期刊
LIMNOLOGY AND OCEANOGRAPHY-METHODS
卷 7, 期 -, 页码 371-381出版社
AMER SOC LIMNOLOGY OCEANOGRAPHY
DOI: 10.4319/lom.2009.7.371
关键词
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资金
- Danish Natural Science Research Council
- Danish National Research Foundation
- Chilean National Commission for Scientific and Technological Research (CONICYT)
- Agouron Institute
- Gordon and Betty Moore Foundation
The methods used until now have not been able to reliably resolve O(2) concentrations in oceanic oxygen minimum zones below 1-2 mu mol L(-1). We present a new amperometric sensor for the determination of ultra-low O(2) concentrations under in situ conditions. The electrochemical STOX O(2) sensor contains a primary sensing cathode and a secondary cathode that, when polarized, prevents entry of O(2) into the sensor. This arrangement enables frequent in situ zero calibration and confers the sensor with a detection limit of 1-10 nmol L(-1) O(2), even during application on a Conductivity-Temperature-Depth (CTD) profiler at great water depths. The sensor was used during the Galathea 3 Expedition to demonstrate that the core of the oxygen minimum zone (OMZ) off Peru contained < 2 nM O(2). Application in a reactor on board demonstrated that changes in O(2) concentrations in OMZ water containing < 200 nmol L(-1) O(2) could be monitored over periods of hours to days. The linear decrease in O(2) concentration in the reactor indicated very low (< 20 nmol L(-1)) half saturation constants for the O(2) respiring microbial community.
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