Evaluation of two sample preparation methods for the determination of cadmium, nickel and lead in natural foods by Graphite Furnace Atomic Absorption Spectrophotometry
Environmental pollution allows heavy metals to interact with ecosystems, bioaccumulating and passing through the food chain. Animals and humans can consume contaminated species and reach toxic and harmful concentrations in their organisms. While there are international regulatory frameworks for h...
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| Formato: | article |
| Lenguaje: | EN ES |
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Pontificia Universidad Javeriana
2019
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| Acceso en línea: | https://doaj.org/article/57674320845b43de8e480d73f9081f64 |
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| Sumario: | Environmental pollution allows heavy metals to interact with ecosystems, bioaccumulating
and passing through the food chain. Animals and humans can consume contaminated species
and reach toxic and harmful concentrations in their organisms. While there are international
regulatory frameworks for heavy metal contents, these are not always known or suitable
for local conditions. This situation calls for the development of locally-applicable analytical
methods for the determination of heavy metal concentrations in common vegetal and
animal food products. Two established methods (AOAC 999.11, based on sample drying and
calcination, and IPN AC-06-00, based on microwave-assisted acid digestion) were comparatively
tested at the CESAQ-PUCE laboratory in Quito, Ecuador, to determine their suitability.
Sample matrices used were non-industrial, non-organic tomato, lettuce, and beef commonly
found in local markets. Heavy metals tested were cadmium, nickel, and lead. Test guidelines
and comparative parameters were based on AOAC (2002) and included quantification limits,
repeatability variation coefficients, intermediate precision percentages, accuracy and calculated
expanded uncertainties. Unlike method AOAC 999.11, method IPN AC-06-00 performance
for all parameters was within the range of recommended expected values as per AOAC, and
was therefore deemed more suitable to be applied under the local CESAQ-PUCE laboratory
conditions. The validation of method IPN AC-06-00 demonstrated its local applicability.
In addition, IPN AC-06-00 can be used by similar laboratories to assess contaminants
concentrations and improve the baseline information concerning human exposure to toxic
metals.
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