Fast spectrophotometric determination of fluoride in ground waters by flow injection using partial least-squares calibration
- Arancibia, Juan Alberto
- Rullo, Anabel
- Olivieri, Alejandro Cesar
- Di Nezio, Maria Susana
- Pistonesi, Marcelo Fabian
- Lista, Adriana Guillermina
- Fernández Band, Beatriz Susana
DOIAbstract
The presence of sulphate constitutes a serious interference in the usual zirconium lake-based spectrophotometric method for the determination of fluoride in water. In this report, full spectral data have been recorded for the zirconium lake of 2-(parasulfophenylazo)-1,8-dihydroxy-3,6-naphthalene- disulfonate (SPADNS) in the simultaneous presence of fluoride and sulphate, as obtained with a flow injection system with a diode-array detector. The information has been processed with partial least-squares (PLS) multivariate calibration. Adequate modeling using a sixteen-sample calibration set allows fluoride to be determined in ground waters by the automated flow injection method, even in the presence of sulphate in concentrations up to 1000 mg ...
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