Sorption and accumulation kinetics of polycyclic aromatic hydrocarbons in marine rotifer (Brachionus sp.)

Autor: Shu-Ying Lee, 李叔螢
Rok vydání: 2013
Druh dokumentu: 學位論文 ; thesis
Popis: 101
Planktonic organisms play an important role in driving the fate of persistent organic pollutants (POPs) in the marine environment. As a first step in the aquatic food web, plankton is a key to bring POPs from the aquatic environment into the food web. The objectives of this study are (i) to investigate the bioaccumulation of polycyclic aromatic hydrocabons (PAHs) in rotifer (Briachionus sp.), (ii) to compare the sorption and accumulation kinetics of PAHs in rotifer by diffusive uptake, feeding on phytoplankton, and both, and (iii) to discuss the relationship between bioconcentration factor (BCF),bioaccumulation factor (BAF), and octanol-water partition coeffient (Kow).This study includes three experiments. First, use gas-purging system to maintain constant dissolved PAH levels in the reactor and carry on sorption experiment. Second, feed rotifer on contaminated Nannochlorpsis oculata (as the ingestion experiment). Third, we maintain constant dissolved PAH levels in the reactor and feed rotifer on contaminated Nannochlorpsis oculata for the mixing experiment. For each experiment, we sampled every 24 hours to analysis PAHs concentration and biology condition for 120 hours. This study shows that the adsorption of four PAHs on rotifer approaches to saturation after 72 hours. Furthermore, there is no obvious biomagnification in transfer from phytoplankton to rotifer. Lastly, the passive uptake instead of active ingestion dominates the accumulation of PAHs in rotifer. Distribution of BCF and BAF of PAHs are correlated with their hydrophobicities ( Kow values). The knowledge of the PAHs accumulation in rotifer through sorption and ingestion opens a door to future understanding of the biogeochemical exchanges of PAHs in field primary food webs.
Databáze: Networked Digital Library of Theses & Dissertations
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