【摘要】 通过一步电沉积制备了石墨烯-金纳米复合膜修饰破碳电极,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5.0~30μg/L两个线性范围,Hg(Ⅱ)检测限(S/N=3)为0.030μg/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.更多还原

【Abstract】 The graphene-gold nanoparticles composite film modified glassy carbon electrode(EGAuNPs/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 ability 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.更多还原