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在铜或硒存在下利用悬汞电极阴极溶出测定砷已见报道,但使用玻碳电极进行砷的测定尚属少见。砷的阳极溶出法因汞电极中汞的氧化干扰而无法进行。本实验采用就地镀铜玻碳电极作工作电极成功地进行砷的阳极溶出法测定。 (一)操作步骤加入适量的砷、铜及硫酸溶液到50ml容量瓶中使砷的最终浓度为1.0×10~(-7)mol/L-9.0×10~(-6)mol/L,铜(Ⅱ)为4.0×10~(-6)mol/L,硫酸为0.6mol/L。将溶液转入石英电解池中,通氮除氧5min,在-0.60V沉
Determination of arsenic by cathodic dissolution of hanging mercury electrode in the presence of copper or selenium has been reported, but the determination of arsenic using glassy carbon electrode is still rare. The arsenic anodic dissolution method can not be carried out due to the oxidation of mercury in the mercury electrode. In this experiment, arsenic anode anodic stripping method was successfully applied to the working electrode with copper-plated glassy carbon electrode in situ. (A) Procedure Add arsenic, copper and sulfuric acid solution to a 50ml volumetric flask to make the final concentration of arsenic 1.0 × 10 -7 mol / L-9.0 × 10 -6 mol / L, (Ⅱ) is 4.0 × 10 -6 mol / L, and sulfuric acid is 0.6 mol / L. The solution into the quartz cell, through nitrogen deoxy 5min, at -0.60V Shen