Levels of "toxic" and "essential" metals in samples of bovine milk from various dairy farms in Calabria, Italy.
The aim of this research was to evaluate the possible contamination by heavy metals of milk from cows bred on various farms in Calabria. The concentrations of heavy metals were determined in 40 samples of bovine milk from the various dairy farms. Each sample, homogenized and powdered, was mineralized in a microwave oven. Quantitative analyses of Cd, Cr, Cu, Pb and Se were performed using an atomic absorption spectrophotometer with graphite furnace; As was analyzed by hot vapor generation technique and Zn with the flame method. As regards toxic heavy metals, highest values are those of As (g.m. 37.90 microg/kg w.w.) and Pb (g.m. 1.32 microg/kg w.w.), while lowest concentrations are those of Cd (g.m. 0.02 microg/kg w.w). With regard to essential metals, Zn (g.m. 2016 microg/kg w.w) and Se (g.m. 13.24 microg/kg w.w.) showed the highest concentrations, followed by Cr (g.m. 2.03 microg/kg w.w.) and Cu (g.m. 1.98 microg/kg w.w.). Further investigations of the levels of heavy metals (As) in a greater number of milk samples from various zones of Calabria are necessary, both to examine this problem from the clinical epidemiological point of view and to identify the possible causes of milk contamination.
Licata
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P
Department of Veterinary Public Health, Section of Veterinary Pharmacology and Toxicology, University of Messina, Polo S.S. Annunziata, 98168 Messina, Italy.
Trombetta
D
D
Cristani
M
M
Giofrè
F
F
Martino
D
D
Calò
M
M
Naccari
F
F
D000818:Animals; D002417:Cattle; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000302:isolation & purification*; D005506:Food Contamination; D007558:Italy; D019216:Metals, Heavy / Q000302:isolation & purification*; D008892:Milk / Q000737:chemistry* / Q000592:standards
D004785:Environmental Pollutants; D019216:Metals, Heavy