Enemuor et al. 2021 - Heavy metals in Kogi East palm oil

Enemuor, Adige, and Okechukwu measured microbial contamination, physicochemical quality, and heavy metals in locally produced crude palm oil sold in three markets in Kogi East, Nigeria. The source reports market-level mean concentrations for Cd, Cr, Pb, As, Cu, and Fe in ppm after acid digestion and flame AAS. It is routeable palm-oil occurrence evidence, with arsenic reported only as total arsenic because the paper does not provide speciation.

Key numbers

Table 3 reports mean detectable metal concentrations in ppm for palm-oil samples from each market. The paper uses the symbol Ar in the methods sentence but labels the table row as arsenic (As); this page records the analyte as total arsenic (tAs) because no inorganic-arsenic speciation is reported.

The authors state that arsenic and iron means were above their cited acceptable limits in all three markets, and that cadmium in Idah-market samples was also above their cited permissible limit. The study did not report individual sample values, standard deviations for the metal table, LOD/LOQ beyond the table’s <0.001 notation, or arsenic speciation.

Methods (brief)

The study bought ten palm-oil samples from ten sellers in each of three Kogi East markets, for 30 samples total. Samples were collected into sterile universal bottles and transported to the laboratory for microbiological and heavy-metal analyses. For metals, 5 g of each oil sample was digested with an acid mixture of concentrated nitric acid, perchloric acid, and concentrated sulfuric acid, then analyzed by flame atomic absorption spectrometry for Pb, Cd, Fe, arsenic, and Cu; Table 3 also reports Cr.

Implications

Certification: This source contributes summary-level palm-oil occurrence evidence for total arsenic, cadmium, chromium, lead non-detects, copper, and iron in the Nigeria market. It should not be pooled as inorganic arsenic, and it does not provide sample-level distributions.

Courses: Useful for teaching the difference between local-market edible-oil occurrence data and plantation-soil contamination studies that are not directly routeable to finished oil.

App: Adds palm-oil market-context values for Nigeria, with market names and non-detect notation preserved.

Microbiome: The paper includes microbial isolates from palm oil, but it does not study gut microbiome exposure or effects.

Wiki pages this source may touch

• palm-oil
• cooking-oils-other
• arsenic
• cadmium
• chromium
• lead
• copper
• iron

Verification notes

• The PDF title page identifies the article as African Journal of Microbiology Research, volume 15 issue 8, pages 454-460, DOI 10.5897/AJMR2021.9564.
• The article states that it is open access under the Creative Commons Attribution License 4.0 International License.
• sample_n: 30 counts the 30 purchased palm-oil samples; the metal table is reported as market-level means rather than sample-level data.
• Arsenic is treated as total arsenic because the methods and results do not report inorganic arsenic speciation.
• Lead is non-detect at <0.001 ppm in all three market summaries; those non-detects are documented here but not converted into a benchmark percentile.

Page history

The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.