Indirect Colorimetric Estimation of Fluoride Ion in Water and Pharmaceutical Preparation Samples
Rafidain Journal of Science,
Volume 28, Issue 2, Pages 84-89
AbstractAn indirect method for the estimation of fluoride ion has been developed.The method is based on the bleaching action of fluoride ion on the color of Ti (IV)with 2-hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthanic acid (HHSNNA) complex with proportional decrease of absorbance. Therefore,the decrease in color intensity is proportionalto the concentration of fluoride ion. Molar absorptivityis 0.1166×104 l. mol-1.cm-1 atwavelength 685 nm. Beer's lawis obeyed over the concentration range of 0.2-4 µg/ml.The proposed method is applied successfullyto determine fluoride ion in different real water samples andpharmaceutical preparations (Tablets). The proposed method is compared favorably with Eriochrome cyanine R – Zirconium method .
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