In this study we assessed the content of nitrates III and V in the 11 sorts of mineral table waters and 7 sorts of the healing waters. The spectrophotometry Griess and Ilosvay' method with cadmium column according to Polish standards was used. We found the presence of nitrates V in all investigated types of waters. 18% of investigated mineral table waters and 40% of healing mineral waters contain nitrates III.
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