Predicting bioaccessibility of contaminants of emerging concern in marine sediments using chemical methods

Autor(es)

dos Santos, Dayana M. ^{[1, 2]} ; Williams, Mike ^[3] ; Kookana, Rai ^[3] ; de Marchi, Mary Rosa R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Inst Chem, Sao Paulo - Brazil

^[2] State Univ Londrina UEL, Dept Chem, Londrina, Parana - Brazil

^[3] CSIRO Land & Water, Urrbrae, SA - Australia

• Tipo de documento: Artigo Científico
• Fonte: Journal of Soils and Sediments; v. 18, n. 4, p. 1720-1728, APR 2018.
• Citações Web of Science: 0

Resumo

A comparison was made between three chemical methods to predict bioaccessibility of triclosan (TCS), bisphenol A (BPA), and 17 alpha-ethynylestradiol (EE2) in marine sediments, involving an exchangeable (E) value, butanol extractions, and hydroxypropyl-beta-cyclodextrin (beta-HPCD) extractions. A 60-day batch experiment was undertaken where the aqueous phase was analyzed by GC-MS/MS. The bioaccessibility study based on the E value model involved monitoring stable isotopes exchanging with the bioaccessible phase, while this exchangeability was also estimated with sediment extractions with butanol and beta-HPCD, respectively. Based on the E value method, TCS was readily exchangeable for up to 7 days, while after this period become virtually non-exchangeable (not detected in aqueous phase). This trend was also evident for butanol and beta-HPCD extractions, suggesting TCS was strongly complexed with the matrix. For BPA and EE2, the fraction considered exchangeable was higher after 14 days and the extraction efficiency was slightly higher for the butanol treatment. Chemical methods to predict bioaccessibility in marine sediments have demonstrated differences between selected contaminants, but agreement between methods. Triclosan shows the highest affinity with tested sediments, some exchangeability in the first days of interaction of E value experiment as well as observed for extraction methods. However, the highest capacity to be extracted from already-sorbed phase was observed for BPA, showed in both extraction methods, and confirming its mobility and bioaccessibility in sediments over the time. (AU)

• Processo FAPESP: 12/17898-7 - Influência dos emissários submarinos na ocorrência de contaminantes emergentes fenólicos no litoral do estado de são paulo
• Beneficiário: Dayana Moscardi dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/09437-2 - Estudo da biodisponibilidade de microcontaminantes estrogênicos em sedimentos marinhos
• Beneficiário: Dayana Moscardi dos Santos
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado