Semi-volatile organic compounds (SVOCs) are widely distributed across the globe, including polar regions. This study investigates the distribution and bioconcentration of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) in soils and Colobanthus quitensis, while also estimating potential emission sources. Results indicated high concentrations of PAHs in soils and plants from the Sub-Antarctic region, while OCPs and PCBs were more prevalent in the Antarctic region, with higher contaminant concentrations found in soils than in plant tissues. Hexachlorobenzene (HCB) and dichlorodiphenyldichloroethylene (p,p'-DDE) were significantly higher in the Antarctic region, suggesting historical dichlorodiphenyltrichloroethane (DDT) use, while PCB 153 and 180 were the most representative PCBs in the Antarctic region. Phenanthrene (Phe) was the dominant PAH in both regions. The bioconcentration factor analysis from soils (BCFSoils) revealed potential anthropogenic influences for certain contaminants, including γ-hexachlorocyclohexane (γ-HCH) and PCB 9 in the Sub-Antarctic region, and HCB, p,p'-DDE, PCB 9, and benzo-naphtho-thiophene in the Antarctic region. However, compounds with higher hydrophobicity showed lower Bioconcentration factor (BCFSoils) values, indicating a tendency to accumulate in soil rather than plant tissues. This was consistent with the inverse relationship found between BCFSoils and the octanol-water partition coefficient (Log KOW). Diagnostic ratios of PAHs revealed a predominantly pyrogenic source in the Sub-Antarctic region, while a mixture of sources was observed in the Antarctic region.

Centro de Ecología Integrativa Universidad Católica del Maule Talca Chile

Centro de Ecología Integrativa Universidad de Talca Campus Lircay Talca Chile

Centro de Ecología Integrativa Universidad de Talca Campus Lircay Talca Chile; Departamento de Microbiología Facultad de Ciencias de la Salud Universidad de Talca Campus Lircay Talca Chile

Centro de Genómica Ecología y Medio Ambiente Universidad Mayor Campus Huechuraba Santiago Chile

Centro de Genómica Ecología y Medio Ambiente Universidad Mayor Campus Huechuraba Santiago Chile; Facultad Ciencias de La Vida Universidad Andrés Bello Santiago 8370251 Chile

Centro de Genómica Ecología y Medio Ambiente Universidad Mayor Campus Huechuraba Santiago Chile; Institute of Environment Florida International University University Park Miami FL 33199 USA; Data Observatory Foundation Santiago Chile

Facultad de Ingeniería y Tecnología Universidad San Sebastián Lientur 1457 Concepción Chile; RECETOX Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

RECETOX Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

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