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本文提出了用铅离子选择电极和(CH_2)_6N_4—HCHO—Trien—KNO_3离子液,采用直接电位法测定Cu~(2+)、Fe~(3+)、Hg~(2+)、Ag~+等存在下的微量铅。方法简便,快速,准确。文中对测定条件进行了考察,测定范围为1×10~(-3)～2×10~(-7)MPb~(2+)有线性关系。方法的精密度5.9％,回收率为99～109％。检测下限0.02ppm,测定结果与原子吸收法和极谱催化波结果颇为接近。此法适用于工业废水中微量铅的测定。
In this paper, the determination of Cu2 +, Fe3 +, Hg2 +, Ag2 +, Cu2 +, Cu2 +, Cu2 +, Cu2 +, Cu2 + and Cu2 + using the lead ion selective electrode and (CH_2) _6N_4-HCHO-Trien- +, Etc. exist in the trace lead. The method is simple, fast and accurate. In this paper, the determination of the conditions were investigated, the determination of the range of 1 × 10 ~ (-3) ~ 2 × 10 ~ (-7) MPb ~ (2) a linear relationship. The precision of the method was 5.9% and the recovery was 99-109%. Detection limit of 0.02ppm, the measured results and atomic absorption spectrometry and polarographic catalytic wave results quite close. This method is suitable for the determination of trace lead in industrial wastewater.