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Enhanced Sorption of PAHs in Natural-Fire-Impacted Sediments from Oriole Lake, California

机译：加利福尼亚奥里奥湖天然火撞击沉积物中多环芳烃的增强吸附

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Surface sediment cores from Oriole Lake (CA) were analyzed for organic carbon (OC), black carbon (BC), and their <513C isotope ratios. Sediments displayed high OC (20-25%) and increasing BC concentrations from ~0.40% (in 1800 C.E.) to ~0.60% dry weight (in 2000 C.E.). Petrographic analysis confirmed the presence of fire-derived carbonaceous particles/BC at ~2% of total OC. Natural fires were the most likely cause of both elevated polycydic aromatic hydrocarbon (PAH) concentrations and enhanced sorption in Oriole Lake sediments prior to 1850, consistent with their tree-ring-based fire history. In contrast to other PAHs, retene and perylene displayed decreasing concentrations during periods with natural fires, questioning their use as fire tracers. The occurrence of natural fires, however, did not result in elevated concentrations of black carbon or chars in the sediments. Only the 1912-2007 sediment layer contained anthropogenic particles, such as soot BC. In this layer, combining OC absorption with adsorption to soot BC (using a Freundlich coefficient n = 0.7) explained the observed sorption well. In the older layers, n needed to be 0.3 and 0.5 to explain the enhanced sorption to the sediments, indicating the importance of natural chars/inertinites in sorbing PAHs. For phenanthrene, values of n differed significantly between sorption to natural chars (0.1-0.4) and sorption to anthropogenic black carbon (>0.5), suggesting it could serve as an in situ probe of sorbents.
机译：分析了来自Oriole Lake（CA）的地表沉积物核的有机碳（OC），黑碳（BC）及其<513C同位素比。沉积物显示出较高的OC（20-25％），并且BC浓度从〜0.40％（在1800 C.E.下）增加到〜0.60％干重（在2000 C.E.下）。岩相分析证实存在火源碳质颗粒/ BC，占总OC的〜2％。自然火灾是导致1850年前Oriole Lake沉积物中多环芳烃（PAH）浓度升高和吸附增强的最可能原因，这与基于树环的火灾历史一致。与其他多环芳烃相比，在自然火灾期间，烯和per的浓度降低，这质疑了它们作为火示踪剂的用途。但是，自然火灾的发生并未导致沉积物中黑碳或炭的浓度升高。只有1912-2007年的沉积层含有人为颗粒，例如BC烟灰。在这一层中，结合了OC吸收和对烟灰BC的吸附（使用Freundlich系数n = 0.7）可以解释所观察到的吸附良好。在较旧的层中，n必须为0.3和0.5才能说明对沉积物的吸附增强，表明天然炭/惰质岩在吸附PAHs中的重要性。对于菲来说，n值在对天然碳的吸附（0.1-0.4）和对人为的黑碳（> 0.5）的吸附之间存在显着差异，这表明它可以用作吸附剂的原位探针。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2626-2633|共8页
  • 作者

    Julia Sullivan; Kevyn Bollinger; Anthony Caprio; Mark Cantwell; Peter Appleby; John King; Bertrand Ligouis; Rainer Lohmann;

  • 作者单位

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Sequoia & Kings Canyon National Parks, National Park Service, Three Rivers, California 93271, United States;

    ORDNHEERL-Atlantic Ecology Division, U.S. Environmental Protection Agency, Narragansett, Rhode Island 02882, United States;

    Dept of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, U.K;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Laboratory of Applied Organic Petrology, Universitat Tubingen, 72070 Tubingen, Germany;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, 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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