Extraction de l'acide oxalique par formation de paires d'ions et application au dosage de l'acide oxalique urinaireExtraction of oxalic acid by ion-pair formation with application to the determination of oxalic acid in urine |
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Authors: | Y Pegon JJ Vallon |
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Institution: | Departement de Chimie Analytique Chimie Générale et Minérale et Bromatologie, Faculté de Pharmacie, 8, Avenue Rockefeller, 69373 Lyon Cédex 2 France;Laboratoire de Biochimie, Toxicologie et Analyse des Traces, Hôpital Edouard Herriot, Place d''Arsonval, 69374 Lyon Cédex 2 France |
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Abstract: | Extraction of oxalic acid by ion-pair formation with application to the determination of oxalic acid in urineThe yield of ion-pair extraction of oxalic acid by trioctylamine and triisooctylamine in chloroform depends on the pH of the aqueous phase. The optimum pH is 2.7, proving that hydrogenoxalate ion is the extractable form. Extraction yield depends on the acid used for pH adjustment and dissolution of the calcium oxalate formed in complex medium. The best results are obtained with hydrochloric and sulfuric acids and with trioctylamine extraction. This extraction was applied to oxalic acid determination by colorimetry and gas chromatography in urines from twenty healthy patients. Mean excretion was found to be Extraction yields lie between 94 and 106%. |
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