山东省平度市农村黑臭水体DOM三维荧光光谱的平行因子分析

Parallel factor analysis with three-dimensional excitation-emission matrix spectroscopy on dissolved organic matter of rural black and odorous water bodies in Pingdu City of Shandong Province

运用三维荧光光谱联合平行因子法及相关性分析,以山东省平度市农村黑臭水体为研究对象,探讨其溶解性有机质(DOM)组成、腐殖化程度及来源。结果表明:该市农村黑臭水体DOM包含5类6个荧光组分,分别为类色氨酸荧光组分(C1和C6)、类腐殖质荧光组分(C2)、浮游生物活动产生荧光组分(C3)、类胡敏酸荧光组分(C4)、类富里酸荧光组分(C5);荧光指数、自生源指数、腐殖化指数和新鲜度指数分别为1.6~1.9、0.8~1.0、0.6~3.0和0.80~0.95的水体占90%,表明该市农村黑臭水体DOM具有外源与内源双重特性,同时具有弱腐殖质特征;结合相关性分析得出,C1、C2、C3、C4之间均呈正相关,其中C2与C4呈极显著正相关(R^(2)=0.98,P<0.01),C5、C6与其他组分之间均不相关,表明该市农村黑臭水体DOM组分来源具有多样性。

Three-dimensional excitation-emission matrix spectroscopy(EEMs)combined with parallel factor analysis(PARAFAC)were used to analyze the components,humification degree and sources of dissolved organic matter(DOM)of rural black and odorous water bodies in Pingdu City of Shandong Province.The results showed that the DOM of rural black and odorous water bodies in the city contained five categories and six fluorescence components,including tryptophan-like fluorescence components(C1 and C6),humus-like fluorescence components(C2),fluorescence components produced by plankton activities(C3),humic acid-like fluorescence components(C4),and fulic-like fluorescence components(C5).The water bodies with fluorescence index,autochthonous index,humification index and freshness index of 1.6-1.9,0.8-1.0,0.6-3.0 and 0.80-0.95,respectively,accounted for 90%of all,indicating that the DOM in rural black and odorous water bodies in the city had the dual characteristics of endogenous and exogenous,and had weak humification characteristics.The correlation analysis showed that the positive correlation was found between C1,C2,C3 and C4,and a significant positive correlation existed between C2 and C4(R^(2)=0.98,P<0.01),and C5 and C6 had no correlation with other components,indicating that the sources of DOM components of rural black and smelly water bodies in the city were diverse.