多重增敏环保型痕量铅电化学传感器研制

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

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3~600μg/L范围内呈现良好的线性关系,检出限为0.37μg/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。

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.