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本文研究了在0.004M NH_3—0.01M NH_4Cl底液中砷在同位镀金玻璃碳电极上的线性变势阳极溶出伏安特性。确定了砷的溶出过程是一个不可逆过程。As(Ⅲ)浓度在1×10~(-6)—1×10~(-9)M范围内As的阳极溶出峰电流与As(Ⅲ)浓度有通过原点的线性关系。检测下限为5×10~(-10)M(0.038ppb)。而且消除了Cu~(2+)对测定As(Ⅲ)的干扰。用所研究的方法测定了河水中的As。
In this paper, the linear voltammetric anodic stripping voltammetry of arsenic at the same gold-plated glassy carbon electrode in 0.004M NH 3 -0.01M NH 4 Cl solution was studied. The dissolution of arsenic is determined to be an irreversible process. As (Ⅲ) concentration in the range of 1 × 10 -6 -6 × 10 -9 M As peak anodic dissolution and As (Ⅲ) concentration through the origin of the linear relationship. The detection limit is 5 × 10 -10 M (0.038 ppb). But also eliminate the interference of Cu 2+ for the determination of As (Ⅲ). The As in river water was determined by the method studied.