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

摘要

A new poly(acrylphenylamidrazone phenylhydrazide) chelating fiber is synthesized from polyacrylonitrile fiber and used for preconcentration and separation of trace Ga(II1), In(III), Bi(III). V(V) and TO IV) from solution (5-50 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 fiber at a 4 ml min1 flow rate in the pH range 5-7 with recoveries >95%). These ions can be desorbed quantitatively with 20 ml of 4 M hydrochloric acid at 2 mlmint from the fiber column. When the fiber which had been treated with concentrated hydrochlo-ric 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 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 real solution samples determined by this method were in agreement with the certified values of the samples with average errors <3.7%.