Cu2+-ion sensitive surface on graphite electrodes

PEDRE, IGNACIO; MENDEZ DE LEO, LUCILA PAULA; GRACIELA A. GONZALEZ

ANALYTICAL AND BIOANALYTICAL CHEMISTRY

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2019 vol. 411 p. 7761 - 7770

1618-2642

A new electrochemical interface based on polyacrylic acid (PAAcid) immobilized in a Nafion® polymeric matrix on graphite screen printed electrodes for detecting copper is presented. The copper is retained in the surface due to the capacity of the polyacid to chelate metals, and quantified using square wave voltammetry. The response was characterized by spectroscopic techniques (UV-vis-IR), which confirmed the chelation from the Cu2+ ions by the acid.A calibration curve is presented, showing good linearity and repeatability and its usefulness as a sensor. The range of operation goes from 15 to 50 M, with a detection limit of 12 M, making the sensor useful for measurements in environmental samples (after a preconcentration step) and in drinking water.