Abstract:Formation rules of dissolved organic nitrogen (DON), as well as characteristics of extracellular oganic matter (EOM) & intracellular organic matter (IOM) during the growth of Microcystis aeruginous have been studied. The results show as follows: DON concentration of EOM shows a growing tendency during the growth of Microcystis aeruginous, the yield of which is less than 0.05mg DON per 107cells in the early growth phase, around 0.40mg DON per 107cells in the late growth phase, respectively; molecular weight distributions of EOM during exponential phase and decline phase mainly concentrate in range of less than 1kDa and more than 100kDa, while organic matter less than 30kDa dominating EOM in stationary phase;molecular weight distributions of IOM concentrate in range of more than 1kDa and less than 100kDa in the three phases. The main fluorescence regions of EOM occur at the fluorescence region of humic acid-like materials and soluble microbial products. By contrast, the region of aromatic proteins and soluble microbial products dominate the main region of EEM spectra of IOM.
古励, 郭显强, 丁昌龙, 何强, 单志俊. 藻源型溶解性有机氮的产生及不同时期藻类有机物的特性[J]. 中国环境科学, 2015, 35(9): 2745-2753.
GU Li, GUO Xian-Qiang, DING Chang-Long, HE Qiang, DAN Zhi-Jun. Formation of algae-derived DON and characterization of algae organic matter (AOM) from different stages. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2745-2753.