胶州湾海水溶解有机物三维荧光特征研究

Excitation-Emission-Matrix Spectral Property of Dissolved Organic Matter in Seawater of Jiaozhou Bay,China

应用三维荧光光谱(excitation-emission matrix spectroscopy,EEMs)研究了不同河流输入有机物对胶州湾海水中溶解有机物荧光特征的影响。结果表明,生活污水和工业废水的排放使附近海水中类腐殖质荧光位置发生红移;类蛋白荧光在海泊河附近最强,类腐殖质荧光在李村河附近最强,中心海区荧光强度最弱,表明沿岸河流输入是胶州湾海水中有机物的主要来源,而中心海区有机物主要来源于现场生物活动。不同河口附近区域样品中有机物的类蛋白和类腐殖质荧光强度之间相关性不同,表明河流输入有机物的影响。胶州湾大部分海水中有机物的类蛋白与类腐殖质荧光强度之间的比值较大,表明可能受到了人类活动产生类蛋白有机物的污染。研究结果对于分析海水中有机物来源以及河流排放污染物的迁移等过程具有一定的指导意义。

Excitation-emission matrix spectroscopy（EEMs） was applied to measure the fluorescence properties of dissolved organic matter（DOM） in seawater collected from Jiaozhou Bay in June,2005.The study areas include central Bay area,receptor areas of Dagu River,Licun River and Haibo River.The aim was to investigate the influence of discharges from several typical rivers to the receiving seawater.Dagu River discharges mostly freshwater,while the other two rivers discharges include more wastewaters from factories and sewages treatments.The results indicate that there is a redshift of the position of humic-like fluorescence peaks due to the discharges from sewages and wastewaters from factories.The intensities of protein-like and humic-like peaks were the strongest in the samples from area near Haibo River and Licun River,while the weakest fluorescence intensities of both protein-like and humic-like were observed in the samples collected from central bay area.This suggests that river inputs are the mains sources of DOM in seawater of Jiaozhou Bay,while DOM produced by bioactivity in situ dominates those in central Bay area.The relationships of protein-like and humic-like fluorescence intensities vary depending on the water samples.The DOM in seawater of Jiaozhou Bay may be polluted by protein-like organic matter produced by human activity,as indicated by higher ratios of protein-like and humic-like fluorescence intensities.The results suggest the potential utility of EEMs technique for trace DOM and land-based pollution sources.