Systematic evaluation of sample preparation method for simultaneous voltammetric determination of Zn, Cd, Pb, and Cu in macroalgae

In this paper, four mineralization procedures of macroalgae were evaluated. Two methods used a closed system microwave) and two an open system (strong acid and ultraviolet radiation). Zn, Cd, Pb, and Cu were determined by square-wave anodic stripping voltammetry (SWASV) and graphite furnace atomic a...

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Bibliographic Details
Published in:Journal of applied phycology 2017-02, Vol.29 (1), p.595-605
Main Authors: Almeida, Leandro S., Streit, Nivia, Costa, Daniel, Seus, Elisa R., Andrade, Carlos F. F., Pereira, Claudio M. P., Colepicolo, Pio, Dias, Daiane
Format: Article
Language:English
Subjects:
Algae
Atomic absorption spectroscopy
Biomedical and Life Sciences
Ecology
Freshwater & Marine Ecology
Life Sciences
Mineralization
Organic carbon
Plant Physiology
Plant Sciences
Sample preparation
Spectral analysis
Spectrometry
Statistical analysis
Ultraviolet radiation
Voltammetry
Zinc
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Summary:In this paper, four mineralization procedures of macroalgae were evaluated. Two methods used a closed system microwave) and two an open system (strong acid and ultraviolet radiation). Zn, Cd, Pb, and Cu were determined by square-wave anodic stripping voltammetry (SWASV) and graphite furnace atomic absorption spectrometry (GF AAS) was used as comparative method. Determinations of total, inorganic, and organic carbon, as well as the study of matrix effect, were performed. It could be observed that, although mineralizations accomplished with open systems presented lower levels of total carbon and lower matrix effect, the determinations of compounds from standard reference material (SRM) did not show acceptable recoveries. However, the mineralization using microwave (closed system—methods A and B) showed recovery within the acceptable range to all compounds (78 to 115 %), and after statistical analysis, it can be concluded that the method A is more accurate than the method B; therefore, most suitable for macroalgae mineralization and simultaneous determination of Zn, Cd, Pb, and Cu by voltammetry.
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-016-0935-z