六氰合铁（Ⅱ）酸铁（Ⅲ）/全氟磺酸-聚四氟乙烯共聚物复...
六氰合铁（Ⅱ）酸铁（Ⅲ）/全氟磺酸-聚四氟乙烯共聚物复合膜修饰玻碳电极差分脉冲伏安法测定铅和镉刘雪 王兰 吴志伟 骆定法 黄克靖信阳师范学院化学化工学院,河南信阳464000
摘 要:利用电聚合的方法将普鲁士蓝修饰到玻碳电极表面,然后修饰上全氟磺酸-聚四氟乙烯共聚物（Nafion）膜制成修饰电极。利用差分脉冲伏安法（DPV）对Pb2＋和Cd2＋在该修饰电极上的电化学行为进行了研究,建立了差分脉冲伏安法灵敏测定Cd2＋和Pb2＋的新方法。对富集电位、富集时间以及Nafion用量等实验条件进行了优化。在0.1mol/L pH 4.5的NaAc-HAc缓冲液中,在-1.1V处搅拌富集450s,用DPV分别测定-0.48V和-0.73V处的氧化峰电流。溶出峰电流与Pb2＋和Cd2＋的浓度分别在5×10-8～5×10-5 mol/L和2×10-8～2×10-5 mol/L范围内呈良好的线性关系,相关系数分别为0.995和0.992。检出限分别为5×10-9 mol/L（Pb2＋）和2×10-9 mol/L（Cd2＋）（S/N=3）。方法用于水样中Cd2＋和Pb2＋的测定,测定值与原子吸收光谱法的结果相一致,相对标准偏差为2.1%～3.8%。[著者文摘]
关键词:普鲁士蓝 全氟磺酸-聚四氟乙烯共聚物（Nafion） 差分脉冲伏安法 铅 镉 化学修饰电极
Determination of lead and cadmium by differential pulse voltammetry based on hexakis（cyano-C）-iron potassium/Perfluorosulfonic acid-PTFE copolymer composite film modified glassy carbon electrodeLIU Xue,WANG Lan,WU Zhi-wei,LUO Ding-fa,HUANG Ke-jingDepartment of Chemistry,Xinyang Normal University,Xinyang 464000,ChinaAbstract:A modified electrode was prepared with glassy carbon electrode through modification first with Prussian blue by electro-polymerization method and then with Perfluorosulfonic acid-PTFE copolymer（Nafion） film.The electrochemical behavior of Pb2＋ and Cd2＋ on the prepared electrode was studied by differential pulse voltammetry（DPV）.A new determination method of Pb2＋ and Cd2＋ with high sensitivity was established.The experimental conditions such as accumulation potential,accumulation time and Nafion dosage were optimized.After stirring and accumulation at-1.1 V for 450 s in 0.1 mol/L NaAc-HAc buffer solution at pH 4.5,the oxidation peak currents at-0.48 V and-0.73 V were measured with DPV,respectively.The stripping peak current showed good linearity to the concentration of Pb2＋ and Cd2＋ in the range of 5×10-8-5×10-5 mol/L and 2×10-8-2×10-5 mol/L,respectively.The correlation coefficients were 0.995 and 0.992,respectively.The detection limits were 5×10-9 mol/L for Pb2＋ and 2×10-9 mol/L for Cd2＋（S/N=3）.The proposed method was applied to the determination of Cd2＋ and Pb2＋ in water sample.The results were consistent with those obtained by atomic absorption spectrometry,and the relative standard deviation（RSD） was 2.1 %-3.8 %.[著者文摘]
Key words: Prussian blue; Perfluorosulfonic acid-PTFE copolymer（Nafion）; differential pulse voltammetry; lead; cadmium; chemical modified electrode
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