Abstract
AbstractA simple, effective, and low‐cost protocol for copper determination in biodiesel, with no sample decomposition, is reported. Samples were diluted in an ethanol‐water solution (with HCl as supporting electrolyte) generating a homogeneous mixture at which copper was directly detected using stripping chronopotentiometry using a gold working‐electrode. The optimized mixture was 100 µL (0.088 g) of biodiesel, 15 mL of ethanol, and 5 mL of 0.1 mol L−1 HCl aqueous solution. The estimated detection limit was 200 ng g−1 (300‐s deposition time). The elimination of the sample treatment step offers the possibility of on‐site measurements in association with commercially‐available portable potentiostats.
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