| On the basis of a review of the current situation and progress on separationand enrichment methods of indium at home and abroad, according to thecharacteristic that there are special functional groups in the molecule of exchangefiber, they can adsorb some metal ion selectively on right condition, make themseparate from other ions. So, in this paper, use polypropylene based cation ionexchange fiber, polypropylene based anion exchange fiber, sulfhydryl cotton andcotton cellulose xanthate to separate and enrich trace indium form various matrixbefore determination by graphite furnace atomic absorption spectrometer(GFAAS)were investigated.1 A method of enrich trace indium by polypropylene based cation ionexchange fiber was studied. The conditions of enrichment and eluent wereoptimized. When the pH of pregnant solution was 2～4, indium was enrichedquantitatively at the flow rate within 16 mL·min-1.Then it was desorbed from thecolumn completely by 10 mL 1.8 mol·L-1 HNO3. The saturated capacity was32.23mg·g-1. The method was used to enrich trace indium in water samples,artificial samples and.zinc concentrate. The detection limit was 0.023 ng·mL-1, therecovery was 96.8％～101％, the RSD was between 0.1％～2.1％, the enrichmentmultiple was from 5 to 3.3×103.2 The factors for enrichment of trace indium by polypropylene based anionexchange fiber were investigated. The results showed that in HBr solution, whenpH=4 and flow rate within 6 mL·min-1, indium can be enriched quantitatively.Then it was desorbed form the column by 6 mL 1.0 mol·L-1 HNO3. The saturatedcapacity was 1.32 mg·g-1. The method was used to enrich trace indium in watersamples, artificial samples and zinc concentrate. The detection limit was 0.08ng·mL-1, the recovery was 96％～102％, the RSD was between 0.6％～3.9％, the enrichment multiple was from 6 to 251.3 The factors for enrichment of trace indium by sulfhydryl cotton wereinvestigated. The results showed that in HNO3 solution, when pH=4 and flow ratewas 3～4 mL·min-1, indium can be enriched quantitatively. The loaded indium waseluted quantitatively by 10mL 0.8 mol·L-1 HNO3. The saturated capacity was 181μg·g-1. The method was used to enrich trace indium in water samples, artificialsamples and zinc concentrate. The recovery was 92.8%～101%, the RSD wasbetween 0.4%～2.7%, the enrichment multiple was from 58 to 4.9×103.4 The factors for enrichment of trace indium by cotton cellulose xanthatewere investigated. The results showed that in HCl solution, when pH=5 and flowrate within 14 mL·min-1, indium can be enriched quantitatively. The loaded indiumwas eluted quantitatively by 10 mL 0.05 mol·L-1 HNO3. The saturated capacitywas 433μg·g-1. The method was used to enrich trace indium in water samples,artificial samples and zinc samples. The recovery was 97.4%～112.6%, the RSDwas between 0.6%～3.1%, the enrichment multiple was from 10 to 68.
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