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Journal of Tea Science ›› 2012, Vol. 32 ›› Issue (6): 485-493.doi: 10.13305/j.cnki.jts.2012.06.002

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Hydroxyapatite/SDBS Modified Screen-printed Carbon Electrodes for the Rapid Determination of Trace Lead in Tea

YANG Fang, ZHAO Guang-ying*, DOU Wen-chao   

  1. Food safety lab of Zhejiang Province, College of Food Science and Biotechnology Engineering, Zhejiang Gongshang University, Hangzhou 310035, China
  • Received:2012-05-30 Revised:2012-07-04 Online:2012-12-15 Published:2019-09-05

Abstract: In order to improve the stability, sensitivity and safety of the electrochemical sensor for rapid determination of lead, the usual toxic mercury with screen-printed carbon electrode was replaced by the hydroxyapatite dispersed by SDBS, with added Nafion membrane to increase stability, so to establish a new electrochemical sensor for rapid determination of trace lead. The analysis was performed by square-wave stripping voltammetry, Sodium acetate buffer (0.1mol/L) was employed as the supporting electrolyte. Under the optimized working conditions, including amount of hydroxyapatite, pH of solution, accumulation time, a linear response range from 2μg/L to 300μg/L was obtained, the detection limit for lead determination was 0.460µg/L(S/N) =3. The sensor presented good repeatability, evaluated in terms of relative standard deviation (R.S.D.=4.59%). The result determined by this method was similar to ICP-MS method. The novel electrochemical sensor for rapid detection of lead effectively improved the sensitivity, stability and security. In addition, it had accurate results and possessed a certain application potential.

Key words: hydroxyapatite, electrochemical sensor, rapid determination of trace lead, tea

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