Portal de Periódicos da CAPES

Temporal-spatial survey of PAHs and PCBs in the Atlantic Iberian northwest coastline, and evaluation of their sources and risks for both humans and aquatic organisms

2021; Elsevier BV; Volume: 279; Linguagem: Inglês

10.1016/j.chemosphere.2021.130506

1879-1298

Maria João Rocha, Ana Beatriz Frazão Ribeiro, Diana Campos, Eduardo Rocha,

Mercury impact and mitigation studies

Herein, sixteen priority sixteen priority polycyclic aromatic hydrocarbons (PAHs) and seven polychlorinated biphenyls (PCBs), considered seawater quality indicators, were quantified in four beaches of the Iberian (Portuguese) northwest coastline, including one ornithological reserve. These seashores are close to an important industrial region and a harbour. Water samples were extracted for PAHs and PCBs in their aqueous phase (DAP) and suspended particulate matter (SPM) and analysed by GC-MS/MS. Annual average concentrations reached ∼8 ng/L (DAP) and ∼100 ng/g dw (SPM) for PAHs and ∼3 ng/L (DAP) and ∼19 ng/g dw (SPM) for PCBs. PAHs and PCBs had fluctuations suggestive of seasonality. The possible origins of PAHs point to pyrogenic (forest fires) and petrogenic activities linked to maritime transports. The source(s) of PCBs appear to be related with leaks from waste sorting centres located in the vicinity of the sampling sites, together with the burning of contaminated materials. Toxic equivalents (TEQs) suggested a low carcinogenic potential for PAHs in seawater samples (∼0.3 ng/L and ∼4 ng/g dw, for DAP and SPM). Evaluation of risk coefficients for Σ16 PAHs revealed "Low-risk" of both matrices in all sampling areas. PCBs thyroid toxicity equivalents (TEQs-TH), suggested a low impact on biota (∼7.0E-05 ng/L and ∼5.2E-04 ng/g dw, for DAP and SPM). However, in vivo acute assays with Artemia salina exposed to environmental concentrations of PAHs, PCBs, and mixtures, confirmed the theoretical approach, showing that this coastline is not "Risk-free". This fact calls for further toxicological approaches to fully understand the risks posed by these compounds locally. • 16 priority PAHs and 7 indicators PCBs were measured in North-Iberian seacoast. • Pyrogenic/petrogenic sources were unclosed for PAHs and incineration for PCBs. • Toxic equivalents for PAHs and PCBs point to low risks for humans. • Risk Quotients reveal "Low-risk" for the ecosystems. • Environmental levels of PAHs caused higher mortality of Artemia salina .