摘要
在玻碳电极表面,采用电聚合方法一步制备聚吡咯纳米线。由于聚吡咯的电化学氧化还原过程伴随有硝酸根的掺杂/脱掺杂,基于此构建了硝酸根电流型传感器。详细探讨了电聚合溶液的pH值、电聚合电位、电聚合时间、富集电位和富集时间对聚吡咯纳米线形貌,以及对硝酸根在修饰电极表面电化学响应的影响。在最佳条件下,构建的硝酸根传感器的线性范围为1.0×10-3～4.0×10-3 mol/L,检出限(S/N=3)达到2.2×10-4 mol/L,且具有良好的稳定性、重现性以及抗干扰能力。
An amperometric nitrate sensor is developed based on the polypyrrole（PPy）-nanowire modified glassy carbon（GC） electrode,in which the three-dimensional interconnected porous PPy-nanowire matrix is electrochemically polymerized onto the GC electrode substrate. The electrochemical reduction peak of PPy is used to quantify the nitrate since the electrochemical redox process of PPy is accompanied with the doping/de-doping of nitrate. The influences of several experimental parameters including the pH value of the electropolymerization electrolyte,the potential and time of polymerization, the accumulation potential and duration on the electrochemical response of nitrate detection are thoroughly investigated. Under the optimized conditions,the linear range from 1.0× 10^-3 to 4.0 × 10^-3 mol/L and the detection limit of 2.2× 10^-4 mol/L（S/N=3） are obtained. The developed nitrate sensor showed good stability and satisfactory resistance of the interference of chlorine ion and phosphate ion.
出处
《分析科学学报》
CAS
CSCD
北大核心
2012年第5期593-597,共5页
Journal of Analytical Science
基金
国家“973”计划(No.2009CB320301)
国家水体污染控制与治理科技重大专项(No.2009ZX07527-007)
