GUO Jian-yang1, WANG Jing1, ZHU Yuan-rong2, ZHANG Rui-qing2
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Chinese Research Academy of Environmental Sciences, Beijing 100080, China)
Abstract：Soxhlet and Tenax extraction methods, together with the size and density separation of sediment, were used for investigation on the occurrence and redistribution of polycyclic aromatic hydrocarbons (PAHs) in sediments from Dianchi Lake, Southwest China. The results suggested that PAHs in sediments from Dianchi Lake were primarily occurred in the fractions of small particle and low density. Though exists there size distribution of PAHs in sediments, to some extent, the composition and content of carbonaceous sorbents are the main causes influencing the occurrence of PAHs in sediments. Due to the different interactions of PAHs with different geosorbents, PAHs in sediments would be redistributed as the depositional time increased. That is, PAHs adsorbed on weak sorbents, such as amorphous organic matters and/or inorganic minerals, would be gradually transferred to carbonaceous sorbents, such as black carbon and coke. Therefore, PAHs in sediments would be sequestrated slowly and their bioavailability could be decreased gradually.
Key words: sediment; polycyclic aromatic hydrocarbons; occurrence; redistribution; Dianchi Lake.
EARTH AND ENVIRONMENT Vol. 42, No.1, Tot No.297, 2014, Page 11-16
