以碳纳米管-氨基硫脲复合物为载体的碳糊铁离子选择性电极研究

Study on a carbon paste iron(Ⅲ)-selective electrode based on the composite of carbon nanotube-thiosemicarbazide as the carrier

以碳纳米管-氨基硫脲复合物为载体制成碳糊电极,该电极对铁离子具有选择性的Nernst电位响应,其线性范围为3.5×10^-7-1.0×10^-1mol/L,斜率为30.7 mV/decade,检测下限为1.0×10^-7 mol/L。该电极对Fe^3＋的响应时间为15 s,其选择性良好,并能成功应用于Fe^3＋的回收率实验。

A new modified carbon paste electrode based on the composite of carbon nanotube-thiosemicarbazide as the carrier was prepared. The electrode exhibits a selective Nernst-potential slope of 30.7 mV/decade for Fe3＋over a linear range of 3.53.5×10^-7-1.0×10^-1mol/L mol/L. The detection limit of the electrode is 1.0 ×10^-7 mol/L. The response time of the electrode is 15 s. The electrode shows a good selectivity for Fe^3＋and it can be successfully applied to the recovery of determination of Fe^3＋.