Chlorination of bisphenol A: kinetics and by-products formation.
The kinetics of initial chlorination of bisphenol A (BPA) was studied between pH 2 and 11 at room temperature (20 +/- 2 degrees C). pH Profile of the apparent second-order rate constant of the reaction of BPA with chlorine were modeled considering the elementary reactions of HOCl with BPA species and an acid-catalyzed reaction. The predominant reactions at near neutral pH were the reactions of HOCl with the two phenolate species of BPA (k = 3.10 x 10(4) M(-1)s(-1) for BPA- and 6.62 x 10(4) M(-1) s(-1) for BPA(2-)). At near neutral pH, half-life times of BPA were calculated to be less than 1.5 h for chlorine residual higher than 0.2 mg l(-1). Chlorination of synthetic treated waters spiked with BPA showed that BPA disappeared within 4 h and that chlorinated bisphenol A congeners were rapidly formed and remained in solution for up to 10-20 h when low chlorine dosages are applied (0.5-1 mg l(-1)). To limit their presence in drinking water networks, it is then necessary to maintain high chlorine residuals that rapidly produce and decompose chlorinated bisphenol A congeners.
Gallard
Hervé
H
Laboratoire de Chimie de l'Eau et de l'Environnement, UMR CNRS 6008, Ecole Supérieure d'Ingénieurs de Poitiers 40, Avenue du recteur Pineau, 86 022 Poitiers Cedex, France. herve.gallard@univ-poitierse.fr
Leclercq
Amélie
A
Croué
Jean-Philippe
JP
D001559:Benzhydryl Compounds; D002713:Chlorine / Q000737:chemistry*; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D010636:Phenols / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D002713:Chlorine; D010636:Phenols; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds