[The evaluation of nitrate and nitrite contents in diets of preschool children]. / Zawartosc azotanów i azotynów w calodziennych racjach pokarmowych dzieci w wieku przedszkolnym.

The contents of nitrites and nitrates in whole day's food of children at preschool age have been examined. Meals consisted of three dishes were taken from one of the day nurseries in Lódz in January 1996. In the evaluation of the degree of exposure the highest permissible daily intake was considered of nitrites (0.2 mg NaNO2) and nitrates (5 mg KNO3) for kg of body weight and assumed average body weight was 20 kg for children. The contents of nitrites and nitrates were determined spectrophotometrically on the basis of Griess reaction. Nitrates were reduced to nitrites passing anaquelos extract of the studied sample through a column filled with cadium dust. The range of quality of collected nitrates in meals in wide and the quantity oscillate between 8.9 and 127, mg KNO3, the average quantity is 55.01 mg KNO3. The quantity of collected nitrites is between 0.5 and 3.8 mg NaNO2 and the average quantity is 1.58 mg NaNO2.

[The evaluation of nitrates and nitrites in daily food intake of adults]. / Zawartosc azotanów i azotynów w calodziennych racjach pokarmowych ludzi doroslych.

During the research work the contents of nitrates and nitrites in whole day's food of adults were examined. The study were carried out in February 1996. In the evaluation of the degree of exposure highest permissible daily intake was considered of nitrites (0.2 mg NaNO2) and nitrates (5 mg KNO3) for one kg of body weight, and the assumed average body weight was 60 kg for adults. The contents of nitrites and nitrates were determined spectrophotometrically of the basis of Griess reaction. Nitrate was determined colorimetrically using sulphanic acid and N-1-naphtyl-ethylene-diamine. The quantity of collected nitrates and nitrites in whole day's food oscillates between 69.5 and 737.5 mg KNO3 and the average quantity is 304.55 mg KNO3. The quantity of collected nitrites is in the average 1.8-8.4 mg NaNO2, and the average quantity is 4.39 mg NaNO2.

[Content estimation of nitrates and nitrites in vegetables from the province of Lodz]. / Ocena zawartosci azotanów i azotynów w warzywach pochodzacych z terenu wojew-odztwa L-odzkiego.

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 Lódz 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.

[Studies on the contents of nitrates and nitrites in selected fresh and heat processed vegetables]. / Badania zawartosci azotanów i azotynów w wybranych warzywach surowych oraz poddanych obróbce termicznej.

The levels of nitrates and nitrites were determined in fresh vegetables and the same products subjected to culinary processing such as boiling. Nitrates were reduced on a cadmium column to nitrites, where upon they were determined colorimetrically using sulfanilic acid and N-1-naphthyl-ethylenediamine. Thermal processing of these vegetables reduced the level of nitrates by about 50% and the nitrites loss reached even 100%.