Bioaccumulation and Toxic Potencies of Polychlorinated Biphenyls and Polycyclic Aromatic Hydrocarbons in Tidal Flat and Coastal Ecosystems of the Ariake Sea, Japan

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• 作者：Haruhiko Nakata ; Yasufumi Sakai ; Takashi Miyawaki ; and Akira Takemura
• 刊名：Environmental Science & Technology
• 出版年：2003
• 出版时间：August 15, 2003
• 年：2003
• 卷：37
• 期：16
• 页码：3513 - 3521
• 全文大小：299K
• 年卷期：v.37,no.16(August 15, 2003)
• ISSN：1520-5851

文摘

Sediment and marine biota comprising several species oftidal flat and coastal organisms were analyzed forpolychlorinated biphenyls (PCBs) including non- and mono-ortho coplanar congeners and polycyclic aromatichydrocarbons (PAHs) to examine bioaccumulation profilesand toxic potencies of these contaminants. Concentrationsof PCBs in tidal flat organisms ranged from 3.6 ng/g (wet wt)in clams to 68 ng/g (wet wt) in omnivore tidal flatfishes,a discernible trend reflecting concentrations and trophiclevels. In contrast, PAHs concentrations were the highestin lower trophic organisms, such as crabs and lugwormsfrom tidal flat, whereas those in coastal fishes, squid, andfinless porpoises were less than detection limit. Greaterbioaccumulation of PAHs was found in lugworms and crabs,which might be due to their direct ingestion of sedimentparticulates absorbed with PAHs. TCDD toxic equivalents(TEQs) were calculated for PCBs and PAHs in sedimentsand biota. PCBs accounted for a greater proportion of totalTEQs (TEQs: sum of TEQ_PCB and TEQ_PAH) in coastaland tidal flatfishes (>95%), while PAHs occupied aconsiderable portion of TEQs in sediment (>97%).Interestingly, TEQ_PAH accounted for 37% and 81% of theTEQs in crabs and clams, respectively. Benzo[b]fluoranthenewas the dominant contributor to TEQ_PAH in both thespecies. Considering these observations, the environmentalrisks of PAHs may not be ignored in benthic tidal flatorganisms due to their greater bioaccumulation throughsediments.