Cost-Effective Voltammetric Determination of Salicylic Acid in Milk Using Copper Wire Electrodes
Giulia C. P. Freitas, Vitoria B. Messias, Regina M. Takeuchi, André L. Santos
TL;DR
This paper introduces a low-cost, eco-friendly method to detect salicylic acid in milk using copper wire electrodes and simple chemical treatments.
Contribution
A novel, sustainable voltammetric method using Cu/CuO electrodes and a solvent-free sample pretreatment for salicylic acid detection in milk.
Findings
The Cu/CuO electrode enhanced the voltammetric response and provided antifouling properties.
The method achieved a linear range of 10–500 μmol L–1 and a detection limit of 3.0 μmol L–1.
Recovery percentages in spiked milk samples ranged from 91% to 107%, showing high accuracy.
Abstract
The illegal use of salicylic acid (SA) as a milk preservative raises significant health concerns, highlighting the need for accurate analytical methods capable of detecting this adulteration. This study presents an innovative, ecofriendly voltammetric method for SA determination in milk. The proposed method employs a working electrode fabricated from inexpensive, commercially available Cu wires, which were chemically modified with a CuO-rich layer grown electrochemically via cyclic voltammetry in alkaline medium (0.1 mol L–1 NaOH). This modifying layer not only enhanced the voltammetric response of SA but also conferred antifouling properties to the working electrode. Differential pulse voltammetry, under optimized conditions, yielded a linear range of 10–500 μmol L–1 with a limit of detection of 3.0 μmol L–1. A key innovation is a simple and rapid sample pretreatment using aqueous…
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Taxonomy
TopicsAdvanced Chemical Sensor Technologies · Electrochemical sensors and biosensors · Electrochemical Analysis and Applications