Overview
Nkwocha and coauthors measured heavy metals, antinutrients, physicochemical properties, and PAHs in raw cashew nuts from Enugu State, Nigeria. The source is routeable to cashews because it reports numeric Cd, Pb, and Hg concentrations in the edible nut matrix. Values are summary-level, not sample-level distributions.
Key numbers
- Raw cashew nuts contained Cd 0.0703 +/- 0.0096 ppm, Pb 0.0773 +/- 0.0047 ppm, and Hg 0.8013 +/- 0.0785 ppm. Values are mean +/- standard deviation of triplicate analytical determinations of a single composite sample (Table 1, p. 68).
- The same summary reports PAHs and antinutrients, but those are context only for Heavy Metal Index routing.
- The PDF describes frying in vegetable oil for 10 minutes to remove seeds from pods, then oven-drying at 40-60 C, dehulling, and grinding before analysis.
Methods (brief)
Heavy metals (Hg, Pb, Cd) were analyzed using an AA240 atomic absorption spectrophotometer (Agilent Technologies, USA per equipment list on p. 67; heavy-metal section text reads “variant AA240” - likely a typo for “Varian”, whose AAS line Agilent acquired in 2010) following APHA (1995). The paper does not describe a cold-vapor accessory or DMA for Hg, which is unusual for low-level mercury quantification. Reporting basis is ppm for the dehulled, ground nut matrix.
Implications
Certification: summary-level cashew occurrence evidence for Cd, Pb, and tHg from one Nigerian source. Not distribution-ready - it contributes one composite-sample data point per analyte. Courses: example of processed sample preparation needing basis notes (frying in oil before analysis). App: supports a Nigeria/Enugu context flag for cashew nuts.
Related evidence
Update history
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