PL
W całodobowych stołówkowych racjach pokarmowych oraz w tygodniowych racjach odtworzonych oznaczono zawartość toksycznych metali śladowych. Kadm i ołów oznaczono metodą atomowej spektrometrii absorpcyjnej, stosując technikę ekstrakcyjną, natomiast rtęć, posługując się techniką zimnych par.
EN
Twenty four daily alimentary rations from an employers canteen in Lublin and three daily alimentary rations from a Welfare House canteen in Warsaw were examined. From the Chief Census Bureau data on consumption of various food product groups in Poland, food rations typical for blue-collar worker and other families with average incomes living in Poznań, Lublin, Warsaw, Olsztyn and Wroclaw were determined and used as the reference. The food samples were incinerated in a muffle furnace at 450°C and then dissolved in ca. 15% Suprapur hydrochloric acid. Cadmium and lead were determined by flame atomic absorption spectrometry using ammonium pyrrolidine dithiocarbamate (APDC) as complexing agent and 4-methyl-2- pentanone as the organic phase. Mercury was determined by cold vapour atomic absorption spectrometry after wet digestion with nitric and sulphuric acids. Average weekly cadmium intake with the canteen rations was 225 ng, while the reference intakes ranged from 182 µg to 371 µg. Average lead levels in the canteen diets were 805-1057 µg/week, while the reference values ranged from 525 to 1183 µg/week. Average weekly mercury intakes were from 42.7 µg to 55.3 µg (canteen) and from 57.4 µg to 73.4 µg (reference). It has been found that the average intake of the test metals did not exceed the FAO/WHO provisional tolerance weekly intake (PTWI).