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利用十二烷基苯磺酸钠溶液分散羟磷灰石和离子液体,替代惯用的有毒汞修饰丝网印刷碳电极,构建新型快速测定痕量铅电化学传感器。选用0.1 mol/L HAc-NaAc为支持电解质,用方波溶出伏安法,优化羟磷灰石与离子液体比例和修饰方法等检测条件。采用常规电感耦合等离子体质谱法验证本方法对实际样本中铅的检测结果。在优化的工作条件下,铅电化学传感器在4~250μg/L质量浓度范围内得到标准曲线,检测限为0.386μg/L(RSN=3);连续5次测定后的相对标准偏差为3.87%。新型快速铅检测电化学传感器与普通的传感器相比,稳定性、灵敏度和安全性都得到有效改善,且准确、经济、易规范,其创新性显著,具广泛的应用潜力。
The use of sodium dodecyl benzene sulfonate solution dispersed hydroxyapatite and ionic liquid, instead of the usual toxic mercury modified screen printed carbon electrodes, to build a new rapid determination of trace lead electrochemical sensors. 0.1 mol / L HAc-NaAc was used as the supporting electrolyte. The square wave stripping voltammetry was used to optimize the ratio of hydroxyapatite to ionic liquid and the modification method. Conventional inductively coupled plasma mass spectrometry was used to verify the results of this method for the detection of lead in real samples. Under the optimum operating conditions, the lead electrochemical sensor obtained a standard curve with a mass concentration range of 4 ~ 250μg / L with a detection limit of 0.386μg / L (RSN = 3). The relative standard deviation after 5 consecutive determinations was 3.87% . Compared with ordinary sensors, the new rapid lead detection electrochemical sensor can effectively improve the stability, sensitivity and safety, and is accurate, economical and easy to be regulated. Its innovativeness is remarkable and has a wide range of potential applications.