Overview
Ogidi and colleagues analyzed eight brands of canned sardines from Yenagoa, Nigeria, by flame AAS for eight metals and estimated daily intake and hazard quotients. Only zinc and iron were detected; lead, cadmium, copper, nickel, manganese and chromium were below the stated detection limit of 0.001 in every brand. Arsenic and mercury were not measured.
Key numbers
- Lead and cadmium: below detection (<0.001 mg/kg) in all eight brands (Table 1, p. 40).
- Iron: 1.34 ± 0.001 to 2.67 ± 0.001 mg/kg (Table 1, p. 40).
- Zinc: 0.03 ± 0.001 to 0.14 ± 0.001 mg/kg (Table 1, p. 40).
Methods (brief)
A “5 ml” portion of each sample was wet-digested with a nitric, sulfuric, hydrochloric and perchloric acid mix and read by flame AAS in triplicate. Spike recovery was mentioned but no recoveries are reported, and no reference material was used.
Evidence Fitness
One can per brand and weak QA. The zinc and iron values are far below normal levels for sardines, which suggests a dilution or basis problem, so the non-detects for lead and cadmium should be read with caution. The comparison limits printed in the table look like drinking-water values. Direct but low-quality evidence for tinned-fish.
Related evidence
Update history
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