STUDY ON ORGANIC LIGHT—RARE—EARTH ADSORBENT—CERIUM BIS（OCTYLPHOSPHATE）

The tetravalent metal salts of monoalkyl phosphates[M(R-OPO3)2] are a new kind of stationary phases of chromatography-homogeneous bonded phases.The studies on preparation,structure and gas chromatographic efficiency of cerium bis (octylphosphate) (COPP) are reported in this paper. By using chemical analysis,infrared spectra,x-ray diffraction analysis ,the strong evidence that COPP has a layered structure of the α-zirconium phosphate type was demonstrated,the repetitive unit is C8H17OPO3CeO3POC8H17 and there is a little bending or interpenetration of the alkyl chains within the layers.The thermogravimetic analysis of the COPP indicated that it has much more thermalstability than silica-based packings.The thermodynamic parameters ΔH and molecular connectivity indexes x′ for the adsorption of several dozen compounds on the COPP have also been determined by gas chromatographic method,and the fine linearity between them was shown.