Determination of Heavy Metals in Dried Seafood Products by Inductively Coupled Plasma - Optical Emission Spectrometry

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Phutthathida Duangklat
Marisa Intawongse

Abstract

This research aimed to compare the sample digestion methods i.e., wet digestion and microwave digestion for the determination of manganese (Mn), copper (Cu), zinc (Zn), iron (Fe) and lead (Pb) in dried seafood products by Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES). The samples were collected randomly from five local markets in Surat Thani Province i.e., Muang District (A1), Kanchanadit District (A2), Don Sak District (A3), Chaiya District (A4) and Tha Chang District (A5) in May 2022. The results showed that microwave digestion was the suitable method for this study. The parameters for method validation obtained correlation coefficient of the standard curve (0.9990 - 0.9998), accuracy (84.9 - 111.8%), precision (1.8 - 7.5% RSD), limits of detection (5.1, 11.1, 17.3, 13.5, and 14.5 nanogram per gram (ng/g) for Mn, Cu, Zn, Fe, and Pb, respectively), and limits of quantification (5.6, 12.9, 26.2, 14.5, and 15.0 ng/g for Mn, Cu, Zn, Fe, and Pb, respectively). The heavy metal amounts found in all dried seafood samples, in descending order were Fe > Zn > Cu > Mn with the mean concentrations of 49.53±33.31, 15.33±11.86, 4.15±5.90 and 2.88±1.92 milligram per kilogram (mg/kg) fresh weight, respectively. The amounts of lead were not detectable in all samples. In addition, it was found that dried shrimp and dried squid were classified as excellent sources of iron and copper (27.6 - 93.1 of daily value percentage).

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บทความวิจัย (Research Articles)

References

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