Abstract

DEVELOPMENT OF A SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF OXALIC ACID

Alaa Alshikh Mohamad* and Joumaa Al- Zehouri

Abstract

New, simple, sensitive, accurate, and specific spectrophotometric method has been developed for the determination of oxalic acid. The developed method, is a chemical derivatization method involving the action of a free carboxylic acid in oxalic acid, sodium nitrite releases nitrous acid which diazotizes sulfanilamide, and a red diazonium salt is developed with α- aphthylamine. exhibiting maximum absorption (λ max) at 482 nm. The effects of reaction time, reagent concentration and volume on the absorption of the complexes formed have been examined. Beer,s law is obeyed over concentration ranges of (2-48) μg/ml (R2= 9972). The precision as RSD ˃ 2%, and accuracy was determined the value of the recovery (99.66)%. The equivalent acid content was measured volumetrically by potassium permanganate for comparison and to ensure the accuracy and validity of the method.

Keywords: oxalic acid, chemical derivatization, spectrophotometr, ?-naphthylamine.