Estudo de sorção de herbicidas pelos argilominerais vermiculita e montmorilonita

Abstract

Recebido em 13/11/09; aceito em 5/7/10; publicado na web em 9/11/10 SORPTION STUDY OF HERBICIDES WITH THE CLAY MINERALS VERMICULITE AND MONTMORILLONITE. The clay minerals montmorillonite (MT) and vermiculite (VT), previously treated with Ca 2+ , K + and Na + , were employed in a sorption study with herbicides. The herbicides 2,4-D, diuron, alachlor and metolachlor showed no interaction with MT and VT. On the other hand, the triazines presented a good sorption process, close to 100% for ametrine removal and near to 56 and 69% for atrazine and simazine, respectively, by MT. These results suggest that the MT specie may be a good material for triazines removal from aqueous medium and an alternative phase to preconcentration process, besides to exhibit a good selectivity.