Efficiency and mechanism of new poly (acryl-phenylamidrazone phenylhydrazide) chelating fiber for adsorbing trace Ga, In, Bi, V and Ti from solution

A new poly(acrylphenylamidrazone phenylhydrazide) chelating fiber is synthe sized from polyacrylonitrile fiber and used for preconcentration and separa tion of trace Ga(III), In(Ill), Bi(III), V(V) and Ti(IV) from solution (5-5 0 ng ml(-1) Ti(IV) or V(V) and 50-500 ng ml(-1) Ga(III), In (III) or Bi(III ) in 1000-100 ml of solution can be enriched quantitatively by 0.15 g of fi ber at a 4 ml min(-1) flow rate in the pH range 5-7 with recoveries > 95%). These ions can be desorbed quantitatively with 20 ml of 4 M hydrochloric a cid at 2 ml min-1 from the fiber column. When the fiber which had been trea ted with concentrated hydrochloric acid and washed with distilled water unt il neutral was reused eight times, the recoveries of the above ions by enri chment were still > 95%. Two-hundred-fold to 10 000-fold excesses of Cu(II) , Zn(II), Ca(II), Mn(II), Cr(IB), Fe(III), Ba(II) and Al(III) caused little interference in the determination of these ions by inductively coupled pla sma-atomic emission spectrometers (ICP-AES). The relative standard deviatio ns for enrichment and determination of 50 ng ml(-1) Ga, In or Bi and 10 ng ml(-1) V or Ti are in the range 1.2-2.7%. The contents of these ions in rea l solution samples determined by this method were in agreement with the cer tified values of the samples with average errors <3.7%. (C) 2001 Elsevier S cience B.V. All rights reserved.