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Adsorption of Sulfated Polysaccharides on Mercury and gamma-Al2O3 Particles in Sodium Chloride Solution and Seawater

Plavšić, Marta; Ćosović, Božena; Škudar, Jasminka (1997) Adsorption of Sulfated Polysaccharides on Mercury and gamma-Al2O3 Particles in Sodium Chloride Solution and Seawater. Croatica chemica acta, 70 (1). pp. 111-123. ISSN 0011-1643

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Abstract

The adsorption of Dextran sulfate and natural sulfated polysaccharides from algal sources, thau-, kapa- and lhambda- carrageenans on the mercury surface and on the gamma-Al2O3 particles were studied by out of phase a.c. voltammetry. On the mercury surface the adsorption of Dextran sulfate and adsorption of carrageenas are of the similar extent. The comparative studies of the adsorption of polysaccharides on aluminum particles showed a high affinity of thau-carrageenan and Dextran-sulfate for gamma-Al2O3 particles (Gamma=300 mg/g and 95 mg/g, respectively). The adsorption studies was conducted at the pH value of natural waters (pH=4 and pH=7.9) in 0.55 M NaCl and in natural seawater. The adsorption properties of carrageenans are changed in seawater in respect to the adsorption in 0.55 M NaCl due to the partial neutralization of sulfate groups by Ca and Mg ions present in the seawater. This is obvious especially for thau-carrageenan. The results support the features already observed in the formation of the so called marine snow, i.e fast transformation and removal of polysaccharides onto hydrophobic and hydrophilic particles and their transport to the sea bottom.

Item Type: Article
Uncontrolled Keywords: Sulfated Polysaccharides; mercury surface
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Priroda i reaktivnost organskih tvari u moru i kopnenim vodaBožena Ćosović00981503UNSPECIFIED
Depositing User: Sofija Konjević
Date Deposited: 20 Apr 2016 11:33
Last Modified: 20 Apr 2016 11:33
URI: http://fulir.irb.hr/id/eprint/2745

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