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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jan 2008, 29 (1)                                                                                                             Back


Molecular size as a limiting characteristic for bioconcentration in fish

Yuki Sakuratani*1, Yoshiyuki Noguchi1, Katsumi Kobayashi1, Jun Yamada1 and Tsutomu Nishihara2

1Chemical Management Center, National Institute of Technology and Evaluation,

2-49-10, Nishihara, Shibuya-ku, Tokyo 151-0066, Japan

2Osaka University, Suita-shi, Osaka 565-0871, Japan

(Received: November 17, 2006 ; Revised received: April 15, 2007 ; Accepted: May 04, 2007)

Abstract: The relationships between the bioconcentration factor (BCF) of chemicals in fish and their size, as characterized by molecular weight (MW), effective cross sectional diameter (Deff), and maximum diameter (Dmax) have been investigated using an experimental data set of 737 new and 441 existing chemicals monitored by the Japanese Chemical Substances Control Law (CSCL). Substances with BCF >5000 (very high bioconcentration potential) typically have MW < 550, Deff < 1.1 nm and Dmax < 2.0 nm, respectively, and the substances with BCF >1000 (high bioconcentration potential) have MW < 550, Deff < 1.4 nm and Dmax < 2.9 nm, respectively. Therefore, the previously suggested threshold values for Deff (0.95 nm) and Dmax (1.5 nm) used for discriminating between bioconcentrative and non-bioconcentrative substances were found to be somewhat small. We found that many substances with BCF >1000 and Dmax >1.5 nm have Deff < 0.95 nm

Key words: Bioconcentration factor, Molecular size, Effective cross sectional diameter, Maximum diameter

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