【作者】 刘往专；

【导师】 吴庆生；

【作者基本信息】 同济大学 ， 无机化学， 2007， 硕士

【摘要】 酚类化合物被广泛用于化工、制药、染料、制革和化妆品等诸多领域。但由于酚类物质有毒且难于降解，所以是一类重要的环境污染物，同时也是环境检测的重要指标。目前，有关酚类物质的测定方法很多，但是对于同分异构体以及结构相似的酚类物质来说尚难以找到快速简便的测定手段。本文分别利用表面活性剂和碳纳米管修饰电极的增敏作用，通过电化学方法实现了多种酚类同分异构体的同时或单独测定。 一、在表面活性剂CPC存在下邻苯二酚和对苯二酚的电化学同时测定。在0.1mol·L^-1 HAc-NaAc（pH 5.6）溶液中，邻对位苯二酚氧化峰重叠，但还原峰却有部分分离，在摸索试验和不断优化条件下，结果发现通过添加表面活性剂在增加检测灵敏度同时进一步增加分离度，通过半微分技术可成功地将邻苯二酚和对苯二酚的还原峰分开。在不需要任何前处理和分离过程，应用未经任何修饰的玻碳电极就可以实现二者的同时测定。对苯二酚和邻苯二酚的线性范围分别为1.2×10^-6～1.0×10^-4mol·L^-1和8.2×10^-7～1.0×10^-4mol·L^-1，检出限分别为3.6×10^-7和2.4×10^-7mol·L^-1。该方法应用于模拟废水中对苯二酚和邻苯二酚的同时测定，回收率为97％-104％。该方法简便、迅速，为酚类同分异构体的同时测定提供了一种新思路。 二、在表面活性剂十六烷基三甲基溴化胺的存在下，实现了a，β-萘酚同分异构体的同时测定。研究发现在表面活性剂存在条件下，a，β-萘酚分别在0.37V和0.55V处出现灵敏的氧化峰。运用半微分技术能够进一步提高分离度，从而实现二者的同时测定。a-萘酚和β-萘酚的线性范围分别为4.3×10^-7～1.0×10^-4mol·L^-1和6.1×10^-7～1.0×10^-4mol·L^-1，检出限分别为3.3×10^-8mol·L^-1和6.7×10^-7mol·L^-1。该方法应用于模拟废水中对苯二酚和邻苯二酚的同时测定，回收率为更多还原

【Abstract】 Phenolic compounds are widely used in many fields, such as chemical industry, pharmaceutical industry, tanning and dyes. They are important environmental pollutants due to their toxicity to human and difficult to degrade. Although there are many ways to determine the phenolic compounds, it is difficult to find a fast and facile one. As a result, it is necessary to establish a sensitive and selective analytical method to detect phenolic compounds. The work is summarized as follows: First, the electrochemical properties of dihydroxybenzene isomers based on glass carbon electrode were investigated. In 0.1 mol-L^-1 HAc-NaAc buffer solution （pH 5.6）, the reduction peaks of p - dihydroxybenzene and o - dihydroxybenzene were partly separated by DPV at the GC electrode. By adding the surfactant of cetyl pyridinium chloride （CPC） to enhance the detection sensitivity and using semi-derivative technique to improve the separation, p- DHB and o - DHB have been detected simultaneously. The linear calibration ranges were 1.2 ×10^-6 to 1.0×10^-4 mol-L^-1 for p - DHB and 8.2×10^-7 to 1.0×10^-7 mol·L^-1 for o - DHB, and with detection limits of 3.6×10^-7 and 2.4×10^-7 mol·L^-1, respectively. This method has been applied to the direct determination of DHB isomers in water sample, and the recovery was from 97 to 104%. This is a simple, fast and convenient method. And this also provided a new idea for direct determination of phenolic compounds. Second in the presence of cetyltrimethyl ammonium bromide （CTAB）, the electrooxidation of naphthol isomers were studied by cyclic voltammetry on the GC electrode. Two well-defined oxidation peaks at 0.37 V and 0.55V were obtained. By using semi-derivative technique to improve the separation, a-naphthol and 8-naphthol have been detected simultaneously. The linear calibration ranges were 4.3×10^-7 to更多还原