Differential pulse voltammetric analysis of lead in vegetables using a surface amino-functionalized exfoliated graphite nanoplatelet chemically modified electrode

En este artículo un tipo de voltamperometría de pulso diferencial fue utilizada para determinar plomo(II) en vegetales como el repollo. Para este análisis se usa un electrodo modificado químicamente con una superficie amino funcional exfoliada de grafito nanoplatelet.

A surface amino-functionalized (CONH2) exfoliated graphite nanoplatelet (xGnP) bismuth-modified electrode (CONH2xGnP/glassy carbon electrode GCE) for the detn. of lead was developed and characterized.  The hybrid material was characterized by Fourier transform IR spectroscopy (FTIR) and SEM (SEM).  The electrochem. properties of the CONH2xGnP bismuth-modified electrode were characterized by a phys. deposition method, depositing the film on a graphite electrode.  The differential pulse response was linear over the Pb(II) concn. range of 0.005-0.045 μg L-1, with a limit of detection of 0.001 μg L-1, and the linear regression equation was y = 3.75x + 0.73.  In vegetable juice (cabbage), the current increased linearly relative to the Pb(II) concns. over the concn. range 0.005-0.035 μg L-1 with the corresponding linear regression equations: y = 13.06x + 0.46, R2 = 0.9970.

 Ion, Ion; Ion, Alina Catrinel                                                      

 Sensors and Actuators, B: Chemical (2012), 166-167, 842-847.