On-line solid-phase extraction and multisyringe flow injection analysis of Al(III) and Fe(III) in drinking water |
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Authors: | Pierre Vanloot Catherine Branger André Margaillan Christophe Brach-Papa Jean-Luc Boudenne Bruno Coulomb |
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Institution: | (1) Laboratoire de Chimie et Environnement (FRE 2704), Université de Provence - Case 29, 3 place Victor Hugo, 13331 Marseille cedex 3, France;(2) Laboratoire de Chimie Appliquée MFS (EA 1356), ISITV - Université du Sud Toulon Var, Avenue Georges Pompidou, 83162 La Garde du Var, France;(3) Institute for Reference Materials and Measurements, Isotope Measurements Unit, European Commission, Joint Research Centre, Retieseweg 111, 2440 Geel, Belgium |
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Abstract: | A new analytical method was developed for on-line monitoring of residual coagulants (aluminium and iron salts) in potable
water. The determination was based on a sequential procedure coupling an extraction/enrichment step of the analytes onto a
modified resin and a spectrophotometric measurement of a surfactant-sensitized binary complex formed between eluted analytes
and Chrome Azurol S. The optimization of the solid phase extraction was performed using factorial design and a Doehlert matrix
considering six variables: sample percolation rate, sample metal concentration, flow-through sample volume (all three directly
linked to the extraction step), elution flow rate, concentration and volume of eluent (all three directly linked to the elution
step). A specific reagent was elaborated for sensitive and specific spectrophotometric determination of Al(III) and Fe(III),
by optimizing surfactant and ligand concentrations and buffer composition. The whole procedure was automated by a multisyringe
flow injection analysis (MSFIA) system. Detection limits of 4.9 and 5.6 μg L−1 were obtained for Al(III) and Fe(III) determination , respectively, and the linear calibration graph up to 300 μg L−1 (both for Al(III) and Fe(III)) was well adapted to the monitoring of drinking water quality. The system was successfully
applied to the on-site determination of Al(III) and Fe(III) at the outlet of two water treatment units during two periods
of the year (winter and summer conditions). |
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Keywords: | Solid-phase extraction Multisyringe flow injection analysis Al(III) Fe(III) Sensitization of complexes |
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