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首页> 外文期刊>International Journal of Geosciences >13C/12C Isotope Fractionation during Aerobic and Anaerobic Biodegradation of Naphthalene
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13C/12C Isotope Fractionation during Aerobic and Anaerobic Biodegradation of Naphthalene

机译：萘的好氧和厌氧生物降解过程中的13C / 12C同位素分馏

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Microcosm experiments were conducted to determine the fractionation of stable carbon isotopes during biodegradation of naphthalene. The microcosms were performed under aerobic conditions, anaerobic (amended with sulfate, amended with nitrate and with no amendments) and sterile controls. The liquid phase was analyzed to determine naphthalene concentration and stable carbon isotope signature. Aerobic microcosm showed that naphthalene degraded aerobically within 60 hours. The δ13C increased from -25.5‰ to -25.1‰ (enrichment of 0.4‰ ± 0.08‰) in a single sample in which 95% of the naphthalene was biodegraded. Anaerobic microcosms show that after 288 days, the microcosms with no amendments, amended with nitrate and amended with sulfate had consumed respectively 30%, 50% and 60% of naphthalene on average, compared to control microcosms. Under the denitrifying conditions, the δ13C of naphthalene increased from -25.2‰ to -23.9‰ (enrichment of 1.3‰ ± 0.3‰) after a 95% of naphthalene biodegradation. For the unamended microcosms, a slight enrichment on δ13C napththalene was detected, from -25.2‰ to -24.5‰ (enrichment of 0.7‰ ± 0.3‰) after a biodegradation of approximately 65% of naphthalene (after 288 days). For sulfate reducing microcosms, no significant changes were detected on the δ13C during naphthalene biodegradation.
机译：进行了微观实验，以确定萘生物降解过程中稳定碳同位素的分馏。微观世界是在有氧条件下，厌氧（用硫酸盐修正，用硝酸盐修正且无修正）和无菌对照下进行的。分析液相以确定萘浓度和稳定的碳同位素特征。有氧微观世界表明，萘在60小时内有氧降解。在其中95％的萘被生物降解的单个样品中，δ13C从-25.5‰增加到-25.1‰（富集度0.4‰±0.08‰）。厌氧性微观世界显示，在288天后，与对照微观世界相比，未进行修饰，用硝酸盐修正和用硫酸盐修正的微观世界平均分别消耗了30％，50％和60％的萘。在脱氮条件下，萘的δ13C经过95％的生物降解后，从-25.2‰增至-23.9‰（富集度1.3‰±0.3‰）。对于未经修饰的微观世界，在萘经过约65％的生物降解（288天后）后，检测到δ13C萘有少量富集，从-25.2‰至-24.5‰（富集0.7‰±0.3‰）。对于减少硫酸盐的缩影，在萘生物降解过程中未检测到δ13C的显着变化。

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