Alkylnaphthalenes: Priority Pollutants or Minor Contributors to the Poor Health of Marine Mussels?

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• 作者：Alan G. Scarlett ; Robert Clough ; Charles West ; C. Anthony Lewis ; Andrew M. Booth ; Steven J. Rowland
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：July 15, 2011
• 年：2011
• 卷：45
• 期：14
• 页码：6160-6166
• 全文大小：803K
• 年卷期：v.45,no.14(July 15, 2011)
• ISSN：1520-5851

文摘

Alkylnaphthalenes (AN) are relatively water-soluble hydrocarbons which, following spillages of crude oils, have been widely reported in contaminated marine organisms such as mussels. In the present report we show, by tandem-gas chromatography-time-of-flight-mass spectrometry (GC 脳 GC-ToF-MS), that the range of AN in contaminated wild mussels from the UK extends beyond the previously GC resolved isomers to those with at least seven substituent carbon atoms. Since surprisingly little information on AN toxicity to such marine organisms has been reported we synthesized two C₈ AN and measured the toxicity of C_2鈥? AN to mussels (clearance rate assay). C_2鈥? AN were appreciably toxic (concentration for 50% clearance rate inhibition, 48 h IC₅₀ 1.4鈥?.6 渭mol g^鈥? dry weight tissue), but several C₄, ₆ and C₈ AN, including branched isomers expected to be resistant to biodegradation and more accumulative, were relatively nontoxic (48 h IC₅₀ > 10 渭mol g^鈥?) and longer term exposure (8d) failed to elicit a greater toxic response. The accumulation profiles of AN in laboratory mussels exposed to oil were similar to those of the wild mussels. Moreover, laboratory oil-exposed mussels depurated toxic C_2鈥? AN within 5 days in clean water and clearance rates recovered. The latter might imply that, in contrast with branched alkyl benzenes tested previously, AN are of less toxic concern, but such a straightforward conclusion cannot necessarily be drawn; a synthetic branched C₈ AN persisted following depuration and was as toxic to mussels as a C₃ AN (IC₅₀ 1.3 渭mol g^鈥?). This indicates that the structures of AN are also important.