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Graphene-gold Nanoparticle Composite Film Modified Electrode for Determination of Trace Mercury in Environmental Water
Xue-mei Wang,Shou-guo Wu*,Hao Liu,Lei Zhou,Qi-ping Zhao
Author NameAffiliationE-mail
Xue-mei Wang Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Shou-guo Wu* Department of Chemistry, University of Science and Technology of China, Hefei 230026, China sgwu@ustc.edu.cn 
Hao Liu Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Lei Zhou Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Qi-ping Zhao Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Abstract:
The graphene-gold nanoparticles composite film modified glassy carbon electrode (EG-AuNPs/GCE) was prepared by one-step coelectrodeposition and employed for determination of trace mercury in environmental water with differential pulse stripping voltammetry. Such a nanostructured composite film combined with the advantages of gold nanoparticles and graphene, can greatly promote the electron-transfer process and increase accumulation abil-ity for Hg(II), leading to a remarkably improved sensitivity. The linear calibration curve ranged from 0.2 μg/L to 30 μg/L for Hg(II) and the detection limit (S/N=3) was found to be 0.03 μg/L at a deposition time of 300 s. Moreover, the stablity of the as-prepared electrode and interferences from other substances were evaluated. The modified electrode was successfully applied to the direct detection of Hg(II) in real water samples.
Key words:  Graphene-gold nanoparticle composite membrane, Chemically modified elec-trode, Mercury, Stripping voltammetry
FundProject:
石墨烯-金纳米复合膜修饰电极溶出伏安法测定水中痕量汞
王雪梅,吴守国*,刘皓,周磊,赵祺平
摘要:
通过一步电沉积制备了石墨烯-金纳米复合膜修饰玻碳电极,并以此修饰电极为工作电极,采用差分脉冲阳极溶出伏安法测定环境水中痕量汞. 这种纳米复合膜结合了金纳米粒子和石墨烯两者的优势,能够增加异相电子转移速度和修饰电极对汞的富集能力,从而显著提高了电极的灵敏度和选择性. 这种修饰电极具有良好的分析性能:Hg(II)的分析曲线覆盖了0.2~5.0和5.0~30 μg/L两个线性范围,Hg(II)检测限(S/N=3)为0.030 μg/L. 此外,该修饰电极还表现出良好的稳定性和抗干扰性能,还被成功地应用于实际水样中Hg(II)的测定.
关键词:  石墨烯-金纳米复合膜,化学修饰电极,汞,溶出伏安法
DOI:10.1063/1674-0068/26/05/590-596
分类号: