【摘要】 报道了一种高灵敏度 ,快速测定水体中铜离子的化学修饰碳糊电极。详细研究了测定铜离子的条件。该修饰电极测定铜离子的线性范围为 1× 1 0 - 9～ 1 .5× 1 0 - 7mol/L ,富集 6min后的检出限为 3× 1 0 - 10 mol/L。该方法简便、快速、灵敏。用该修饰电极测定了实际水样中的铜离子 ,平均回收率为 1 0 0 .8%。更多还原

【Abstract】 A sodium montmorillonite (SWy 2) modified carbon paste electrode was examined for the determination of trace levels of Cu 2+ . Due to its strong cation exchange and adsorptive characteristics, SWy 2 greatly imprioved the sensitivity of determination of Cu 2+ . Cu 2+ was preconcentrated and reduced on the modified electrode surface at -0.70 V, and then stripped from the electrode surface during the positive potential sweep. The determination parameters, such as supporting electrolyte, pH value, the amount of SWy 2, accumulation potential and time were optimized. The peak current was linear with the concentration over the range from 1×10 -9 mol/L to 1.5×10 -7 mol/L. The detection limit (signal to noise=3) was 3×10 -10 mol/L after 6 min accumulation. Using the SWy 2 modified carbon paste electrode, Cu 2+ in the water samples was detected with the average recovery of 100.8%.更多还原