三维荧光与平行因子研究黑臭河流DOM

Analyzing DOM in black and odorous water bodies using excitation-emission matrix fluorescence with PARAFAC

利用三维荧光光谱(EEMs)与平行因子(PARAFAC)模型相结合,分析了沈阳市5条典型黑臭水体溶解性有机物(DOM)的荧光组分特征,并结合常规水质指标,利用主成分分析法(PCA)对影响黑臭水体DOM的主要因素及其贡献量进行了研究.结果表明,沈阳市典型黑臭水体DOM主要由类蛋白荧光组分C1(235,360),类富里酸荧光组分C2(220,430)和类腐殖酸荧光组分C3(255,520)组成.C2类富里酸物质与COD_(Cr)、氨氮、S^(2-)、TP有很强的正相关性,与DO和透明度成负相关,来自于陆源;C1类色氨酸和C3类腐殖酸表现出明显的正相关,具有同源性,来自于微生物內源.陆源有机质组分对黑臭水体DOM的贡献率高达61.2%,微生物内源组分对黑臭水体DOM的贡献率为25.5%.5个黑臭水体在水质上存在差异,支流Ⅰ和支流Ⅱ为重度黑臭,支流Ⅲ、Ⅳ和Ⅴ为轻度黑臭.

Excitation-emission matrix （EEM） fluorescence spectroscopy combined with parallel factor analysis （PARAFAC） and multivariable analysis were employed to analysis the components and source of dissolved organic matter （DOM） and to reveal their correlations with water quality in five black and odorous water bodies in Shenyang. DOM was decomposed into three components by PARAFAC, including protein-like component C1（235,360）, fulvic-like component C2（220,430） and humic-like component C3（255,520）. Based on principal component analysis, C2 exhibited close positive correlations with CODCr, NH4＋-N, S2- and TP, and good negative correlations with DO and transparency. C2 mainly derived from terrestrial organic matter. C2had a better positive correlation with C3, indirectly proving that C2 and C3 could originate microbial endogenous. The results indicated that the contribution rate of terrestrial organic matter and microbial endogenous to the DOM of black and odorous water bodies was as high as 61.2% and 25.5%, respectively. There were significant differences about the five black and odorous water bodies in water quality, tributary I and II were serious black-odorous , whereas tributary III, IV and V were mild black-odorous.