hrvatski

Određivanje teških metala u hrani životinjskog podrijetla

Due to a high level of application in industrial processes and in household, heavy metals may cause environment pollution and enter the food chain and have a number of adverse effects in animals and humans. Considering that toxic effects of heavy metals on human health are currently very well known, control of their presence is very important. Laboratory for Determination of Residues of the Croatian Veterinary Institute controls the presence of heavy metals in animal tissue and products of animal origin within the National Residue Monitoring Program (NRMP) of the Republic of Croatia, and accepts samples of individual as well as large manufacturers, numerous veterinary and border inspections. Maximum permitted amounts of heavy metals in the Republic of Croatia are set out by the Regulations on Maximum Permitted Amounts of Certain Contaminants in Food (Official Journal Narodne Novine no. 154/2008). Samples of tissue, milk and eggs are before analysis prepared by mineralisation in a microwave oven Anton Paar Multiwave 3000. Concentrations of cadmium, lead, arsenic and copper are determined by means of atomic absorption spectrophotometer Perkin Elmer by use of electro-thermal method (GF-AAS) by measurement at 228.8 nm, 283.3 nm, 193.7 nm and 324.8 nm. Mercury concentration is determined by hydride method (FIAS) and mercury analyzer by direct burning of samples without preparation. In 2008, a total of 1700 samples were tested on heavy metals, out of which 700 within NRMP, and other samples were provided by various manufacturers. Wild game kidney and liver samples (134 samples) were analyzed and concentration of metals above maximum permitted amounts was found: cadmium (0.113 – 20.846 mg/kg) in 102 samples, lead (0.152 – 89.77 mg/kg) in 35 samples and mercury (0.048 – 0.984 mg/kg) in 24 samples. A multiple contamination with heavy metals was found in 35 tissue samples (cadmium+lead, cadmium+mercury, cadmium+mercury+lead). A higher concentration of cadmium was also found in 6 bovine kidneys, 1 pork kidney, 3 samples of calamari and 4 samples of seafood.

teški metali; hrana

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