太湖河网不同粒级有机物的三维荧光特征解析

Three-Dimensional Fluorescence Analysis of Different Size Fractions of Organic Matter in Taihu River Network

摘要: 利用三维荧光光谱(EEMs)结合平行因子分析法(PARAFAC)，分析了太湖河网夏季的真溶液态及胶体态的可溶性有机物(DOM)含量及组分变化。结果表明：PARAFAC识别出3类荧光组分，分别是C1 (Ex = 255 nm，Em = 451 nm，类腐殖质组分)，C2 (Ex = 240 nm，Em = 392 nm，类腐殖质组分)，C3 (Ex = 230 (275) nm，Em = 337 nm，类蛋白质物质)。其中主要的可溶性有机物为C1组分，胶体态中，类腐殖质C1组分的相对贡献率在32.1%~49.2%之间，均值为39.1%。真溶液态中，类腐殖质C1组分的相对贡献率在38.0%~55.5%之间，均值为48.6%；其中C1、C2组分表现出外源、陆源双重特性，C3属于生物降解的类蛋白质物质。

Abstract: Three-dimensional fluorescence spectroscopy (EEMs) combined with parallel factor analysis (PARAFAC) was used to analyze the soluble organic matter (DOM) content and composition changes in the true solution and colloidal states of the Taihu River Network in summer. The results showed that PARAFAC identified three types of fluorescent components, C1 (Ex = 255 nm, Em = 451 nm, humus-like component), C2 (Ex = 240 nm, Em = 392 nm, humus-like component), C3 (Ex = 230 (275) nm, Em = 337 nm, protein-like substance). The main soluble organic matter was the C1 component. In the colloidal state, the relative contribution rate of humus like C1 component is 32.1%~49.2%, with an average of 39.1%. In the true solution state, the relative contribution rate of humus like C1 component is between 38.0% and 55.5%, with an average of 48.6%. Among them, the C1 and C2 components showed the dual characteristics of exogenous and terrestrial, and C3 was a biodegradable protein-like substance.