关键词: 偶氮氯膦-mA, 螯合纤维, 稀土元素

Abstract: The selectivity of CPA-mA, a chelate reagent, is about the same for all REEincluding Y.The VS-2 fiber, being basic anion exchange fiber, has larger exchanging capacity and faster exchanging with CPA-mA.The CPA-mAchelate-forming fiber has been prepared by means of combining CPA-mAwith VS-2 fiber in this paper.The stability of the CPA-mAfiber was studied and the test results shown that the fiber was stable in the solutions of ClO₄^-, CO₃^2-, SO₄^2-, Cl^- and CH₃COO^- with pH1.0, respectively.The exchanging capacity of VS-2 fiber with CPA-mAis about 0.26 mmol/g.The CPA-mAchelate-forming fiber can be used to separate and preconcentrate the trace amounts of REE.The experiment results have demonstrated that REEcould be separated from a large quantities of matrix elements without elution under the given experiment conditions.The pHof the analyzed solutions was 1.0 to 2.0, the flowing speed was more than 12mL/min, it is many times as fast as the analogous resins.The cations, such as ions of Fe, Ca, Al, Mn, Cu, Pb, Co, Ni, Th, Zr and Vetc., do not have influence on the separating REEwith CPA-mAfiber under the condition of existing ascorbic acid, EDTA, CyDTAand EGTA.The test results have shown that the CPA-mAfiber was characterized by litter interelement interference, larger exchanging capacity and lower cost when it was used to separate and preconcentrate the trace REEin complex.It is an effective substance for separating the rare earth elements.

Key words: CPA-mA, Chelate fiber, REE