title: Improved dye procedure for determining urea concentration by using o-phthalaldehyde and naphthylethylenediamine.
mesh_terms: D000447:Aldehydes; D003124:Colorimetry / Q000379:methods; D004396:Coloring Agents; D005029:Ethylenediamines; D006801:Humans; D007202:Indicators and Reagents; D014508:Urea / Q000032:analysis*; D009764:o-Phthalaldehyde
chemical_list: D000447:Aldehydes; D004396:Coloring Agents; D005029:Ethylenediamines; D007202:Indicators and Reagents; C008588:N-(1-naphthyl)ethylenediamine; D009764:o-Phthalaldehyde; D014508:Urea