[Content estimation of nitrates and nitrites in vegetables from the province of Lodz]

The contents of nitrates and nitrites in selected vegetables reaped in summer and autumn in 1993 were investigated. The samples of vegetables were collected directly from the producers from area of Lódź and from outside of the city. Nitrates were reduced on a cadmium column to nitrites, where-upon they were determined colorimetrically using sulfanilic acid and N-1-Naphthylethylenediamine. It has been found that the contents of nitrates in tested vegetables are mostly higher than the allowable values published in the Ordinance of Minister of Health and Social Welfare from 8th of October 1993. The average contents of nitrates and nitrites in most of tested vegetables were higher in the vegetables from the outskirts of the city than in ones from outside of the city in the province.