This is a national monitoring study of Pb, Cd, tHg, and As in 483 milk and dairy products collected from all 16 Polish voivodships in 2006–2007, coordinated by the National Institute of Public Health — National Institute of Hygiene (NIH) with sanitary-epidemiological station laboratories. All samples were analyzed using accredited validated methods meeting EU Commission Regulation 333/2007 performance criteria. Products covered: milk, fermented milk products (kefir, yogurt, buttermilk, curds), non-fermented products (cream, condensed milk), maturing cheeses, cottage cheeses, butter, and ice cream. Average concentrations for milk and milk products respectively: Pb 0.008 and 0.017 mg/kg; Cd 0.001 and 0.002 mg/kg; As 0.005 and 0.009 mg/kg; tHg 0.001 and 0.002 mg/kg. All results were well below applicable limits; no RASFF notifications were triggered. The authors concluded that dietary intake of these elements from Polish dairy did not pose a health risk.
Key numbers
All values in mg/kg wet weight. n = 483 total samples from all 16 voivodships; 2006–2007. Accredited methods per EU Reg. 333/2007 and EN ISO/IEC 17025.
Average concentrations (mean across all sampled milk products and all dairy products):
- Pb: milk = 0.008 mg/kg; dairy products = 0.017 mg/kg. EU limit for raw milk: 0.020 mg/kg (Reg. 1881/2006 at time of study).
- Cd: milk = 0.001 mg/kg; dairy products = 0.002 mg/kg. No EU limit for Cd in milk/dairy at time of study.
- tAs: milk = 0.005 mg/kg; dairy products = 0.009 mg/kg. No EU limit for As in milk/dairy.
- tHg: milk = 0.001 mg/kg; dairy products = 0.002 mg/kg. No specific Hg limit for dairy at time of study.
Compliance: No exceedances of the 0.020 mg/kg Pb limit for liquid milk were detected. No comparable exceedances for Cd, As, or Hg (no applicable limits in EU Reg. 1881/2006 for those metals in dairy at time of study).
Regulatory context (as of 2006–2007): Hg in general foodstuffs limited by Reg. 396/2005 at 0.01 mg/kg; Pb in liquid milk at 0.020 mg/kg per Reg. 1881/2006; no EU limits for Cd or As in dairy. The PTWI for Pb was withdrawn by JECFA in 2010, creating the framework for the current no-safe-level guidance.
Methods (brief)
Accredited analytical methods per EU Commission Regulation 333/2007 requirements: LOD < 1/10 of maximum level; LOQ < 1/5 of maximum level (for Pb: LOD < 0.004 mg/kg, LOQ < 0.008 mg/kg since limit = 0.020 mg/kg). Certified reference materials: CRM 8435 Whole Milk Powder (NIST) and CRM BCR 150 Spiked Skim Milk Powder (BCR). Labs accredited to EN ISO/IEC 17025 with internal QC and regular proficiency testing. Sampling per EU Directives 2001/22/EC and Commission Reg. 333/2007.
Implications
Certification: This is the largest national survey of Pb, Cd, As, and tHg in Polish dairy products, providing a clean-market baseline. The average Pb in Polish milk (0.008 mg/kg) is well below the EU limit of 0.020 mg/kg, consistent with industrial-nation dairy baselines. Average tHg (0.001–0.002 mg/kg) is similarly low, contrasting with the fat-concentration effect documented in the Pankiewicz (2012) butter study.
Courses: Model case study for national food safety monitoring programs. The 483-sample cross-voivodship design and accredited methodology make this reference-grade for establishing Polish dairy baseline contamination levels.
App: Contributes to the contamination profiles for milk, yogurt, cheese, and butter in a European (Polish) context.