Prioritisation of emerging contaminants in the northern Antarctic Peninsula based on their environmental risk.

Although Antarctica is protected and human activity is restricted exclusively to scientific research, with numerous restrictions on tourism, the steadily increasing human presence appears to be having a marked impact on terrestrial and aquatic, especially marine, ecosystems. Evidence of this excessive presence can be seen from the recent detection of contaminants linked to human activity in locations that should be considered to be untouched. The aim of this study is to determine the environmental risk present on the Antarctic Peninsula due to the 54 emerging contaminants linked to human presence previously detected and reported in previous studies published in leading scientific journals. The substances analysed belong to the group of drugs/medicines of abuse, endocrine disruptors, pyrethroids, perfluorinated compounds and sunscreens. The environmental risk was determined for all substances detected by calculating the hazard quotient (HQ) following the guidelines established by the European Union. An HQ value higher than 10 was taken to represent a high environmental risk. In the group of drugs/medicines of abuse, a high risk was detected for two analgesics, namely acetaminophen and diclofenac, and the anti-inflammatory ibuprofen. Although the risk detected was considered to be medium, the presence of the antibiotic clarithromycin, one of the substances included in the EU's current watch list for emerging contaminants, should be noted. In the group of endocrine disruptors, the high risk posed by the metabolite nonylphenol diethoxylate, which is higher than that for its parent compound nonylphenol, should be noted. In the group of pyrethroids/sunscreens/perfluorinated compounds, two pyrethroids, namely bifenthrin and cyhalothrin, were found to pose a high environmental risk. We propose the need to establish a monitoring system for emerging contaminants linked to human presence on the Antarctic Peninsula similar to the watch list found in the EU Water Framework Directive. Subsequently, an environmental monitoring plan based on individual ecotoxicological studies with the substances concerned, and analysing their possible synergic effects, should be implemented.