Heavy metals conten monitoring in frozen vegetables | Sledovanie obsahu ťažkých kovov v mrazenej zelenine
2009
Szabóová, G., Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Tomáš, J., Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Harangozo, Ľ., Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Krížová, L., Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Árvay, J., Slovak Univ. of Agriculture in Nitra (Slovak Republic)
Frozen vegetables such as fresh vegetables, as a group, are low fat, low energy, relatively low protein, but are high carbohydrate, high fibre foods which provide significant levels of certain micronutrients to the diet. The monitoring of heavy metals content in vegetables is very important because vegetable consumption is high. The aim of this research was to classify heavy metals (Cd, Pb, Zn, Cu and Hg) content of chosen kinds of freeze-dried frozen vegetables on the base of results chemical analysis. The metals are extracted from their matrix by using nitric acid in a closed-vessel microwave digestion system for their subsequent detection by flame atomic absorption spectrometry (FAAS). The mercury contents was determined direct at AMA 254 apparatus. Obtained results of heavy metals content were compared with their maximum admissible amounts by Slovak standards. The content of Cd has been excess in the samples frozen peas (0.08 mg per kg), leek (0.10 mg per kg), cauliflower (0.13 mg per kg), broccoli (0.02 mg per kg), sweet maize (0.13 mg per kg). The content of Pb has been excess in the samples frozen peas (0.25 mg per kg), brussels sprouts (0.17 mg per kg), sweet maize (0.11 mg per kg). Most significant allowable quantity of heavy metals, specified with the norms of Food codex of Slovak Republic, was not discovered in other frozen vegetables samples.
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