Journal
WATER
Volume 13, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/w13172390
Keywords
substance release; construction products; biocides; transformation; UV radiation; water contact
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Stormwater from urban areas can transport biocidally active substances and related transformation products from buildings into the environment. The distribution of these substances and transformation products in eluates and coatings differs with exposure conditions. Monitoring data need to consider relevant transformation products for environmental monitoring of biocide emissions.
Stormwater from urban areas can transport biocidally active substances and related transformation products from buildings into the environment. The occurrence of these substances in urban runoff depends on the availability of water, and on ultraviolet radiation exposure that causes photolytic reactions. In a systematic laboratory study, painted test specimens were exposed to either ultraviolet radiation, water contact, or a combination of both. Leaching of the biocidally active substances carbendazim, diuron, octylisothiazolinone, terbutryn, and selected transformation products of terbutryn and diuron were observed under various exposure conditions. Remaining concentrations of these substances in the paint were quantified. It was demonstrated that the distribution of active substances and transformation products in eluates and in the coatings themselves differs with exposure conditions. Strategies for environmental monitoring of biocide emissions need to consider the most relevant transformation products. However, environmental concentrations of biocidally active substances and transformation products depend on earlier exposure conditions. As a consequence, monitoring data cannot describe emission processes and predict expected leaching of biocidally active substances from buildings if the data are collected only occasionally.
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