Overview
Nangbes and colleagues collected potato and carrot composites with their soils from five farms in Bokkos, Plateau State, and measured cadmium, chromium, copper, nickel and lead by atomic absorption, then calculated transfer factors and hazard indices. All food results are reported in mg/L of the sample digest, not per kilogram of food.
Key numbers
- Irish potato, five-farm mean: lead 0.019 ± 0.002 mg/L, cadmium 0.006 ± 0.0042 mg/L of digest (Table 1, p. 51).
- Carrot, five-farm mean: lead 0.033 mg/L, cadmium 0.007 ± 0.000 mg/L of digest (Table 2, p. 51).
Methods (brief)
Samples were washed, rinsed in 1% nitric acid, oven-dried at 80 °C and powdered; 1 g was digested with nitric, sulfuric and perchloric acids and made up to 50 mL for AAS. No detection limits, blanks, recoveries or reference materials are reported.
Evidence Fitness
Weak evidence: one composite per farm, no QA, and results only in mg/L of digest, which the authors compare directly with mg/kg limits. The PDF does not print the DOI. Values must not be compared with mg/kg data. Raw potato and carrot are proxies for cream-of-potato-soup and root-vegetable-purees, so those pages are not linked.