Overview
Shahriar and colleagues measured copper and lead by AAS in raw milk from farms near industrial and waste disposal areas of Chittagong, Bangladesh, and in market yoghurt and ghee. Lead stayed at or below 0.020 mg/kg in every sample, and four samples read 0.000. Copper was higher in the milk products, especially ghee.
Key numbers
- Raw milk, 25 farms: lead 0.000 to “0.020 ± 0.0008” mg/kg (M-7), copper up to “0.480 ± 0.0020” mg/kg (Table 1).
- Yoghurt, 8 samples: lead up to “0.016 ± 0.0054” mg/kg (Table 2).
- Ghee, 7 samples: lead up to “0.015 ± 0.0036” mg/kg; copper up to “0.835 ± 0.0648” mg/kg (Table 2).
Methods (brief)
Liquids were acid-digested and solids dry-ashed, then analysed by AAS (Analytik Jena ZEEnit 700P) against 0.40 to 1.20 ppm standards. The ± values are SEMs of replicate readings. No detection limit, reference material or recovery is reported.
Evidence Fitness
The tables give per-sample values, but sample counts disagree across the abstract (30), methods (25 farms) and results (40), and the text maxima (copper 0.198 and 0.244 mg/kg) do not match the tables. The calibration range is far above the lead levels reported. The printed DOI (10.56431/p-25obfk) differs from the manifest DOI (10.18052/www.scipress.com/ilcpa.27.56), and the printed first-author spelling is Shahriar. No cheese was measured, so these milk products are only a loose proxy for the macaroni and cheese page.