Palomo-Marín M R, Rueda-Holgado F, Marín-Expósito J, Pinilla-Gil E
Department of Analytical Chemistry and IACYS, University of Extremadura, Av. de Elvas, s/n, E-06006 Badajoz, Spain.
Department of Analytical Chemistry and IACYS, University of Extremadura, Av. de Elvas, s/n, E-06006 Badajoz, Spain.
Talanta. 2017 Dec 1;175:313-317. doi: 10.1016/j.talanta.2017.07.060. Epub 2017 Jul 21.
We report here the use of commercial screen-printed disposable sensors comprising a sputtered bismuth working electrode, a silver pseudo reference electrode and a carbon auxiliary electrode (whole set referred as BiSPE), as a new and advantageous alternative for reliable and convenient monitoring of Cd and Pb in atmospheric particulate matter (PM10 fraction) by anodic stripping voltammetry after acid digestion. After a detailed exploration of surface composition and depth profiles of the BiSPE by SEM, EDX, XPS and EIS, chemical and instrumental variables have been optimized to develop a reliable method capable of measuring Cd and Pb with detection limits of 11.8ngmL and 6.1ngmL respectively. These detection limits are useful for pollution monitoring of these elements in ambient air under the requirements of international health and environmental protection standards. The accuracy of the method was assessed by voltammetric measurements of Cd and Pb in ERM®-CZ120 Fine dust (PM10-like) and ERM® 1648a Urban Particulate Matter certified reference materials. The applicability of the method to Cd and Pb determination in real samples was demonstrated by analysis of PM10 samples from the air quality network in Extremadura, with a good correlation respect to the standard ICP-MS methodology. Our work constitutes the first reference about the use of disposable sensors based on BiSPE for the determination of heavy metals in atmospheric particulate matter samples.
我们在此报告使用一种商用丝网印刷一次性传感器，其包括溅射铋工作电极、银伪参比电极和碳辅助电极（整套称为铋基丝网印刷电极，BiSPE），作为一种新的且具有优势的替代方案，用于在酸消解后通过阳极溶出伏安法可靠且方便地监测大气颗粒物（PM10部分）中的镉和铅。通过扫描电子显微镜（SEM）、能量散射X射线光谱（EDX）、X射线光电子能谱（XPS）和电化学阻抗谱（EIS）对BiSPE的表面成分和深度分布进行详细探索后，对化学和仪器变量进行了优化，以开发一种可靠的方法，该方法能够分别以11.8 ng/mL和6.1 ng/mL的检测限测量镉和铅。在国际健康和环境保护标准要求下，这些检测限对于环境空气中这些元素的污染监测很有用。通过对ERM®-CZ120细粉尘（类PM10）和ERM® 1648a城市颗粒物有证标准物质中的镉和铅进行伏安测量，评估了该方法的准确性。通过分析埃斯特雷马杜拉空气质量监测网络的PM10样品，证明了该方法在实际样品中测定镉和铅的适用性，与标准电感耦合等离子体质谱（ICP-MS）方法具有良好的相关性。我们的工作构成了关于使用基于BiSPE的一次性传感器测定大气颗粒物样品中重金属的首个参考文献。
