摘要
用循环伏安法制备了银掺杂聚L-甲硫氨酸修饰玻碳电极,研究了对苯二酚和邻苯二酚在该修饰电极上的电化学行为,建立了同时测定对苯二酚和邻苯二酚的新方法。研究发现,在pH=5.0的磷酸盐缓冲溶液中,扫速为100 mV/s时,对苯二酚和邻苯二酚在银掺杂聚L-甲硫氨酸修饰玻碳电极上均出现1对氧化还原峰,峰电位分别为:Epa=0.228 V、Epc=0.162 V和Epa=0.347 V、Epc=0.287 V,二者的氧化峰电位差达119 mV,还原峰差达125 mV。在最佳的条件下,用差分脉冲伏安法同时测定邻苯二酚和对苯二酚的线性范围为3.00×10-6～1.00×10-4 mol/L,检出限为8.0×10-7 mol/L(对苯二酚)和5.0×10-7 mol/L(邻苯二酚)。此法用于废水样中对苯二酚和邻苯二酚的测定,获得满意结果。
A silver doped poly（L-methionine） modified glassy carbon electrode was fabricated through cyclic voltammetric method.The electrochemical behaviors of hydroquinone and catechol on the silver doped poly（L-methionine） modified electrode were investigated.In a phosphate buffer solution with pH=5.0,the modified electrode gave a pair of redox peaks at Epa=0.228 V,Epc=0.162 V for hydroquinone and Epa=0.347 V,Epc=0.287 V for catechol at the scan rates of 100 mV/s.Two peak differences for oxidation or reduction were 119 mV or 125 mV,respectively.Under optimized conditions,the oxidation peak currents were proportional to the concentrations of hydroquinone and catechol,respectively.The linear ranges for the simultaneous determination of hydroquinone and catechol using differential pulse voltammetry were 3.00×10-6~1.00×10-4 mol/L.The detection limits were 8.0×10-7 mol/L for hydroquinone and 5.0×10-7 mol/L for catechol,respectively.The as-established protocol was successfully applied for the simultaneous determination of hydroquinone and catechol in waste water samples with satisfactory results.
出处
《应用化学》
CAS
CSCD
北大核心
2012年第5期576-584,共9页
Chinese Journal of Applied Chemistry
基金
安徽省高校省级自然科学研究重点项目基金资助项目(KJ2011A255)
关键词
银掺杂聚L-甲硫氨酸修饰电极
对苯二酚
邻苯二酚
同时测定
循环伏安法
差分脉冲伏安法
silver doped poly（L-methionine） modified electrode
hydroquinone
catechol
simultaneous determination
cyclic voltammetry
differential pulse voltammetry
