = 8.9 × 10-21, . The results show that Zr (Ⅳ) -THAQ current peak has adsorption characteristics.