SYNTHESIS OF POLY(N-AMINOETHYL)ACRYLAMIDE CHELATING FIBER AND PROPERTIES OF CONCENTRATION AND SEPARATION OF NOBLE-METAL IONS FROM SAMPLES

A new kind of poly(N-aminoethyl)acrylamide chelating fiber was synthes ized from nitrilon (an acrylonitrile-based synthetic fiber) and used f or the concentration and separation of traces of noble metal ions from solution. The results showed that 16-80 ng ml(-1) of Au(III), Pt(IV), Pd(IV), Ir(IV), Ru(III) and Rh(III) can be quantitatively concentrate d by the fiber up to a flow rate of 20 ml min (-1) at pH 3, and can be desorbed quantitatively with an eluting agent from the fiber column w ith recoveries of 96-100 %. For a fiber reused 10 times, the recoverie s of these ions were still over 94%, and a 100-1000 times excess of Fe (III), A1(III), Ca(II), Mg(II), N1(II), Co(II), Cu(II) and Zn(II) caus ed no interference in the determination of these ions by inductively-c oupled plasma atomic emission spectrometry. The capacities of the fibe r for the analytes were in the range 0.80-2.62 mol g(-1). The relative standard deviation of the method was between 0.02% and 2.6%. Recoveri es of a standard added to a real sample were 96.8-99.2%. The average e rror for the analysis by this method for a powder sample was less than or equal to 3.50%. The IR spectra of the analyte-bearing fiber showed that these ions coordinated to nitrogen sites in the fiber.