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DatoValore
TitleBioaccumulation of perfluorinated alkyl acids in two benthic invertebrates: Lumbriculus variegatus and Chironomus riparius
AbstractThe aim of this work was to study the bioaccumulation of 3 perfluorinated alkyl acids (PFBS, PFOS and PFOA) in two benthic invertebrates: Lumbriculus variegatus and Chironomus riparius. Specimens of Lumbriculus variegatus and larvae of Chironomus riparius were exposed to microcosms with formulated sediment and water at nominal concentration of 10 ?g/L. The distribution of the perfluorinated acids in the different compartments (overlaying water, sediment and organisms) at the end of the tests have been measured. Most of the added PFOA and PFBS were measured in the overlaying water (65%) whereas PFOS was mainly detected in the sediment (36 % of the added amount). No loss of PFOA was detected for evaporation while PFBS and PFOS were partially air stripped (25% and 45 % respectively) because of the aeration of the microcosms. Accumulation was higher in L. variegatus than in C. riparius for all the 3 perfluorinated alkyl acids. Accumulation in C. riparius were mainly due to uptake by aqueous phase: the bioaccumulation factors (BAF) based on water concentrations were 0.2, 3 and 19 ?g kg-1 ww/?g L-1 for PFBS, PFOA and PFOS respectively. On the contrary sediment ingestion was the main uptake route for L. variegatus: bioaccumulation is also dependent on the organic carbon content of the sediment that affects feeding rate of L. variegatus. The BAF based on sediment concentrations were 32, 55 and 47 ?g kg-1ww/?g kg-1dw for PFBS, PFOA and PFOS respectively. PFBS is potentially less bioaccumulable than its homologues with longer carbon chain because of its shorter carbon chain and its higher solubility. Nevertheless our results showed that, in sediment-dwelling organisms, bioaccumulation of PFBS can be of the same order of magnitude of that measured for PFOS. This result raises new questions about the environmental risk of this compound.
Source24th Annual Meeting of SETAC Europe "Science across bridges, borders and boundaries", Basel, Switzerland, 11-15 May 2014
KeywordsPFASbioaccumulationsedimentLumbriculus variegatusChironomus riparius
Year2014
TypePoster
AuthorsSara Valsecchi, Laura Marziali, Michela Mazzoni, Stefano Polesello, Marianna Rusconi, Fabrizio Stefani
Text347752 2014 PFAS bioaccumulation sediment Lumbriculus variegatus Chironomus riparius Bioaccumulation of perfluorinated alkyl acids in two benthic invertebrates Lumbriculus variegatus and Chironomus riparius Sara Valsecchi, Laura Marziali, Michela Mazzoni, Stefano Polesello, Marianna Rusconi, Fabrizio Stefani C.N.R. Water Research Institute, Via del Mulino, 19 20047 Brugherio , Milano, Italy The aim of this work was to study the bioaccumulation of 3 perfluorinated alkyl acids PFBS, PFOS and PFOA in two benthic invertebrates Lumbriculus variegatus and Chironomus riparius. Specimens of Lumbriculus variegatus and larvae of Chironomus riparius were exposed to microcosms with formulated sediment and water at nominal concentration of 10 g/L. The distribution of the perfluorinated acids in the different compartments overlaying water, sediment and organisms at the end of the tests have been measured. Most of the added PFOA and PFBS were measured in the overlaying water 65% whereas PFOS was mainly detected in the sediment 36 % of the added amount . No loss of PFOA was detected for evaporation while PFBS and PFOS were partially air stripped 25% and 45 % respectively because of the aeration of the microcosms. Accumulation was higher in L. variegatus than in C. riparius for all the 3 perfluorinated alkyl acids. Accumulation in C. riparius were mainly due to uptake by aqueous phase the bioaccumulation factors BAF based on water concentrations were 0.2, 3 and 19 g kg 1 ww/ g L 1 for PFBS, PFOA and PFOS respectively. On the contrary sediment ingestion was the main uptake route for L. variegatus bioaccumulation is also dependent on the organic carbon content of the sediment that affects feeding rate of L. variegatus. The BAF based on sediment concentrations were 32, 55 and 47 g kg 1ww/ g kg 1dw for PFBS, PFOA and PFOS respectively. PFBS is potentially less bioaccumulable than its homologues with longer carbon chain because of its shorter carbon chain and its higher solubility. Nevertheless our results showed that, in sediment dwelling organisms, bioaccumulation of PFBS can be of the same order of magnitude of that measured for PFOS. This result raises new questions about the environmental risk of this compound. Published version 24th Annual Meeting of SETAC Europe Science across bridges, borders and boundaries Basel, Switzerland 11 15 May 2014 Internazionale Contributo abstract poster WE171abstracts_presentation_21625.pdf Poster mariannarusconi RUSCONI MARIANNA MAZZONI MICHELA stefano.polesello POLESELLO STEFANO laura.marziali MARZIALI LAURA fabrizio.stefani STEFANI FABRIZIO saramaria.valsecchi VALSECCHI SARA MARIA