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首页> 外文期刊>Environmental Science & Technology >Robust Optode-Based Method for Measuring in Situ Oxygen Profiles in Gravelly Streambeds
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Robust Optode-Based Method for Measuring in Situ Oxygen Profiles in Gravelly Streambeds

机译：基于光电二极管的稳健方法在砾石河床中测量原位氧分布

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摘要

One of the key environmental conditions controlling biogeochemical reactions in aquatic sediments like streambeds is the distribution of dissolved oxygen. We present a novel approach for the in situ measurement of vertical oxygen profiles using a planar luminescence-based optical sensor. The instrument consists of a transparent acrylic tube with the oxygen-sensitive layer mounted on the outside. The luminescence is excited and detected by a moveable piston inside the acrylic tube. Since no moving parts are in contact with the streambed, the disturbance of the subsurface flow field is minimized. The precision of the distributed oxygen sensor (DOS) was assessed by a comparison with spot optodes. Although the precision of the DOS, expressed as standard deviation of calculated oxygen air saturation, is lower (0.2-6.2%) compared to spot optodes (＜0.1- 0.6%), variations of the oxygen content along the profile can be resolved. The uncertainty of the calculated oxygen is assessed with a Monte Carlo uncertainty assessment The obtained vertical oxygen profiles of 40 cm in length reveal variations of the oxygen content reaching from 90% to 0% air saturation and are characterized by patches of low oxygen rather than a continuous decrease with depth.
机译：控制诸如河床之类的水沉积物中生物地球化学反应的关键环境条件之一是溶解氧的分布。我们提出了一种使用基于平面发光的光学传感器对垂直氧分布进行原位测量的新方法。该仪器由透明的丙烯酸管组成，在其外部安装了对氧气敏感的层。发光被丙烯酸管内部的可移动活塞激发并检测到。由于没有运动部件与流化床接触，因此将地下流场的干扰降到了最低。分布式氧气传感器（DOS）的精度通过与点光电二极管的比较进行评估。尽管DOS的精度（以计算出的氧气饱和度的标准偏差表示）比点光电二极管（＜0.1- 0.6％）要低（0.2-6.2％），但是可以解决沿剖面的氧气含量的变化。使用蒙特卡洛不确定性评估评估计算出的氧气的不确定性。所获得的40厘米长的垂直氧气分布图揭示了氧气含量从90％到0％的空气饱和度的变化，其特征是低氧斑块而不是低氧斑块。随深度不断减小。

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  • 来源
    《Environmental Science & Technology》 |2013年第17期|9858-9865|共8页
  • 作者

    Michael Vieweg; Nico Trauth; Jan H. Fleckenstein; Christian Schmidt;

  • 作者单位

    Department of Hydrogeology, UFZ - Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318 Leipzig, Germany,Water & Earth System Science (WESS) Competence Cluster, University of Tuebingen, Hoelderlinstrasse 12, 72074 Tuebingen, Germany;

    Department of Hydrogeology, UFZ - Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318 Leipzig, Germany,Water & Earth System Science (WESS) Competence Cluster, University of Tuebingen, Hoelderlinstrasse 12, 72074 Tuebingen, Germany;

    Department of Hydrogeology, UFZ - Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318 Leipzig, Germany;

    Department of Hydrogeology, UFZ - Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318 Leipzig, Germany;

  • 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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