天津大沽排污河及大沽沙航道水体中CDOM光谱分析

摘要

The spatial distribution,composition,and sources of Chromophoric Dissolved Organic Matter(CDOM)in the water of Dagu Drainage River and Dagusha Channel were analyzed by using UV-Vis absorption spectra and excitation-emission matrix spectra.The results indicated that the CDOM absorption coefficient,a355,ranged from 1.73,m-1to 23.62,m-1. The abundance of CDOM was highest in the downstream of Dagu Drainage River,followed by the upstream of the river,and then the Dagusha Channel,which showed that the organic pollution loads were the largest in the downstream of Dagu Drain-age River.Protein-like peaks(T1,T2)and humic-like peaks(A,C,M) were founded in the studied area,and the protein-like components accounted a larger proportion,while a closer relationship existed between humic-like components and the ab-sorption of CDOM.The results of Emmax of peak A and C and the UV-Vis spectrum parameter,E253/203,suggests that CDOM in the water of the downstream of Dagu Drainage River exhibited a higher aromaticity.Besides,the aromatic rings contained a great deal of hydroxyl,carbonyl carboxyl,and ester groups.The humification index HIXb suggested that the sources of CDOM in the downstream of Dagu Drainage River were mainly terrestrial inputs(industrial sewage),while in the upstream of Dagu Drainage River and Dagusha Channel,CDOM was mainly caused by microbial activities.%应用紫外-可见吸收光谱、三维荧光光谱对大沽排污河及大沽沙航道水体中有色溶解有机物(CDOM)的空间分布、组成、来源进行了分析.结果显示吸收系数a355变化范围为1.73~23.62,m-1,CDOM丰度空间分布为大沽排污河下游最高,上游次之,大沽沙航道最低,表明大沽排污河下游水体有机污染负荷最大.CDOM荧光物质包括类蛋白质(T1、T2)和类腐殖质(A、C、M)两类组分,以类蛋白质组分的百分比最高,但相关性分析表明类腐殖质组分与CDOM的吸收相关性更好.A峰和C峰对应的最大发射波长及紫外-可见吸收光谱参数E253/203结果显示,大沽排污河下游水体CDOM芳香性较高,且芳香环取代基中含有较多的羟基、羰基、羧基、酯基.荧光指数HIXb显示大沽排污河下游水体CDOM来源以陆源输入(工业废水)为主,而排污河上游及航道水体CDOM主要由生物活动产生.