[Value of nitrates and nitrites in selected vegetables and potatoes sold in the marketplace of Białystok in the years 1991-1992].

Nitrate and nitrite contents were determined in selected vegetables and potatoes from the market in Białystok and from ecology cultivation in the years 1991-1992. The modified Griess method was used for determination of nitrate. The results showed that the nitrate contents in red beets, cabbages, parsley, carrots, celery and potatoes, were higher than the suggested limit in Poland. In the group of vegetables from special cultivation plots, the nitrate contents also exceeded the maximal permissible level. Low nitrite concentrations were found in the studied vegetables.