Abstract
The photoalteration of algal DOMs produced from different growth phase of blue-green alga, Microcystis aeruginosa, was investigated by comparing the biodegradability and DOM-fraction distributions of algal DOMs under different UV treatments. All algal DOMs were transformed into recalcitrant after UV exposures, without a complete photodegradation. The decreased biodegradability after UV exposures was distinct in algal DOM from aged culture (stationary phases) as compared to the DOM from exponential growth phase. The DOM distributions were also significantly different between before and after UV exposure, implying the photoalteration in chemical composition of algal DOM.
