Croatica Chemica Acta, Vol. 91 No. 4, 2018.
Original scientific paper
https://doi.org/10.5562/cca3433
Production of Surface Active Organic Material and Reduced Sulfur Species During the Growth of Marine Diatom Cylindrotheca closterium
Irena Ciglenečki
; Laboratory for Physical Oceanography and Chemistry of Aquatic Systems, Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
Jelena Dautović
; Laboratory for Physical Oceanography and Chemistry of Aquatic Systems, Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
Ana Cvitešić
; Laboratory for Physical Oceanography and Chemistry of Aquatic Systems, Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
Galja Pletikapić
; Laboratory for Physical Oceanography and Chemistry of Aquatic Systems, Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
Abstract
Electrochemical methods at the mercury electrode were used for monitoring production of surface active substances (SAS) and reduced sulfur species (RSS) during growth of marine diatom Cylindrotheca closterium isolated from the Adriatic Sea in the laboratory conditions. In the same culture samples, production of particulate and dissolved organic carbon (POC, DOC) was followed by high temperature catalytic oxidation method (HTCO). The culture growth curve obtained by microscopically counted phytoplankton cells showed an exponential growth phase that lasted 10 days, transition phase until 14 days and stationary phase until 21 days. In these time periods twofold increase of SAS and DOC was followed, while POC increased 41 times. Detail analyses of a.c. out of phase voltammetric curves recorded in original and in acidified phytoplankton culture samples indicate transformation of organic material during growth, from more anionic (negatively charged) to less anionic polymeric surface active material. In culture samples presence of non-volatile RSS were confirmed.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Keywords
a. c. voltammetry; surface active substances; phytoplankton exudates; Cylindrotheca closterium; DOC; POC; reduced sulfur species
Hrčak ID:
217781
URI
Publication date:
30.12.2018.
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