Benzotriazoles such as 1,2,3-Benzotriazole are petrochemical-derived ingredients which have many functions due to their versatility. In dishwasher detergents, these compounds are often added to prevent corrosion or rust which occurs from the addition of oxygen-based bleaches in the moist environmenti. 1,2,3-Benzotriazole can cause eye irritation, is harmful if swallowedii and has been classified by the Dutch Expert Committee on Occupational Standards as a suspected human carcinogeniii. Benzotriazoles have low biodegradabilityii and are shown to be toxic to aquatic organismsii, a cause for concern considering they are often not removed during wastewater treatment .
i) Walter Giger, Christian Schaffner and Hans-Peter E. Kohler. 2006. Benzotriazole and Tolyltriazole as Aquatic Contaminants. 1. Input and Occurrence in Rivers and Lakes. Environ. Sci. Technol., 2006, 40 (23), pp 7186-7192.
http://pubs.acs.org/doi/abs/10.1021/es061565j doi: 10.1021/es061565j
ii) Lanxess. 2008. Benzotriazole MSDS
iii) Health Council of the Netherlands. 2000. 1,2,3-Benzotriazole. Health-based recommended occupational exposure limit. The Hague: Health Council of the Netherlands, 2000; publication no.2000/14OSH