| abstract |
A method for preparing test means for the determination of the urea content of fluids, which method comprises incorporating, to a strong carrier matrix loaded with cation exchange resin, which is in its acid form, separate first and second reagents together by means of a polymeric material, said first reagent comprising ortho-phthalic aldehyde and said second reagent comprising 3-hydroxy-1,2,3,4-tetrahydrobenzo [h] quinoline, 3-acetoxy-1,2,3,4- tetrahydrobenzo [h] quinoline, or its dihydrochloride salts. |