Overview
Konuspayeva and colleagues sampled raw herd mixed camel milk and on-farm fermented camel milk (shubat) from 24 farms in five Kazakh oblasts chosen for nearby pollution sources (traffic, oil drilling, a spaceport, polymetal and phosphate industry, cotton fields). Lead, cadmium, copper and zinc were measured by ICP-AES and reported as regional means in ppm. The paper also screened organic pollutants and caesium-137, which are not extracted here.
Key numbers
- Raw camel milk lead, regional means: Almaty 0.06 ppm, South-Kazakhstan 0.04 ppm, Kyzylorda 0.02 ppm, Zhambyl 0.01 ppm, Atyrau < 0.01 ppm; total mean 0.03 ± 0.02 ppm (Table 1).
- Raw camel milk cadmium: Almaty 0.003 ppm, South-Kazakhstan 0.002 ppm, other oblasts < 0.001 ppm; total mean 0.002 ± 0.001 ppm (Table 1).
- Shubat lead and cadmium are printed identical to raw milk in every oblast (Table 1).
- Zinc total mean 4.70 ± 1.16 ppm in milk and 5.06 ± 1.59 ppm in shubat (Table 1).
Methods (brief)
Ten mL of milk was ashed at 500 °C with nitric acid, redissolved and analyzed by ICP-AES (Varian Vista MPX) using standard addition with an 11-point curve and commercial quality-control standard solutions. No detection limits, milk reference material or recoveries are reported. The number of samples per oblast is not printed.
Evidence Fitness
Direct evidence for raw camel milk, but at farms deliberately chosen near pollution sources, so it is a monitoring sample rather than a representative market survey. Regional sample sizes, collection dates and detection limits are missing, and the abstract’s claim that some samples exceeded 500 ppb lead is not supported by any printed individual value. The authors quote milk lead limits of 0.02 ppm (Turkey), 0.05 ppm (Germany and Holland) and 0.1 ppm (Kazakhstan).