Naslov
Physicochemical Signatures of Natural Sea Films from Middle Adriatic Stations

Autori
Frka, Sanja ; Pogorzelski, Stanislaw ; Kozarac, Zlatica ; Ćosović, Božena

Izvornik
The journal of physical chemistry. B (1520-6106) 116 (2012), S.I.; 6552-6559

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
surface active substances; sea surface microlayer; isotherms; surface rheology; organic matter; Adriatic Sea
(surface active substances; sea surface microlayer; isotherms; surface rheology; organic matter; Adriatic Sea.)

Sažetak
Monolayer studies and force-area quantification approach, in combination with electrochemical methods, are applied for physicochemical characterization of surface active substances (SAS) of the sea surface microlayers (MLs) from Middle Adriatic stations. Higher primary production during late spring-early autumn was reflected in the presence of MLs of higher surfactant activity containing on average molecules of lower molecular masses (Mw=0.65±0.27 kDa) and higher miscibility (y=6.46±1.33) and elasticity (Eisoth=18.33±2.02 mN m-1) modulus in comparison to structural parameters (average Mw=2.15±1.58 kDa ; y=3.51±1.46 ; Eisoth=6.41±1.97 mN m-1) obtained for MLs from period of lower production. Higher inhibition effect on the reduction process of Cd2+ was observed for SAS abundant MLs from more productive period. This kind of distribution is explained as the consequence of competitive adsorption of hydrophobic lipid-like substances of lower Mw that act as end-members, highly influencing the surface structural properties of natural air-water interface forming there segregated surface films during more productive period.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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