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Fecal sterols (coprostanol and epicoprostanol) and linear alkylbenzenes (LABs) are e cient geochemical markers of sewage input in marine environment because they present stability and resistance to degradation processes. e Antarctic region is considered one of the best preserved environments in the world, however the discharge of sewage directly into the marine environments around scienti c stations has resulted in changes in this pristine site. In order to assess the distribution and concentration of sewage indicators from Comandante Ferraz Brazilian Antarctic Station, sediments were sampled during the 2009/10 austral summer at four points: (1) Refuge II (Mackelar Inlet), (2) Ferraz, (3) Ulmann and (4) Botany Point (Martel Inlet) at depths around of 20 until 30 m. e organic markers were determined by gas chromatography with ame ionization (GC-FID) and mass spectrometer detectors (GC-MS). Concentrations of fecal sterols and LABs ranged from <0.01 to 0.17 μg g−1 and <1.0 to 46.5 ng g−1 dry weight, respectively. In general, the higher concentrations were found only locally in the vicinity of Ferraz Station at Martel Inlet. e maximum concentration to fecal sterols was close to the value previously calculated as background level for Martel Inlet (0.19 μg g−1) and it was lower than the concentration found in the same points during the austral summer of 2003/04 (0.93 μg g−1) while for the LABs, the concentration remained practically constant (35 ng g–1). Despite low concentrations of sewage organic markers, monitoring programs are required to determine continuing trends and prevent the increase of anthropogenic impacts.

Fecal Sterols and Linear Alkylbenzenes in Surface Sediments Collected at 2009/10 Austral Summer in Admiralty Bay, Antarctica