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Adsorption of Sulfated Polysaccharides on Mercury and y-Al203 Particles in Sodium Chloride Solution and Seawater

Marta Plavšić ; Ruđer Bošković Institute, Center For Marine Research, P.O.B. 1016, 10001 Zagreb, Croatia
Božena Čosović ; Ruđer Bošković Institute, Center For Marine Research, P.O.B. 1016, 10001 Zagreb, Croatia
Jasminka Škudar ; Ruđer Bošković Institute, Center For Marine Research, P.O.B. 1016, 10001 Zagreb, Croatia

Sažetak

Adsorption of Dextran sulfate and natural sulfated polysaccharides from algal sources, i-, K- and A-carrageenans on the mercury stir- face and on the y-Al^a particles were studied by out of phase a.c. voltammetry. On the mercury surface, the adsorption of Dextran sulfate and adsorption of carrageenans are of similar extent. Comparative studies of the adsorption of polysaccharides on aluminium particles showed a considerable adsorption of t-carra- geenan and Dextran-sulfate onto X-AI2O3 particles (r = 300 mg/g and 100 mg/g, respectively). Adsorption studies were conducted at pH = 4 in 0.55 M NaCl and in natural seawater (pH = 7.9). Adsorption of (-carrageenans at the mercury/NaCl solution interface is stronger at the potential of -0.2 V than at -0.6 V vs. Ag/AgCl reference electrode. In seawater, the difference between adsorption of (-carrageenan at two potentials is diminished for concentrations of polysaccharide lower than 10 mg/L, where the concentrations of calcium and magnesium ions present are high enough for neutralization of sulfate groups.
The results support the idea, that in seawater, adsorption on particles may play an important role in the transformation, removal and transport of polysaccharides to the sea bottom.

Ključne riječi

Hrčak ID:

135608

URI

https://hrcak.srce.hr/135608

Datum izdavanja:

3.4.1997.

Posjeta: 658 *