METAL PHOSPHATE (M=Zr, Ce) COMPOSITE MATERIALS FOR THE SEPARATION, CONCENTRATION AND DETECTION OF TRACE Pb (II) IN WATER.

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Zr (IV) and Ce (IV) phosphates were incorporated into organic supports and applied to the selective adsorption of Pb (II). α-Zirconium phosphate (ZrP) was loaded into porous Amberlite XAD-7 and used for the column enrichment of Pb (II) (10ppb) from aqueous solution. The recovery efficiency was dependent on the pH and the feeding rate of the sample solution. A Pb (II) selective membrane filter was fabricated by blending Ce (IV) phosphate (CeP) with cellulose fiber. Enrichment of Pb (II) was achieved by filtration of the aqueous sample through the membrane and was visually detected by immersing the membrane in a 3% solution of Na₂S. A dark spot was observed at Pb (II) concentrations as low as 5 ppb.