PL
W kilkunastu odmianach ziemniaków uprawianych przez trzy kolejne lata w SDOO w Węgrzcach k/Krakowa oznaczano zawartość azotanów, azotynów oraz kadmu i ołowiu. Poziom azotanów wynosił średnio 229 mg/kg, a azotynów 2,3 mg/kg i w obu przypadkach zależał od warunków pogodowych. Zawartość ołowiu wynosiła średnio 0,181 mg/kg, a kadmu 0,061 mg/kg. Analiza statystyczna nie wykazała wpływu warunków atmosferycznych ani odmiany na zawartość metali ciężkich. Nie stwierdzono też korelacji pomiędzy zawartością azotanów i azotynów a poziomem ołowiu i kadmu w badanych ziemniakach.
EN
Nitrate, nitrite, lead and cadmium contents were determined in 16 potato varieties grown in 1990-1992 at a location near Cracow. Nitrate content of fresh potato tubers ranged from 57 to 842 mg KNO3/kg wet wt., 229 mg/kg mean. In about 29% samples, the detected nitrate content was higher than the 250 mg/kg level admissible for potatoes. Nitrite content in the tubers was 0.3-5.7 mg NAO2/kg, 2.3 mg/kg mean. There was a strong and significant relationship between nitrate and nitrite levels in the potatoes and the atmospheric conditions prevailing during the year in which they had been raised. All test samples were found to contain lead and cadmium. Mean lead content was 0.181 mg/kg, but in 28% test samples lead levels were higher than the 0.250 mg/kg admissible level. Mean cadmium content was 0.061 mg/kg; levels higher than the admissible 0.050 mg/kg value were found in as much as 40% test samples. The statistical analysis did not reveal any significant effect of potato variety or year of cultivation on the content of the heavy metals in the test potatoes. No correlation was found between nitrate or nitrite content and lead or cadmium levels in the test potato tubers.