This implies that excretion is fairly rapid, and this is supported by intratracheal studies in rats [44] and hamsters [45], where whole-body clearance of administered arsenate or arsenite occurred with a half-time of 1 day or less. However, the study in rats [44] found that the clearance was biphasic, with 95% cleared with a half-time of 29 minutes and the remaining arsenic cleared with a halftime of 75 days.