Spectrophotometric determination of fluoride in drinking water using aluminium complexes of triphenylmethane dyes

A sensitive spectrophotometric determination of fluoride in drinking water has been developed using aluminium complexes of triphenylmethane dyes (chrome azurol B and malachite green) as spectrophotometric reagents. The method allowed a reliable determination of fluoride in the range of 0.5-4.0 mg.l^sup -1^ for chrome azurol B and 0.0-2.0 mg.l^sup -1^ for malachite green. The molar absorptivity for the complexes of chrome azurol B at 582 nm and malachite green at 622 nm is 1.44 × 10^sup 4^ and 2.56 × 10^sup 4^ l.mol^sup -1^.cm^sup -1^, respectively. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.5 mg.l^sup -1^ fluoride for the method using chrome azurol B were found to be 0.125 ± 0.003 µg.ml^sup -1^, 0.2 mg.l^sup -1^, 0.5 mg.l^sup -1^, and 97.1 ± 4.2, respectively, and for malachite green were 0.143 ± 0.002 µg.ml^sup -1^, 0.1 mg.l^sup -1^, 0.3 mg.l^sup -1^, and 97.9 ± 4.1, respectively. Keywords: Fluoride analysis, spectrophotometric method, drinking water, aluminium triphenylmethane dye complexes, chrome azurol B, malachite green.

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