食品科学

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多重增敏环保型痕量铅电化学传感器研制

何卫东,窦文超,赵广英*   

  1. 浙江工商大学食品与生物工程学院,浙江省食品安全重点实验室,浙江 杭州 310000
  • 出版日期:2015-01-25 发布日期:2015-01-16
  • 通讯作者: 赵广英
  • 基金资助:

    国家自然科学基金面上项目(30571623)

Development of Environmental-Friendly and Multiple Sensitive Electrochemical Sensor for the Detection of Trace Lead

HE Weidong, DOU Wenchao, ZHAO Guangying*   

  1. Key Laboratory of Food Safety of Zhejiang Province, College of Food Science and Biotechnology Engineering,
    Zhejiang Gongshang University, Hangzhou 310000, China
  • Online:2015-01-25 Published:2015-01-16
  • Contact: ZHAO Guangying

摘要:

为改进铅电化学传感器的敏感性、稳定性、准确性和安全性,用碳酸羟基磷灰石高效富集Pb2+,用离子液体([BMIM]PF6)增加其导电性,加覆Nafion膜增加其敏感性与稳定性,共同修饰丝网印刷碳电极,构建一种多重增敏环保型快速检测痕量铅电化学传感器;优化检测条件后用方波溶出伏安法进行测定的结果为:
Pb2+质量浓度在3~600 μg/L范围内呈现良好的线性关系,检出限为0.37 μg/L(RSN=3),连续8 次测定的相对标准偏差为3.4%。茶叶样品检测结果与电感耦合等离子体质谱测定结果无显著性差异。本研究研制出一种环保、敏感、准确、经济、简便且可用于茶叶中痕量铅检测的新型电化学传感器。

关键词: 碳酸羟基磷灰石, 电化学传感器, 铅, 茶叶

Abstract:

This study aimed to improve the sensitivity, stability, accuracy and safety of the electrochemical sensor
for lead (Pb2+). The screen-printed carbon electrode (SPCE) was modified with carbonated hydroxyapatite to
accumulate Pb2+ efficiently, ionic liquid [BMIM]PF6 to improve electrical conductivity, and Nafion membrane
to increase the sensitivity and stability. Thus, we established an environmental-friendly and multiple sensitive
electrochemical sensor for rapid determination of trace lead. Under optimized experimental conditions, the signal
peaks of square-wave stripping voltammetry had a linear relationship with Pb2+ concentrations in the range from
3 to 600 μg/L, with a detection limit of 0.37 μg/L (RSN = 3). The relative standard deviation (RSD) of the sensor
was 3.4% (n = 8). The results determined by this method were similar to those determined by ICP-MS. The
electrochemical sensor developed in this study proved environmental-friendly, sensitive, accurate, economic and
convenient.

Key words: carbonated hydroxyapatite (CHA), elecrtrochemical sensor, lead, tea

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