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| Distribution characteristics and sources of DOM in Bohai Bay seawater during wet season |
| LIU Jing-jing1,2, ZHANG Yan2, ZHAI Hong-yan1, ZHOU Bin2, XING Mei-nan2, LI Hui2, WANG Na-yu3 |
1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China;
2. Tianjin Academy of Eco-Environmental Sciences, Tianjin 300191, China;
3. Tianjin Blue Sky Environment Polytron Technologies Inc, Tianjin 300074, China |
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Abstract The distribution characteristics and sources of dissolved organic matter (DOM) in Bohai Bay water were studied by using three-dimensional fluorescence and ultraviolet spectrum, combined with the parallel molecular model and correlation analysis in order to indirectly understand the sources of other pollutants. The results showed that the DOM content in Bohai Bay water was high in the offshore water, but low away from the coast. The main components were high excitation tryptophan (S peak), low excitation tryptophan (T peak), humic acid (A peak) and fulvic acid (C peak). The protein-like fluorescence peak has a high intensity in the northern part of the study area, and the humus-like peak had a low intensity far away from the coast. Fluorescence indices (FI) of the Bohai Bay and the river into the sea were all about 1.4, indicating that the humus were mainly affected by exogenous sources, and most of them showed strong humic characteristics (HIX >3.0), only the northern part of the study area showed strong autogenetic characteristics due to algae outbreaks (BIX >1.0). Because of the influence of salinity, the UV characteristic absorption wavelength showed that the percentages of fulvic and humic acids (20.18±4.04)% in the coastal water of Bohai Bay were significantly lower than those of the exogenous river (26.43±3.85)%. Seawater with high salinity will cause flocculation of DOM, and the proportion of Fulicid-like acids and Humicid-like acids in DOM will decrease as the suspended solids are absorbed into the seabed sediments. As a whole, DOM in Bohai Bay was significantly affected by exogenous river input in wet season, so it is necessary to strengthen the control and management of exogenous river input pollutants.
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Received: 19 February 2021
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