Data for: Identification of avobenzone by-products formed by various disinfectants in different swimming pool waters

Published: 28-02-2020| Version 1 | DOI: 10.17632/sfmt35czbb.1
Contributors:
Polonca Trebše,
Mojca Bavcon Kralj,
Olga Polyakova,
Sergey A. Pokryshkin,
Elena A. Detenchuk,
Albert Lebedev

Description

The manuscript deals with the transformation of avobenzone, a widespread UV filter, under disinfection conditions. In its pure form avobenzone is known to undergo several transformations including photo-isomerisation, photodegradation, and halogenation. Over 60 disinfection by-products were identified as transformation products of avobenzone in different disinfecting reactions of chlorination and bromination in fresh and sea water. Two occasional samples of swimming pool water demonstrated the presence of some of these by-products in rather high levels. Although the toxicity of the majority of these products remain unknown substituted chlorinated phenols and acetophenones are known to be rather toxic. Aquatic bromination of avobenzone resulted in the identification of 33 DBPs. Many of them contain bromine in the molecular structure. Addition of copper salt slightly decreases conversion rate simultaneously increasing the levels of major brominated products. Special attention requires 65-fold increase of the toxic bromoform level. After 24 hours of bromination bromoform becomes the major product of the reaction. Degradation of 3 commercial sunscreen products (solar protection factor 30) containing avobenzone under different experimental conditions including UVA/UVB, UVC photostimulation and chlorination was studied. The commercial sunscreen products have completely different enhancing and inhibitory effect on avobenzone degradation under UVC light. The complex composition of commercial products caused also a protective shield in case of chlorinated solutions of commercial formulations exposed to chlorine and UVA/UVB light at the same time.

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