EFFICIENCY OF A NEW POLY(ACRYLAMIDRAZONE-HYDRAZIDE LACMOID) CHELATING FIBER FOR PRECONCENTRATING AND SEPARATING TRACES OF CHROMIUM, GALLIUM, INDIUM AND TITANIUM FROM SOLUTIONS - DETERMINATION BY ICP-OES

A new poly(acrylamidrazone-hydrazide lacmoid) chelating fibre has been synthesized from poly-acrylonitrile fibre and used for the preconcentration and separation of traces of Cr(III), Ga(III), ln(III) and Ti(IV) from solutions with satisfactory results. These ions can quantitatively be enriched by the chelating fibre at a flow-rate of 6 ml/min at pH 6, and quantitatively desorbed with 10 ml of eluent at a rate of 4 ml/min. The chelating fibre reused ten times can still quantitatively concentrate traces of the above ions; twenty to two hundred-fold excesses of coexistent ions caused only little interference. With concentrations of 10 ng/ml Cr(III) and Ti(IV), and 50 ng/ml Ga(III) and In(III), the RSD was in the range of 1.4-4.6%. The contents determined in real samples were generally in agreement with the results obtained by HG-AAS; the recoveries of added standards were > 96%.