藻源有色溶解有机物的光学特性变化及一氧化碳的光生成——以中肋骨条藻为例

The optical properties of chromophoric dissolved organic matter (CDOM) during the growth of Skeletonema costatum, the degradation of its algae-derived CDOM and the generation of carbon monoxide (CO) under different wavelengths of irradiation were studied. The results showed that during the growth of Skeletonema costatum, the CDOM absorption coefficients (a(350)) first decreased and then increased. Three fluorescent components were identified during the culture, including C1(humic-like substance, E_x/E_m =325nm/395nm), C2(humic-like substance, E_x/E_m =265nm/445nm) and C3(protein-like substance, E_x/E_m =275nm/345nm). With the increase of irradiation wavelength, the loss rates of a(350) and the fluorescence intensities of fluorescent components in different growth phases showed an increasing trend. After 9hours of irradiation at 280~800nm, 315~800nm and 400~800nm wavelengths, the a(350) was averagely reduced by 69.07% ± 8.23%, 51.85% ± 12.54%, 31.12% ± 3.40%, respectively. In addition, the production of CO from the photodegradationof algae-derived CDOM increased with the increase of the irradiation wavelength, and the contribution of ultraviolet light to CO production was more than 70%.