Rod-like hydroxyapatite and Nafion nanocomposite as an electrochemical matrix for simultaneous and sensitive detection of Hg^{2 +}, Cu^{2 +}, Pb^{2 +} and Cd^{2 +}

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• 作者：Feng Gao^a ; ^b ; ^{Fgao1981@mnnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ningning Gao^a ; Ayaka Nishitani^b ; Hidekazu Tanaka^b ; ^{hidekazu@riko.shimane-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hydroxyapatite ; Nafion ; Heavy metal ion ; Differential pulse anodic stripping voltammetry
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：775
• 期：Complete
• 页码：212-218
• 全文大小：1152 K

文摘

The uniform rod-like hydroxyapatite (HAP) particles were synthesized through a simple wet method, which was characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and transmission electron microscopy (TEM). The composite of HAP-Nafion was then prepared and used as a matrix for simultaneous determination of Hg^2 +, Cu^2 +, Pb^2 + and Cd^2 + by differential pulse anodic stripping voltammetry (DPASV). The good dispersibility, large specific surface area, rich active sites, and strong adsorption property of the composite contributed to the enhanced stripping signals of the four heavy metal ions. Under the optimized experimental conditions, the calibration curves for Hg^2 + covered two linear ranges from 0.1 to 1.0 μM and from 3.0 to 10.0 μM. For Cu^2 +, Pb^2 + and Cd^2 +, the linear calibration curves ranged from 0.1 μM to 10.0 μM. Based on a signal-to-noise ratio characteristic of 3, the detection limits of Hg^2 +, Cu^2 +, Pb^2 + and Cd^2 + were estimated to be 0.030 μM, 0.021 μM, 0.049 μM and 0.035 μM, respectively. The developed method was also utilized for the detection of Hg^2 +, Cu^2 +, Pb^2 + and Cd^2 + in real water samples, and satisfactory results were obtained.