EN
The examinations included milk delivered from 22 gathering stations of the Dairy Products Factory in Siedlce. In total 154 milk samples were tested. The concentration of lead (Pb) and cadmium (Cd) in milk was determined by atomic absorption spectroscopy. Residual antibiotics with beta-lactam ring were assessed by the Penzym test, while a quick diffusion test was used to discover the presence of inhibiting substances. The average amount of lead was 0.045 mg per 1 kg and Cd - 0.0035 mg per 1 kg. The heighest level of lead was noted in March (0.062 mg) and the lowest in December (0.019 mg) while for cadmium in March and May (0.0043 mg) and the lowest one in September (0.0022 mg). Inhibiting substances were found in 25 samples and residues of the antibiotics in 10 samples (6.5%).