Abstract

The degradation of two of the most frequently used UV-filters was investigated through microcosm studies. Marinesediments sampled fromtwo sites in Italy (La Spezia harbour and Sarno river estuary, S1 and S2 respectively)were used to set up aerobic and anaerobic sets of reactors. The sediments were spiked with a methanol solutionof 3-(4-methylbenzylidene)camphor (4-MBC) and 2-ethylhexyl 4-(dimethylamino)benzoate (EH-DPAB), atconcentrations of either 25 or 50 mg kg-1 each. Methanol (6.3 g/L) also served as an organic amendment andgrowth substrate for improving microbial activity.Monitoring of the biotic and abiotic degradation of the selectedcontaminants over 16 months revealed that 4-MBC biodegradationwas very slow and incomplete,whereas over90% of EH-DPAB was degraded both in the aerobic and the anaerobic reactors by the natural microbial communitiesof both sediments. Repeated spikes of EH-DPAB were followed by complete decay, characterised by firstorderkinetics. The calculated kinetic rate constants under aerobic and anaerobic conditions were similar. In reactorsinoculated with the S1 sediment the degradation rate constants progressively increased after each spike,up to the value of 0.039 d-1. For the S2 sediment the rate constant was around 0.020 d-1 throughout the durationof the experiment. Mass spectrometry analysis of sediment extracts allowed detection of potential transformationproducts of EH-DPAB and 4-MBC. Moreover, the natural microbial community of the sediments wasstudied using the CAtalyzed Reporter Deposition Fluorescence In Situ Hybridization (CARD-FISH) both in the initialsediments and after degradation under aerobic and anaerobic conditions.

Autore Pugliese

• Volpe Angela , Mascolo Giuseppe

Tutti gli autori

• Volpe A.; Pagano M.; Mascolo G.; Grenni P.; Rossetti S.

Titolo volume/Rivista

Science of the total environment

Anno di pubblicazione

2017

ISSN

0048-9697

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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Codici ASJC

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