AI Article Synopsis
- The study examines the biodegradation of dissolved organic matter (DOM) from three algal species: Microcystis aeruginosa, Staurastrum dorsidentiferum, and Cryptomonas ovata.
- The algal DOM from Microcystis and Staurastrum is generally more stable, whereas some of the DOM from Cryptomonas is likely to decompose more easily.
- Four distinct fluorescence peaks were identified in the algal DOM, with specific characteristics indicating that fulvic-like substances are likely resistant to degradation across all species, although the protein-like substances show varying stability depending on the algal source.
Article Abstract
The biodegradation study of algal dissolved organic matter (DOM) released from Microcystis aeruginosa, Staurastrum dorsidentiferum and Cryptomonas ovata was carried out. The algal DOM released from Microcystis aeruginosa and Staurastrum dorsidentiferum is relatively stable, while a part of the algal DOM released from Cryptomonas ovata may be easily decomposed. Before biodegradation, two fulvic-like fluorescence peaks (A and B) and a protein-like fluorescence peak (C) and another peak with E(x)/E(m) values of 320 - 330/390 nm (peak D) were observed in the algal DOM released from three kinds of phytoplankton. The fulvic-like fluorophores may be refractory regardless of the kinds of phytoplankton, while protein-like fluorophores released from Microcystis aeruginosa and Staurastrum dorsidentiferum may be relatively refractory and those from Cryptomonas ovata may be unstable. Peak D in the surface water of Lake Biwa may be attributed to low-molecular-weight substances produced during cultivation and/or biodegradation of several kinds of phytoplankton. The ratios of the fluorescence intensities (RFI/DOC) of peak A to peak B in algal DOM (< 1.0) were lower than those in soil Dando FA (1.8). On the other hand, no relationships between peak A and peak C were observed for three kinds of phytoplankton.
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| http://dx.doi.org/10.2116/analsci.28.675 | DOI Listing |
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