Study of the transformation of two salicylates used in personal care products in chlorinated water

• Type: Article in International Scientific Journal
• Date: 2014

Authors

de oliveira e sa, mm (Author) Other; miranda, ms (Author) Other; esteves da silva, jcge (Author) FCUP

Journal

Title: Water Research

Vol. 65

Pages: 32-39

ISSN: 0043-1354

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 5 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-009-R2Y

DOI: 10.1016/j.watres.2014.07.018

Abstract (EN): Disinfection of swimming pool water is essential to inactivate pathogenic microorganisms. However chlorine based disinfectants, the most commonly used, are known to lead to the formation of disinfection by-products (DBPs), some of which have been associated with adverse health effects. Precursors of DBPs include the organic matter present in the water used to fill the swimming pool, human body fluids and personal care products (PCPs) used by swimmers and bathers. The increased use, in the last years, of PCPs lead to an increased concern about the fate of PCPs in swimming pool waters and potential health risks of formed DBPs. In this study, the chemical transformations of two salicylates, benzyl salicylate (BzS) and phenyl salicylate (PS), incorporated in several PCPs, in chlorinated water were investigated. High-performance liquid chromatography (HPLC) with UV-diode-array detection (HPLC-UV-DAD) was used to follow the reaction kinetics and HPLC with mass spectrometry (HPLC-MS) was used to tentatively identify the major transformation by-products. Under the experimental conditions used in this work both salicylates reacted with chlorine following pseudo-first order kinetics: rate constant k = (0.0038 +/- 0.0002) min(-1) and half-life t(1/2) = (182 +/- 10) min for BzS and rate constant k = (0.0088 +/- 0.0005) min(-1) and half-life t(1/2) = (79 +/- 4) min for PS (mean +/- standard deviation). The reactions of the two salicylates in chlorinated water led to the formation of DBPs that were tentatively identified as mono- and dichloro- substituted compounds. Most probably they result from an electrophilic substitution of one or two hydrogen atoms in the phenolic ring of both salicylates by one or two chlorine atoms.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8