Polyurethane foam (PUF) open cell, polyether type, was obtained from the commercial product (Vulcan of Brazil ± VCON 202, 42% resilience and 10±12 cell/ linear cm). In order to use PUF as sorbent, the foam was broken into small pieces in a blender with demi-neralized water and washed with 6 mol/l HCl for elimination of tin and lead [16,19]. A minicolumnwas packed by using 125 mg of PUF in a small plastic tube of 3.0 cm length3 mm i.d.