Highly sensitive and selective voltammetric detection of mercury(II) using an ITO electrode modified with 5-methyl-2-thiouracil, graphene oxide and gold nanoparticles
作者： Na Zhou , Hao Chen , Jinhua Li , Lingxin Chen
DOI: 10.1007/S00604-013-0956-0
关键词: Oxide 、 Detection limit 、 Metal ions in aqueous solution 、 Chemistry 、 Colloidal gold 、 Graphene 、 Electrochemical gas sensor 、 Indium tin oxide 、 Tap water 、 Inorganic chemistry
摘要: We have developed an electrochemical sensor for highly selective and sensitive determination of Hg(II). It is based on the specific binding 5-methyl-2-thiouracil (MTU) Hg(II) to surface indium tin oxide (ITO) electrode modified with a composite made from graphene (GO) gold nanoparticles (AuNPs). This leads largely enhanced differential pulse voltammetric response Following optimization method, good linear relationship (R = 0.9920) found between peak current concentration in 5.0-110.0 nM range. The limit detection (LOD) 0.78 at signal-to-noise ratio 3. A study interference by several metal ions revealed no interferences. feasibility this method was demonstrated analyses real water samples. LODs are 6.9, 1.0 1.9 tap water, bottled lake samples, respectively, recoveries samples spiked 8.0, 50.0 100.0 were 83.9-96.8 %, relative standard deviations ranging 3.3 % 5.2 %.
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