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首页> 外文期刊>Environmental Science & Technology >Aerobic Soil Biodegradation of 8:2 Fluorotelomer Stearate Monoester
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Aerobic Soil Biodegradation of 8:2 Fluorotelomer Stearate Monoester

机译：8：2含氟调聚物硬脂酸酯的好氧土壤生物降解

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摘要

A laboratory investigation on the biotransformation of 8:2 fluorotelomer stearate monoester (8:2 FTS) in aerobic soils was conducted by monitoring the loss of 8:2 FTS, production of 8:2 fluorotelomer alcohol (8:2 FTOH) and stearic acid, which would be released by cleavage of the ester linkage, and subsequent degradation products from FTOH for 80 d. Soil microcosms were extracted with ethyl acetate followed by two heated 90/10 v/ v acetonitrile/200 mM NaOH extractions. 8:2 FTS was degraded with an observed half-life (t_(1/2)) of 10.3 d. The rate of 8:2 FTS biotransformation substantially decreased after 20 d with 22% of 8:2 FTS still remaining on day 80. No biotransformation of 8:2 FTS occurred in autoclaved soil controls, which remained sterile with 102 ± 6% recovery, through day 20. 8:2 FTOH was generated with cleavage of the ester linkage of 8:2 FTS followed by a rapid decline (t_(1/2) ～ 2 d) due to subsequent biodegradation. All the expected 8:2 FTOH degradation products were detected including 8:2 fluorotelomer unsaturated and saturated carboxylic acids, 7:2s FTOH, 7:3 acid, and three perfluoroalkyl carboxylic acids with the most prominent being perfluorooctanoic acid (PFOA). PFOA consistently increased over time reaching 1.7 ± 0.07 mol % by day 80. Although cleavage of the ester linkage was evidenced by 8:2 FTOH production, an associated trend in stearic acid concentrations was not clear because of complex fatty acid metabolism dynamics in soil. Further analysis of mass spectrometry fragmentation patterns and chromatography supported the conclusion that hydrolysis of the ester linkage is predominantly the first step in the degradation of 8:2 FTS with the ultimate formation of terminal products such as PFOA.
机译：通过监测8：2 FTS的损失，8：2氟调聚物醇（8：2 FTOH）和硬脂酸的生产，对好氧土壤中8：2氟调聚物硬脂酸酯单酯（8：2 FTS）的生物转化进行了实验室研究。通过裂解酯键和随后的FTOH降解产物80 d释放。用乙酸乙酯萃取土壤微观世界，然后进行两次加热的90/10 v / v乙腈/ 200 mM NaOH萃取。 8：2 FTS降解，观察到的半衰期（t_（1/2））为10.3 d。 20天后8：2 FTS生物转化率显着降低，而在80天时仍保留22％的8：2 FTS。在高压灭菌的土壤对照中未发生8：2 FTS生物转化，该灭菌保持无菌，回收率为102±6％，到第20天为止，生成了8：2 FTOH，其8：2 FTS的酯键断裂，随后由于随后的生物降解而迅速下降（t_（1/2）〜2 d）。检测到所有预期的8：2 FTOH降解产物，包括8：2氟调聚物不饱和和饱和羧酸，7：2s FTOH，7：3酸和三种全氟烷基羧酸，其中最突出的是全氟辛酸（PFOA）。 PFOA随时间持续增加，到80天达到1.7±0.07 mol％。尽管通过8：2 FTOH产生证明了酯键的裂解，但由于土壤中复杂的脂肪酸代谢动力学，硬脂酸浓度的相关趋势尚不清楚。质谱碎裂模式和色谱的进一步分析支持以下结论：酯键的水解主要是8：2 FTS降解的第一步，最终形成了终产物（如PFOA）。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.3831-3836|共6页
  • 作者

    Kavitha Dasu; Jinxia Liu; Linda S. Lee;

  • 作者单位

    Department of Agronomy, Purdue University, West Lafayette, Indiana 47907-2054, United States;

    Department of Agronomy, Purdue University, West Lafayette, Indiana 47907-2054, United States;

    Department of Agronomy, Purdue University, West Lafayette, Indiana 47907-2054, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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