 For oral absorption , <unk> ( 1994 ) recommended values of 10 % for tartar emetic and 1 % for all other antimony compounds . <unk> absorption for metals is estimated at most 1 % ( <unk> , 2007 ) . Inhalation absorption of antimony trioxide and other poorly soluble Sb ( III ) substances ( such as antimony dust ) is estimated at 6 @.@ 8 % ( <unk> , 2008 ) , whereas a value < 1 % is derived for Sb ( V ) substances . Antimony ( V ) is not <unk> reduced to antimony ( III ) in the cell , and both species exist simultaneously . 
