Determination of dissolved oxygen in the cryosphere: a comprehensive laboratory and field evaluation of fiber optic sensors.
Determination of dissolved oxygen in the cryosphere: a comprehensive laboratory and field evaluation of fiber optic sensors.
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DOI：
10.1021/es102571j
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发表时间：
2011-01
影响因子：
11.4
通讯作者：
E. Bagshaw;J. Wadham;M. Mowlem;M. Tranter;J. Eveness;A. Fountain;J. Telling
中科院分区：
文献类型：
--
作者：
E. Bagshaw;J. Wadham;M. Mowlem;M. Tranter;J. Eveness;A. Fountain;J. Telling
冰冻圈科学的最新进展表明，冰冻环境是微生物群落的宿主，其功能和动力学通常受溶液中溶解氧（DO）浓度的控制。到目前为止，只有有限的现场测定溶解氧已在这些环境中。他们揭示了潜在的变化率，超过现实的手动采样率，强调需要探索的方法，连续测量溶解氧浓度。我们报告的第一个全面的现场和实验室性能测试的光纤传感器（PreSens，里根斯堡，德国）测量溶解氧在冰冷的生态系统。在低温和标准温度（-5至20 °C）下进行的一系列实验室测试显示出高精度（50 μmol/kg时为0.3%，300 μmol/kg时为1.3%），快速响应时间（<20 s）和最小漂移（<0.4%）。冻融的存活是有问题的，除非传感器膜被机械地固定到纤维上并由不锈钢护套保护。在瑞士阿尔卑斯山和南极洲实地部署传感器的结果基本上表明，其性能与实验室测试一致，上级传统方法。
Recent advances in the Cryospheric Sciences have shown that icy environments are host to consortia of microbial communities, whose function and dynamics are often controlled by the concentrations of dissolved oxygen (DO) in solution. To date, only limited spot determinations of DO have been possible in these environments. They reveal the potential for rates of change that exceed realistic manual sampling rates, highlighting the need to explore methods for the continuous measurement of DO concentrations. We report the first comprehensive field and laboratory performance tests of fiber-optic sensors (PreSens, Regensburg, Germany) for measuring DO in icy ecosystems. A series of laboratory tests performed at low and standard temperatures (-5 to 20 °C) demonstrates high precision (0.3% at 50 μmol/kg and 1.3% at 300 μmol/kg), rapid response times (<20 s), and minimal drift (<0.4%). Survival of freeze thaw was problematic, unless the sensor film was mechanically fixed to the fiber and protected by a stainless steel sheath. Results of two field deployments of sensors to the Swiss Alps and Antarctica largely demonstrate a performance consistent with laboratory tests and superior to traditional methods.