Extractive-spectrophotometric determination of furosemide with sodium 1,2-naphthoquinone-4-sulphonate in pharmaceutical formulations
ABSTRACT An extractive-spectrophotometric study based on the reaction of furosemide with 1,2-naphthoquinone-4-sulphonate (NQS) is described. Optimal conditions are: NaH2PO4-Na2HPO4 pH 7.5, NQS 7.7×...