Naslov
Trace elements and dissolved organic matter in estuarine surface microlayer - Case study in the Krka River estuary

Autori
Marcinek Saša ; Cindrić Ana Marija ; Omanović Dario

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XVI International Estuarine Biogeochemistry Symposium : Book of Abstracts / Omanović, Dario ; Cobelo-García, Antonio ; Schäfer, Jörg - Zagreb : Institut Ruđer Bošković, 2023, 34-34

ISBN
978-953-7941-47-5

Skup
XVI International Estuarine Biogeochemistry Symposium (IEBS)

Mjesto i datum
Šibenik, Hrvatska, 23.05.2023. - 26.05.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
trace metals ; dissolved organic matter ; metal speciation, stratified estuary ; Krka River estuary ; surface microlayer

Sažetak
Dynamics of various trace elements and dissolved organic matter, including the ambient Cu speciation, was studied at the sea-atmosphere phase boundary in the Krka River estuary. The study was performed in order to determine the levels of total and dissolved concentrations of various trace elements, to evaluate their diel variability in the surface microlayer (SML) and their enrichment with respect to underlaying water. The influence of wind speed and direction, bubble scavenging, as well the organic matter quantity and composition were examined. The intensive SML samplings (every 2 hours during 16- hour period) in two sampling campaigns (July and September 2020) provided several insights into the factors influencing trace element dynamics at the microlayer. Pronounced diel variability of trace elements and the dissolved organic carbon was observed within the SML, highlighting the flaws of discrete sampling and emphasizing the importance of carefully designed sampling campaigns. A strong influence of suspended particulate matter on the accumulation and variability of trace metals in SML was observed, primarily on Fe, Al, Mn and Pb. The results indicated that the enrichment of dissolved Fe, Cu, Pb, Mn, Zn and Al in the estuarine SML is driven by complexation with organic ligands, primarily Fe, Cu and Pb. These metals also showed the highest enrichment as a result of bubble scavenging. Analysis of Cu- binding ligands in SML showed higher enrichment of strong L1 ligands (average logK’CuL1 = 13.2), although Cu speciation in the SML was controlled by the abundance of weaker L2 ligands (average logK’CuL2 = 11.1). Finally, a day-night variations in trace element enrichment and organic matter concentration and composition in the SML indicated the importance of bacterioneuston activity in the cycling of organic matter and associated trace metals in the SML.

Izvorni jezik
Engleski

Znanstvena područja
Interdisciplinarne prirodne znanosti

POVEZANOST RADA