Abstract
A standard digestion method coupled to electrochemical detection for the monitoring of heavy metals in biological samples has been used for the simultaneous analysis of the target analytes. Square wave anodic stripping voltammetry (SWASV) coupled to disposable screen-printed electrodes (SPEs) was employed as a fast and sensitive electroanalytical method for the detection of heavy metals. The aim of our study was to determine Cd, Pb and Cu by SWASV in brown algae (Sargasum natan) and green turtle eggs (Chelonia mydas) using screen-printed electrodes. The method proved useful for the simultaneous analysis of these metals by comparison between two different procedures for preparing the samples. Two different approaches in digestion protocols were assessed. The study was focused on Guanahacabibes brown algae and green turtle eggs because the metal concentrations recorded in this area may be used for intraspecific comparison within the Guanahacabibes Protected Sea Park area, a body of water for which information is still very scarce. The best results were obtained by digesting biological samples with the EPA 3050B method. This treatment allowed the fast and quantitative extraction from brown algae and green turtle eggs of the target analytes, with high sensitivity and avoiding organic residues, eventually affecting electrochemical measurements.
Highlights
ObjectivesThe aim of our study was to determine Cd, Pb and Cu by Square wave anodic stripping voltammetry (SWASV) in brown algae (Sargasum natan) and green turtle eggs (Chelonia mydas) using screen-printed electrodes
Marine contaminations by anthropogenic chemicals pose one of the worst problems to coastal and estuarine ecosystems around the word
When measurements are made at low analyte levels, e.g. in trace analysis, it is important to determine the lowest concentration of the analyte or property value that can be confidently detected by the method, and the lowest concentration of analyte that can be determined with an acceptable level of repeatability, precision and trueness
Summary
The aim of our study was to determine Cd, Pb and Cu by SWASV in brown algae (Sargasum natan) and green turtle eggs (Chelonia mydas) using screen-printed electrodes. The aim of our study was to apply a digestion method (EPA 3050B) to determine Cd, Pb and Cu by square-wave anodic stripping voltammetry in brown algae (Sargasum natan) and green turtle (Chelonia mydas) eggs, using a screen-printed electrode, and it demonstrated the usefulness of this method for the simultaneous analysis of Cd, Pb and Cu by comparison between two different procedures for preparing the samples
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