title: Composition and sources of organic matter and its solvent extractable components in surface sediments of a bay under serious anthropogenic influences: Daya Bay, China.
abstract: Organic matter of nine surface sediments from the Daya Bay was Soxhlet-extracted with a mixture of 2:1 (v/v) dichloromethane-methanol and separated into five fractions: non-aromatic hydrocarbons, aromatic hydrocarbons, ketones, alcohols, and fatty acids and asphaltenes, and analyzed to determine their bulk and biomarker composition. Marine autogenic input appears to be a major source of organic matter. Generally, non-aromatic hydrocarbons are the most dominant fraction of solvent-extractable organic matter (EOM) followed by the other four fractions in decreasing amounts: fatty acids and asphaltenes, ketones, alcohols and aromatic hydrocarbons. On average, both non-aromatic hydrocarbon fraction and fatty acid and asphaltene fraction account for approximately 40% of EOM. The sources of acyclic methyl ketones, alkanols and fatty acids were examined. For n-alkan-2-ones, allochthonous input is a more important source than marine autogenetic input; the reverse is true for n-fatty acids; for n-alkanols, allochthonous and autogenetic inputs seem comparable. Both n-alkan-2-ones and n-fatty acids in the surface sediments of different areas appear to be derived from common sources.
authors.affiliation: Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
authors.forename: Xuelu
authors.initials: X
authors.lastname: Gao
authors.forename: Shaoyong
authors.initials: S
authors.lastname: Chen
authors.forename: Aimin
authors.initials: A
authors.lastname: Long
mesh_terms: D015415:Biomarkers; D002681:China; D017753:Ecosystem; D019015:Geologic Sediments / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D009792:Oceans and Seas; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D015415:Biomarkers; D007220:Industrial Waste; D014874:Water Pollutants, Chemical