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DatoValore
TitleBiodegradation of UV-filters in marine sediments
AbstractThe degradation of two of the most frequently used UV-filters was investigated through microcosm studies. Marine sediments 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 solution of 3-(4-methylbenzylidene)camphor (4-MBC) and 2-ethylhexyl 4-(dimethylamino)benzoate (EH-DPAB), at concentrations of either 25 or 50 mg kg-1 each. Methanol (6.3 g/L) also served as an organic amendment and growth substrate for improving microbial activity.Monitoring of the biotic and abiotic degradation of the selected contaminants over 16 months revealed that 4-MBC biodegradationwas very slow and incomplete,whereas over 90% of EH-DPAB was degraded both in the aerobic and the anaerobic reactors by the natural microbial communities of both sediments. Repeated spikes of EH-DPAB were followed by complete decay, characterised by firstorder kinetics. The calculated kinetic rate constants under aerobic and anaerobic conditions were similar. In reactors inoculated 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 duration of the experiment. Mass spectrometry analysis of sediment extracts allowed detection of potential transformation products of EH-DPAB and 4-MBC. Moreover, the natural microbial community of the sediments was studied using the CAtalyzed Reporter Deposition Fluorescence In Situ Hybridization (CARD-FISH) both in the initial sediments and after degradation under aerobic and anaerobic conditions.
SourceScience of the total environment 575, pp. 448–457
KeywordsUV-filtersmarine sedimentsbiodegradationmicrocosmsCARD-FISH
JournalScience of the total environment
EditorElsevier, Lausanne ;, Paesi Bassi
Year2017
TypeArticolo in rivista
DOI10.1016/j.scitotenv.2016.10.001
AuthorsVolpe A., Pagano M., Mascolo G., Grenni P., Rossetti S.
Text359781 2017 10.1016/j.scitotenv.2016.10.001 ISI Web of Science WOS WOS 000390373400046 Scopus 2 s2.0 84992061012 UV filters marine sediments biodegradation microcosms CARD FISH Biodegradation of UV filters in marine sediments Volpe A., Pagano M., Mascolo G., Grenni P., Rossetti S. CNR IRSA The degradation of two of the most frequently used UV filters was investigated through microcosm studies. Marine sediments 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 solution of 3 4 methylbenzylidene camphor 4 MBC and 2 ethylhexyl 4 dimethylamino benzoate EH DPAB , at concentrations of either 25 or 50 mg kg 1 each. Methanol 6.3 g/L also served as an organic amendment and growth substrate for improving microbial activity.Monitoring of the biotic and abiotic degradation of the selected contaminants over 16 months revealed that 4 MBC biodegradationwas very slow and incomplete,whereas over 90% of EH DPAB was degraded both in the aerobic and the anaerobic reactors by the natural microbial communities of both sediments. Repeated spikes of EH DPAB were followed by complete decay, characterised by firstorder kinetics. The calculated kinetic rate constants under aerobic and anaerobic conditions were similar. In reactors inoculated 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 duration of the experiment. Mass spectrometry analysis of sediment extracts allowed detection of potential transformation products of EH DPAB and 4 MBC. Moreover, the natural microbial community of the sediments was studied using the CAtalyzed Reporter Deposition Fluorescence In Situ Hybridization CARD FISH both in the initial sediments and after degradation under aerobic and anaerobic conditions. 575 Published version http //www.sciencedirect.com/science/article/pii/S0048969716321660 01/10/2016 STOTEN 2017, 575, 448 457 published version STOTEN 2017, 575, 448 457.pdf Supplementary material STOTEN 2017 Supplementary Information.docx Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. simona.rossetti ROSSETTI SIMONA angela.volpe VOLPE ANGELA paola.grenni GRENNI PAOLA michele.pagano PAGANO MICHELE giuseppe.mascolo MASCOLO GIUSEPPE TA.P07.017.002 Processi Aerobici e di Dealogenazione Riduttiva per la rimozione dei contaminanti dalle acque