[Content of nitrates (V) and nitrites (III) in some vegetables grown in the region of Warmia and Mazury].

The aim of this paper was to determine the concentration of nitrates (V) and nitrites (III) in some vegetables originating from producers from the province of Warmia and Mazury and in commercial samples provided by a plant producing frozen vegetables situated in the region. Nitrates and nitrites were measured using the spectrometric method according to the methodology described in the Polish Standard PN-92/A-75112. The analyzed vegetables had small amounts of the examined compounds, which were considerably lower than those reported by other authors.

[Levels of polychlorinated biphenyls in human milk in dependent on selected factors].

The contents of polychlorinated biphenyls in human milk were determined. The PCB levels in human milk were determined in relation to factors such as: age and weight of women, birthweight of the baby, smoking, period of breast-feeding (3-5 days, 2-4 weeks, 6-8 month) and seasons of the year. It was found that level of PCB in human milk have been decreasing during lactation.