Inorganic elements profiling in milk from buffalo farms of the Campania Region (Italy)

Bulk milk samples from 69 dairy buffalo farms of the Campania Region, Italy were drawn for the determination of 20 selected elements by ICP-MS. The main goal was to ascertain how the agricultural soil geo-chemistry could influence the milk pattern with respect to feeding practices. Local forages (N = 207) and groundwater (N = 486) were analyzed too to recover the feeding-to-milk carry-over rates (COR) of selected elements and identify the main contributors to milk contamination. Left censored data >10% limited to 11 elements (Mn, As, Se, Sr, Zn, Cr, Fe, Co, Ni, Cu, and V) the multivariate system approach based on cluster and factor analysis. We identified 8/11 elements - Sr, Mn, Zn, Co, Se, Cr, Fe, and V - explaining the main quote of variation observed among farms milk pattern. In particular, Co resulted as discriminant for specific villages of the Salerno Province. On median values, cereals (34%) and feed supplement (31%) represented the main contributors to Cr intake; for V, hay (46%) and water (42%); for Fe, water (46%); for Se, Co and Zn, mineral supplements (67; 73; 82%); for Sr, hay (71%), for Mn, mineral supplements (36%) and water (30%). Median CORs rates (%) were the following: Se and Cr: 40; V: 13; Mn: 5.2; Sr: 4.7; Zn: 3.7; Co: 3.4; Fe: 1.6; respectively. The factor analysis could trace the geographical origin of buffalo milk at farm level, according to similar management practices, partially irrespective of the municipality/province level.