“…Previous occupational studies have determined urinary levels of vanadium, chromium, nickel, and other metals in exposed workers [White et al, 1987;Hauser et al, 1998;Lucchini et al, 1999;Domingo et al, 2001]. As with other urinary biomarkers, metal exposure using urine samples includes all possible routes of exposure and provides an assessment of biological absorbed dose.…”