Cell suspension as a model system for electrochemical analysis

Kovač, Solveg; Kraus, Romina; Geček, Sunčana; Žutić, Vera (2000) Cell suspension as a model system for electrochemical analysis. Croatica Chemica Acta, 73 (1). pp. 279-291. ISSN 0011-1643

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Abstract

Cell suspensions of marine phytoplankton Dunaliella tertiolecta in 0.1 M NaCl solution are proposed as a suitable model monodispersed system (particle diameter 6-10 mu m) for the calibration of electrochemical response in natural aquatic samples containing organic surface-active particles. The electrochemical analysis is performed by direct recording of chronoamperometric curves of oxygen reduction in suspensions using a fast dropping mercury electrode. The electrode acts as adhesion sensor. The adhesion of individual surface-active particles suspended in natural seawater, analogously to Dunaliella tertiolecta cells in model suspensions, results in well resolved attachment signals in amperometric curves. The calibration curve presents dependence of attachment frequency on cell densities in the concentration range 10(6) to 2.5 x 10(7) particles L-1 and it can be used for the determination of particle abundance in a seawater sample. The advantage of the electrochemical approach over more conventional methodologies for particle analysis is discussed.

Item Type:	Article
Uncontrolled Keywords:	attachment signals; dropping mercury electrode; Dunaliella tertiolecta; organic particle analysis; surface-active particles; natural-waters; organic-matter; sea-water; polarography; interface; colloids; heterocoalescence; electrode
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Center for Marine Research Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Eutrofikacija i procesi na međupovršinama Vera Žutić 00981508 MZOS
Depositing User:	Romina Kraus
Date Deposited:	22 Nov 2013 14:46
URI:	http://fulir.irb.hr/id/eprint/1083

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