title: Simultaneously determination of trace Cd(2+) and Pb(2+) based on L-cysteine/graphene modified glassy carbon electrode.
abstract: In this paper, L-cysteine/graphene-CS/GCE (L-cys/GR-CS/GCE) was prepared successfully, and its electrochemical properties were characterized by cyclic voltammetry (CV) and electrochemical AC impedance. Moreover, the electrochemical behaviors of Cd(2+) and Pb(2+) on the proposed electrode were studied by differential pulse anodic stripping voltammetry (DPASV). Experimental parameters, such as the deposition potential and time, the pH value of buffer solution, were optimized. Under the optimized conditions, the linear equations of the DPASV response current with Cd(2+) and Pb(2+) concentration were I (μA) = 0.745 C (μg/L)+4.539 (R = 0.9986), I (μA) = 0.437 C (μg/L)+2.842 (R = 0.9983), respectively, and the detection limit was 0.45 and 0.12 μg/L, respectively. Finally, L-cys/GR-CS/GCE was used to detect Cd(2+) and Pb(2+) in practical samples, and the results were compared with ICP-AES. This idea and method will provide a new approach for food security evaluation.
authors: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jingjiang College of Jiangsu University Environmental, Zhenjiang 212000, China.
authors: Wenshu
authors: W
authors: Zhou
authors: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
authors: Caihong
authors: C
authors: Li
authors: Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. Electronic address: sunchong0106@163.com.
authors: Chong
authors: C
authors: Sun
authors: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China. Electronic address: yangxiaodi@njnu.edu.cn.
authors: Xiaodi
authors: X
authors: Yang
mesh_terms: D002104:Cadmium / Q000032:analysis*; D003545:Cysteine / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D013499:Surface Properties
chemical_list: D002104:Cadmium; D007854:Lead; D006108:Graphite; D003545:Cysteine
keywords: Cadmium; Electrochemical determination; Lead; Modified electrode