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本文提出了应用溶出催化法测量微量砷的方法。10~3mol/m~3HCl──1.5×10~(-2)mol/m~3 Au(Ⅲ)的底液中,将As(Ⅲ)电解富集在同位镀金的玻碳电极上,然后在0.5×10~3mol/m~3HCl──2.5×10~3mol/m~3 HClO_4──0.5mol/m~3 SnCl_2的催化体系中溶出催化,得到一灵敏的溶出催化波2×10~(-6)mol/m~3──4×10~(-5)mol/m~3的砷有良好的线性关系,检出下限为4×10~(-7)mol/m~3,本法对天然水进行测定回收率为100±10%内。
In this paper, a method for the determination of trace arsenic by using dissolution catalysis is proposed. As (Ⅲ) is electrolytically enriched in the same gold-plated glassy carbon electrode in the bottom liquid of 10-3 mol / m ~ 3HCl ─ 1.5 × 10 -2 mol / m ~ 3 Au (Ⅲ) 0.5 × 10 ~ 3mol / m ~ 3HCl──2.5 × 10 ~ 3mol / m ~ 3 HClO_4──0.5mol / m ~ 3 SnCl_2 was used as catalyst for catalysis. A sensitive catalytic dissolution wave of 2 × 10 ~ 6) mol / m ~ 3───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── The determination of natural water recovery was 100 ± 10%.