The Presence of Nitrates and the Impact of Ultraviolet Radiation as Factors that Determine Nitrate Reductase Activity and Nitrogen Concentrations in Deschampsia antarctica Desv. Around Penguin Rookeries on King George Island,Maritime Antarctica

This paper addresses the oxidation by ultraviolet radiation of methylparaben, a ubiquitous and suspicious preservative which is massively added to cosmetics and personal care products. Experiments included pH and temperature variation, as well as several experimental conditions such as presence/absence of hydrogen peroxide, titanium dioxide, or some different water matrix (surface water or ground water). Results were evaluated under the line source spherical emission model, so quantum yield was the adequate target variable for explaining the process. A modified Arrhenius correlation including pH level was used for modelling the whole system.