TABLE 1 SHOWED THAT CHITOSANS COULD ADSORB BOTH THE METALIONS AND THE METAL HYDROXIDE COLLOIDS.THE ADSORPTION OF MANGANESE IONS FROM SOLUTION IS ONE ORDER HIGHER THAN THAT FROM COLLOIDS FOR 85% DD CHITOSAN AND SLIGHTLY HIGHER FOR 95% DD CHITOSAN, WHERE AS COPPER IONS WERE MORE READILY ADSORB ED AFTER 20 MIN AT ROOM TEMPERATURE THAN COPPER HYDROXIDE COLLOIDS WERE.COMPARED TO IRON AND MANGANESE,THE CHITOSANS ADSORBED MUCH LESS MANGANESE IONS AND THE CORRESPONDING METAL COLLOIDS. THE METAL COLLOID OF IRON WAS ALMOST COMPLETELY ADSORBED BY THE CHITOSANS AT TWO ADSORPTION CONDITIONS, BUT THE ADSORBED METAL COLLOIDS OF COPPER AND MANGANESE BY CHITOSANS WERE HIGHER AFTER ADSORBED 20 MIN AT ROOM TEMPERATURE FOLLOWED BY 120 MIN AT 80 ◦C THAN THAT OF ADSORBED 20 MIN AT ROOM TEMPERATURE. THE CHITOSAN WITH ADD OF 95% COULD ADSORB MORE METALS THAN THE CHITOSAN WITH ADD OF 85% COULD. FOR CHITOSANS, THE ABILITY OF ADSORPTION OF METALS RELATED TO THE FREE AMINO-GROUP (NH2). In chitosans (Burke etal.,2000;Parketal., 2004; Xueetal.,1998). The chitosan with a higher DD has more free amino-group, so it can adsorbed more metals.