Coastal zone sediments are the main carriers and destinations for the migration and transformation of pollutants.Dissolved organic matter(DOM),as an important medium for heavy metal migration in the environment,plays an important role in controlling the distribution and migration of heavy metals in sediments.The paper used the factor index and ground accumulation index methods to assess the current pollution status of five heavy metals,Cr,Cu,Zn,As and Pb,in the Surface sediment of the northern coastal zone of Jiaozhou Bay,and combined with three-dimensional fluorescence spectroscopy to analyze the spatial partitioning patterns of different DOM components in sediments,to explore the relationship between DOM composition and heavy metal migration behavior in the Surface sediment of the northern Jiaozhou Bay area.The results showed that the overall heavy metals in the coastal zone sediments were lightly contaminated;the natural DOM fractions in the sediments included four types of terrestrial fulvic acid(C1),terrestrial humic substances(C2),microbial-derived humic substances(C3)and tryptophan-like(C4),and the proportion of humic acid fractions was significantly higher than that of protein-like fractions in the whole area,and their sources were influenced by both terrestrial input and biological metabolism.Each heavy metal may have similar pollution sources,but different migration mechanisms cause differences in their distribution;C1 promotes the natural migration of Cr,each DOM fraction influences the distribution of heavy metals in sediments through different adsorption complexation mechanisms,and there are certain mutual transformation processes among DOM fractions.
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