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An apparatus for purifying blood has a blood compartment and a clearance compartment separated by a semi-permeable membrane. The apparatus includes a device containing a cation exchange resin charged with metal ions whose phosphates are insoluble in water. Metal salts of iron, aluminum, zirconium, l

An apparatus for purifying blood has a blood compartment and a clearance compartment separated by a semi-permeable membrane. The apparatus includes a device containing a cation exchange resin charged with metal ions whose phosphates are insoluble in water. Metal salts of iron, aluminum, zirconium, lanthanum, thorium and tin are deposited on a cation exchange material and the charged cation exchange resin is contacted with dialysis liquid. The process of treating blood with the dialysis liquid is also contemplated.

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1. In a method for the preparation of a cation exchanger charged with metal ions adapted for controlling the phosphate level in blood by oral administration, the steps which comprise charging a cation exchanger with from 10% to 100% alkali metal ions before or after it is charged with ions of iron (

1. In a method for the preparation of a cation exchanger charged with metal ions adapted for controlling the phosphate level in blood by oral administration, the steps which comprise charging a cation exchanger with from 10% to 100% alkali metal ions before or after it is charged with ions of iron (III), tin, lanthanum, aluminum or zirconium. 2. The method of claim 1, wherein the said alkali metal ions are sodium and the said metal ions which react with phosphate ions are iron III ions. 3. A phosphate sorbent for oral administration capable of controlling the phosphate level in blood comprising an organic cation exchanger charged with ferric ions in a pharmaceutically acceptable carrier. 4. A phosphate sorbent according to claim 3 comprising a weakly acid organic cation exchanger. 5. The phosphate sorbent of claim 4 wherein the cation exchanger contains carboxylic acid groups, phosphonic acid groups or amidoxime groups. 6. The phosphate sorbent of claim 5 wherein the cation exchanger contains aminocarboxylic acid or iminodicarboxylic acid groups. 7. The phosphate sorbent of claim 5 wherein the cation exchanger contains aminoacetic acid or iminodiacetic acid groups. 8. The phosphate sorbent of claim 3 wherein the cation exchanger is a strongly acid cation exchanger. 9. The phosphate sorbent of claim 3 wherein the cation exchanger has a high degree of cross-linking. 10. The phosphate sorbent of claim 8 wherein the cation exchanger contains sulphonic acid groups. 11. The phosphate sorbent of claim 3 wherein the cation exchanger has a matrix comprising a polymer or a polycondensation product of an aromatic compound, an acryl, a methacryl or a vinyl compound. 12. The phosphate sorbent of claim 3 wherein the cation exchanger has a macroporous matrix. 13. The phosphate sorbent of claim 3 wherein the cation exchanger contains alkali metal ions. 14. The phosphate sorbent of claim 13 wherein the alkali metal ions are sodium ions. 15. The phosphate sorbent of claim 13 wherein the cation exchanger contains calcium or magnesium ions and the alkali metal ions. 16. The phosphate sorbent of claim 3 wherein the pharmaceutically acceptable carrier is a capsule having a cationic semipermeable wall.