Naslov
The application of ac polarography to the determination of surface active substances in seawater

Autori
Ćosović, Božena ; Vojvodić, Vjeročka

Izvornik
Limnology and Oceanography (0024-3590) 27 (1982), 2; 361-369

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

Ključne riječi
ac polarography; surface active substances

Sažetak
An electrochemical method based on the measurement of the capacity current at the hanging mercury drop electrode by alternating-current polarography was developed and applied to the analysis of surface-active substances in seawater and in sea-surface microlayer samples. Surfactant activities of natural samples collected in the Adriatic Sea in 1978-1980 are compared with different model surfactants (Triton X-100, albumin, fatty acid, humic acid, polysaccharide) and with parallel measurements by the polarographic maximum method. The shape of the capacity current-potential curves of natural samples indicates that the adsorption effect at the electrode is produced redominantly by high molecular weight compounds. The surfactant activity corresponds to about 0.01-0.5 mg• liter-1 for bulk seawater and 0.1-2 mg• liter-1 for sea-surface microlayer samples, relative to Triton-X-100. Seasonal variations in surfactant acitivity values at offshore stations were related to biological activity.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

POVEZANOST RADA