SILICA-IMMOBILIZED FORMYLSALICYLIC ACID AS A SELECTIVE PHASE FOR THE EXTRACTION OF IRON(III)

The immobilization of formylsalicylic acid compounds on the surface of amino group-containing silica gel phases is described. The resulting phases were tested for the extraction of iron(III) and showed an excha nge capacity of 0.95-0.96 mmol g(-1). The other metal ions tested show ed lower metal capacity values than iron(III). The selectivity of the phases tested for the extraction of iron(III) from a mixture containin g several other metal ions was evaluated using atomic absorption spect rometry. A method for the recycling of immobilized silica gel after me tal extraction is described for practical applications.