روزنامه با شماره پیاپی سال 2001

-230

231

0

A new po1y(acrylphenylamidrazone phenylhydrazide) chelating fiber is synthesized from polyacrylonitrile fiber and used for preconcentration and separation of trace Ga(III), In(III), Bi(III), V(V) and Ti(IV) from solution (5-50ngml-1 Ti(IV) or V(V) and 50-500ngml-1 Ga (III), In (III) or Bi(III) in 1000-100ml of solution can be enriched quantitatively by 0.15g of fiber at a 4mlmin-1 flow rate in the pH range 5-7 with recoveries >95%). These ions can be desorbed quantitatively with 20ml of 4M hydrochloric acid at 2mlmin-1 from the fiber column. When the fiber which had been treated with concentrated hydrochloric acid and washed with distilled water until neutral was reused eight times, the recoveries of the above ions by enrichment were still >95%. Two-hundred-fold to 10000-fold excesses of Cu(II), Zn(II), Ca (II), Mn(II), Cr(III), Fe(III), Ba(II) and Al(III) caused little interference in the determination of these ions by inductively coupled plasma-atomic emission spectrometers (ICP-AES). The relative standard deviations for enrichment and determination of 50ngml-1 Ga, In or Bi and 10ngml-1 V or Ti are in the range 1.2-2.7%. The contents of these ions in real solution samples determined by this method were in agreement with the certified values of the samples with average errors <3.7%.

Analytica Chimica Acta

2001

Analytica Chimica Acta