| arsenic, cadmium, chromium, lead, mercury, and selenium levels in blood of four species of turtles from the amazon in brazil. | using blood as a method of assessing metal levels in turtles may be useful for populations that are threatened or endangered or are decreasing. in this study the levels of arsenic (as), cadmium (cd), chromium (cr), lead (pb), mercury (hg), and selenium (se) in blood of four species of turtles from the tributaries of the rio negro in the amazon of brazil were examined. the turtles included the six-tubercled amazon (river) turtle (podocnemis sextuberculata), red-headed amazon (river) turtle (podoc ... | 2010 | 19953418 |