PL
Przeprowadzone badania porównania poziomu azotanów i azotynów w pięciu różnych gatunkach warzyw pochodzących z upraw ekologicznych i konwencjonalnych wykazały od półtora do ok. trzech razy niższy poziom azotanów w warzywach z upraw ekologicznych. Poziom azotynów na ogół nie przekraczał maksymalnej dopuszczalnej wartości niezależnie od warunków uprawy warzyw.
EN
Nitrate and nitrite levels and dry mass content of five vegetables (beetroot, white cabbage, parsley root, carrot, potato) were detarmined. The vegetables were obtained from so-called „healthy food" shops or city market in Cracow. The nitrate and nitrite levels were determined by the Griess colorimetry technique as modified by Romminger and Strauss. In all analyzed samples of city-market vegetables, mean nitrate levels were found to be below the maximum admissible level specified in the Ordinance of October 8, 1993, issued by the Minister of Health and Welfare. Mean nitrate content of the „healthy food" vegetables was found to be from 1,5 (cabbage, potato) to 3 (beetroot) times lower than in the conventional plantation vegetables. Only trace amounts of nitrites were detected in the vegetables from the natural plantations, while in the vegetables from the conventional plantations nitrite levels were generally below the maximum admissible level of 1 mg/kg. Besides, the results of our study have confirmed the conclusions of some authors than water content is lower in the natural than in the conventional plantation vegetables.