Electroanalysis
Electroanalysis
5 years ago

Stripping Voltammetric Determination of Mercury in Fish Oil Capsules Using a Screen-Printed Gold Electrode

Stripping Voltammetric Determination of Mercury in Fish Oil Capsules Using a Screen-Printed Gold Electrode
Eduardo S. Almeida, Rodrigo A. A. Munoz, André L. Squissato, Eduardo M. Richter, Diego P. Rocha
This work presents a simple electrochemical method for Hg determination in fish oil capsules using anodic stripping voltammetry (ASV) on a screen-printed gold electrode (SPGE). Samples were treated in an ultrasonic bath for 15 min in the presence of a 1 : 1 (v/v) concentrated HCl/H2O2 mixture at room temperature. The limit of detection (LOD) was estimated as 0.25 μg L−1 (corresponding to 7.6 μg kg−1 of oil) with a linear range between 5 and 400 μg L−1 (90 s of deposition time). The analyzed fish oil samples presented Hg concentration below the LOD value. Recovery values for samples spiked with oil standard containing Hg ranged from 95 to 105 %. The method is precise (inter-day and intra-day RSD<4 % for n=3) as well as the SPGE sensors (RSD=4.3 %, n=3), which were used continuously (around 100 analyses without replacement) under such oxidation media. The proposed method is feasible to be applied for on-site determinations due to the portability of sensing and sample treatment approaches.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/elan.201700570

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