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Determination of copper and nickel in vegetable oils by direct sampling graphite furnace atomic absorption spectrometry
Abstract
The quality of food products has been receiving great attention due to its influence on human nutrition and health. In this sense, the determination of trace metals in foods has turned an important field on food analysis. Concerning vegetable oils, its metal trace composition is an important criterion for the assessment of their quality once it is known that trace metals affect their rate of oxidation, influencing freshness, keeping properties as well as storage. In the present work an analytical method which enables the direct determination of Cu and Ni in vegetable oils by graphite furnace atomic absorption spectrometry (GFAAS), using a "solid" sample strategy is presented: in nature, samples are directly weighed on the graphite platform boat and inserted in the graphite tube. An adequate temperature program permitted the calibration by external aqueous analytical curves. Good concordance between the proposed procedure and EPA procedures was found in the analysis of real samples. Limits of detection of 0.001 and 0.002mugg(-1) were found for Cu and Ni, respectively, in the original samples, and they were comfortably below the concentrations found.
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Direct determination of trace metals in oils by atomic spectroscopic techniques is difficult due to high viscosity and high organic contents of oils.
“However, direct determination of trace metals in oils by AS is dif fi cult due to high viscosity and high organic contents of oils [13,14].”
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Cites
Ashing techniques in the determination of iron and copper in palm oil
Saleh, M. I., Murray, R. S., & Chin, C. N. (1988) · Journal of the American Oil Chemists' Society · doi:10.1007/bf02542378 · Cited by 20
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Karimi, M., Dadfarnia, S., Shabani, A. M. H., Tamaddon, F., & Azadi, D. (2015) · Talanta · doi:10.1016/j.talanta.2015.07.021 · Cited by 182
López-García, I., Vicente-Martínez, Y., & Hernández-Córdoba, M. (2014) · Talanta · doi:10.1016/j.talanta.2014.02.011 · Cited by 87
Metadata
- Authors
- Matos Reyes, M. N., & Campos, R. C.
- Venue
- Talanta
- Publisher
- Elsevier BV
- Published
- 2006-12-15
- Volume
- 70
- Issue
- 5
- Pages
- 929-932
- ISSN
- 0039-9140 (ISSN-L)
- OpenAlex
- W2037703160
- Cited by
- 79
- References
- 1
- Citations by year
- 2023: 3 · 2022: 5 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 3 · 2017: 4 · 2016: 3 · 2015: 11 · 2014: 6 · 2013: 1 · 2012: 11
- FWCI
- 5.40
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Talanta (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Analytical Chemistry › Analytical chemistry methods development
- Physical Sciences › Chemistry › Organic Chemistry › Edible Oils Quality and Analysis
- Physical Sciences › Chemistry › Spectroscopy › Laser-induced spectroscopy and plasma
- Keywords
- copper determination, nickel determination, vegetable oils, direct sampling, trace metals in food, food quality, oil oxidation, detection limit
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