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Loss rates of acetone in filtered and unfiltered coastal seawater

机译：已过滤和未过滤沿海海水中丙酮的损失率

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摘要

Loss rates of acetone were measured in filtered and unfiltered seawater samples over a 12 month time period at a Pacific Ocean coastal site in Orange County, Southern California, USA, using purge and trap isotope-dilution gas chromatography-mass spectrometry (GC/MS). The average measured first-order rate constant for acetone loss in unfiltered seawater (biotic and abiotic rate) was 0.12 ±0.05 h~(-1) corresponding to a half-life of 5.8 ±2.4 h. The observed loss rate in filtered seawater (abiotic rate) was less than 10% of this. Seasonal variations were observed, with higher loss measured in winter and after rain events. Diurnal effects were also observed, with loss rates higher earlier in the day and lower at noon. These are attributed to seasonal and temporal variations in bacteria concentrations, suggesting that bacterial metabolism may be the primary loss process for acetone in urbanized coastal waters.
机译：使用吹扫捕集同位素稀释气相色谱-质谱法（GC / MS）在美国南加利福尼亚州奥兰治县的太平洋沿海站点测量了经过12个月时间的已过滤和未过滤海水样品中丙酮的损失率。未过滤海水中丙酮损失的平均测得一级速率常数（生物和非生物速率）为0.12±0.05 h〜（-1），对应半衰期为5.8±2.4 h。在过滤的海水中观察到的损失率（非生物发生率）小于此值的10％。观察到季节变化，在冬季和雨后事件中损失较高。还观察到昼夜影响，损失率在一天中的早些时候更高，而在中午时更低。这些归因于细菌浓度的季节性和时间变化，表明细菌代谢可能是城市化沿海水域中丙酮的主要损失过程。

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  • 来源
    《Marine Chemistry》 |2013年第20期|39-44|共6页
  • 作者

    Warren J. de Bruyn; Catherine D. Clark; Lauren Pagel; Harpreet Singh;

  • 作者单位

    School of Earth and Environmental Sciences, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, CA 92866, USA;

    School of Earth and Environmental Sciences, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, CA 92866, USA;

    School of Earth and Environmental Sciences, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, CA 92866, USA;

    School of Earth and Environmental Sciences, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, CA 92866, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    acetone loss; coastal waters; particle-mediated rate;

    机译：丙酮损失沿海水域;粒子介导率;

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