表面活性剂增强下萘酚异构体的电化学快速测定  

Simultaneous Determination of Naphthol Isomers under the Enhancement of Surfactant with Electrochemical Method

作　　者：王晓岗 刘往专[1] 吴庆生[1] 丁亚平[2] 樊雅娟[1] 

机构地区：[1]同济大学化学系,上海200092 [2]上海大学化学系

出　　处：《应用化学》2007年第9期996-999,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20471042);教育部博士点基金(20040247045)资助项目

摘　　要：建立了一种同时检测萘酚同分异构体的方法。在浓度为0.1mol/L、pH=8.0的磷酸钠缓冲液中,采用微分脉冲方法研究了萘酚在玻碳电极上的电化学行为。结果显示,1-萘酚、2-萘酚均产生1个非可逆的氧化峰,且这2个氧化峰在底部形成重叠。1-萘酚的存在对2-萘酚的测定形成干扰,通过半微分技术处理,2种物质的氧化峰信号完全分离,同时采取向溶液中添加表面活性剂的方法来提高检测的灵敏度,在1.2×10-4mol/L十六烷基三甲基溴化胺存在条件下,1-萘酚和2-萘酚的半微分氧化电流分别提高到2.2和1.9倍。探讨了表面活性剂的增敏机理,实现了萘酚异构体的同时检测。在9.2×10-7～2.0×10-4mol/L范围内,1-萘酚的半微分电流与其浓度呈良好的线性关系,2-萘酚的线性范围为1.3×10-6～2.0×10-4mol/L,二者的检测限分别为3.2×10-7和4.3×10-7mol/L。进行了重现性及干扰实验,并对模拟水样中的萘酚进行了测定,回收率在97.7%～104.0%。A fast and convenient analytical technique was suggested to detect naphthol isomers directly and simultaneously. In 0. 1 mol/L sodium phosphate buffer solution （ pH = 8.0） , the electrochemical behaviors of 1-naphthol and 2-naphthol were investigated with differential pulse voltammetry method at the glassy carbon electrode. Each of them exhibited an irreversible oxidation peak, and the two oxidation peaks overlapped partly in the base, meaning that the presence of 1-naphthol would interfere with the determination of 2-naphthol. Via semi-derivative technique, the two oxidation peaks were separated completely and did not overlap any more. Meanwhile, the surfactant of cetyl pyridinium chloride （CTAB） was used to enhance the detection sensitivity. The semi-derivative oxidation currents of 1-naphthol and 2-naphthol increased 2.2 and 1.9 times respectively in the presence of 1.2 × 10^-4 mol/L of CTAB. The enhancement mechanism of surfactant was also studied, and both 1-naphthol and 2-naphthol were detected simultaneously. The linear calibration ranges were 9.2 × 10^-7 to 2.0 × 10^-4 mol/L for 1-naphthol and 1.3 × 10^-6 to 2.0 × 10^-4 mol/L for 2-naphthol, and with detection limits of 3.2× 10^-7 and 4.3× 10^-7 mol/L, respectively. The reproducibility and interference tests were performed. This method was also applied to the determination of naphthol isomers in simulated water samples, and the recovery was from 97.7% to 104.0%.

关 键 词：萘酚同分异构体 同时测定 表面活性剂 半微分伏安法 

分 类 号：O657.1[理学—分析化学]