In situ quantification of ultra‐low O2 concentrations in oxygen minimum zones: Application of novel optodes
In situ quantification of ultra‐low O2 concentrations in oxygen minimum zones: Application of novel optodes
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最低氧区超低 O2 浓度的原位定量：新型光极的应用
DOI：
10.1002/lom3.10126
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
R. Glud
中科院分区：
文献类型：
--
作者：
M. Larsen;Philipp Lehner;S. Borisov;I. Klimant;J. Fischer;F. Stewart;D. Canfield;R. Glud
用于量化水生环境中O2可用性的传统传感器通常具有> 1 μmol L−1的检测限（LOD），并且没有足够的分辨率来可靠地测量强烈O2耗尽环境中的浓度。我们提出了一种新的痕量光学传感器的基础上的钯（II）-苯并卟啉发光体，固定在全氟基质具有高透氧性。该痕量传感器的检测限为0.5nmol L−1，动态范围可扩展至0.22 μmol L−1。该传感器的响应时间< 30 s，对流体静压和温度的响应小、可预测且完全可逆。该传感器在最低含氧区（OMZ）深度剖面测量过程中表现出出色的稳定性。新的传感器使用配备了两个额外的O2光学传感器的Trace Oxygen Profiler仪器（TOP）进行现场部署，具有更高的动态范围，当组合时，允许使用单个仪器测量从0.55 nmol L−1到1000 μmol L−1的O2浓度。TOP仪器部署在东热带北太平洋和孟加拉湾的OMZ区域。测量结果表明，ETNP中的O2浓度通常低于痕量传感器的LOD，但在OMZ核心中可以观察到大的亚微摩尔O2侵入，跨越60-80 m，最大O2浓度超过50 nmol L−1。与ETNP相比，BoB中的O2浓度很高，很少低于50 nmol L−1，但表现出巨大的小规模变异性。
Conventional sensors for the quantification of O2 availability in aquatic environments typically have limits of detection (LOD) of > 1 μmol L−1 and do not have sufficient resolution to reliably measure concentrations in strongly O2 depleted environments. We present a novel trace optical sensor based on the palladium(II)‐benzoporphyrin luminophore, immobilized in a perfluorinated matrix with high O2 permeability. The trace sensor has a detection limit of ∼5 nmol L−1 with a dynamic range extending up to ∼2 μmol L−1. The sensor demonstrates a response time < 30 s and a small, predictable, and fully reversible response to hydrostatic pressure and temperature. The sensor showed excellent stability for continuously measurements during depth profiling in Oxygen Minimum Zones (OMZ). The novel sensor was deployed in situ using a Trace Oxygen Profiler instrument (TOP) equipped with two additional O2 optical sensors, with higher dynamic range, allowing, when combined, measurements of O2 concentration from ∼5 nmol L−1 to 1000 μmol L−1 with a single instrument. The TOP instrument was deployed in the OMZ regions of the Eastern Tropical North Pacific (ETNP) and Bay of Bengal (BoB). The measurements demonstrated that O2 concentrations in the ETNP generally were below the LOD of the trace sensor, but that large sub‐micromolar O2 intrusions, spanning 60–80 m with maximum O2 concentrations above 50 nmol L−1, could be observed in the OMZ core. The O2 concentrations in the BoB were high compared to the ETNP and rarely decreased below 50 nmol L−1, but demonstrated tremendous small‐scale variability.
影响因子：
2.7
作者：
Larsen, Morten;Borisov, Sergey M.;Glud, Ronnie N.
通讯作者：
Glud, Ronnie N.
Aanderaa 和 Sea-Bird 氧气光极的压力响应
影响因子：
2.2
作者：
Bittig;B. Fiedler;P. Fietzek;A. Körtzinger
通讯作者：
A. Körtzinger