...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental toxicology and chemistry >DESORPTION KINETICS OF FLUORANTHENE AND TRIFLURALIN FROM LAKE HURON AND LAKE ERIE, USA, SEDIMENTS
【24h】

DESORPTION KINETICS OF FLUORANTHENE AND TRIFLURALIN FROM LAKE HURON AND LAKE ERIE, USA, SEDIMENTS

机译：美国休伦湖和伊利湖沉积物中氟和三氟尿素的解吸动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Description kinetics were determined for fluoranthene (FLU) and trifluralin (TF) spiked onto Lake Erie and Lake Huron, USA, sediments at three concentrations (10, 40, 100 mg/kg dry wt). Following four months of equilibration, desorption was measured by extraction with Tenax~(~R) and the data were fit to a first-order three-compartment kinetic model. The rate constants of the rapidly (k_(rap)), slowly (k_(slow)), and very slowly (k_(vs)) desorbing fractions were on the orderof 10~(-1)/h, 10~(-2-3)/h, and 10~(-4)/h, respectively. The t_(99.9) (time required for 99.9% of the FLU and TF to desorb from each pool value) for each compartment indicated that FLU and TF desorption from rapid, slow, and very slow compartments were on the order of hours, days, and years, respectively. Higher rates of desorption were observed for FLU and TF from the Lake Huron sediments and this was not apparently related to the total organic carbon (TOC), particle size distribution, or polarity (carbon-to-nitrogen ratio) of the sediments. In general, the total fraction of the initial contaminant amounts that desorbed over the time course was directly related to concentration, which we hypothesized was due to the combined effects of saturation of high-energy (slow and very slow) binding sites in the organic carbon matrix and hysteresis. In extrapolations to field conditions, FLU and TF were predicted to persist in the sediments for years due to the very slow desorption of an estimated 31 to 53% of the bulk concentrations. Based on the rapidly desorbing fractions, the bioavailable amounts of the contaminants were predicted to be between 31 to 55% of bulk sediment concentrations.
机译：测定了动力学动力学，测定了三种浓度（10、40、100 mg / kg干重）沉积物在美国伊利湖和休伦湖上的荧蒽（FLU）和三氟拉林（TF）的动力学。平衡四个月后，通过用Tenax萃取来测量解吸，并将数据拟合为一阶三室动力学模型。快速（k_（rap）），缓慢（k_（slow））和非常缓慢（k_（vs））解吸组分的速率常数分别为10〜（-1）/ h，10〜（-2） -3）/ h和10〜（-4）/ h。每个隔室的t_（99.9）（99.9％的FLU和TF从每个池值中解吸所需的时间）表明，FLU和TF从快速，慢速和非常慢的隔室中解吸的时间约为数小时，数天，和年份。观察到休伦湖沉积物中FLU和TF的解吸速率更高，这显然与沉积物中的总有机碳（TOC），粒度分布或极性（碳氮比）无关。通常，随时间推移而解吸的初始污染物总量中的总分数与浓度直接相关，我们假设这是由于有机碳中高能（慢速和非常慢）结合位点饱和所产生的综合影响矩阵和磁滞。在外地条件下推断，由于估计缓慢吸收了约31％至53％的总浓度，FLU和TF会在沉积物中持续存在多年。基于快速解吸的馏分，污染物的生物利用度预计为整体沉积物浓度的31％至55％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号