Physicochemical Signatures of Natural Sea Films from Middle Adriatic Stations

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• 作者：Sanja Frka ; Stanislaw Pogorzelski ; Zlatica Kozarac ; Bo啪ena 膯osovi膰
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：June 28, 2012
• 年：2012
• 卷：116
• 期：25
• 页码：6552-6559
• 全文大小：269K
• 年卷期：v.116,no.25(June 28, 2012)
• ISSN：1520-5215

文摘

Monolayer studies and a force鈥揳rea 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鈥揺arly autumn was reflected in the presence of MLs of higher surfactant activity containing on average molecules of lower molecular masses (M_w = 0.65 卤 0.27 kDa) and higher miscibility (y = 6.46 卤 1.33) and elasticity (E_isoth = 18.33 卤 2.02 mN m^鈥?) modulus in comparison to structural parameters (average M_w = 2.15 卤 1.58 kDa; y = 3.51 卤 1.46; E_isoth = 6.41 卤 1.97 mN m^鈥?) obtained for MLs from a period of lower production. A higher inhibition effect on the reduction process of Cd²⁺ was observed for SAS abundant MLs from a more productive period. This kind of distribution is explained as the consequence of competitive adsorption of hydrophobic lipid-like substances of lower M_w that act as end-members, highly influencing the surface structural properties of the natural air鈥搘ater interface forming there segregated surface films during more productive period.