High-frequency spectrophotometric measurements of total dissolved inorganic carbon in seawater.
High-frequency spectrophotometric measurements of total dissolved inorganic carbon in seawater.
复制标题
海水中总溶解无机碳的高频分光光度测量。
DOI：
10.1021/es400567k
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发表时间：
2013
影响因子：
11.4
通讯作者：
Katherine A. Hoering
中科院分区：
文献类型：
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作者：
Zhaohui Aleck Wang;Sophie N. Chu;Katherine A. Hoering
提出了一种新的海水中溶解无机碳（DIC）的连续测定方法。它采用逆流设计和高CO2渗透膜（Teflon AF 2400），实现酸化样品和指示剂溶液之间的流通CO2平衡，快速响应时间约为22 s。与现有的分光光度法相比，该方法将时空分辨率提高了1个数量级以上。流通平衡允许连续（~ 1Hz）检测和实时数据平滑。对于给定的流过样品，该方法的短期精密度为± 2.0 μmol kg（-1）。它实现了± 3.6 μmol kg（-1）的现场精度，并成功地捕获了高DIC变异性，低至分钟尺度。在海洋DIC的典型范围内，新方法的测量结果与已建立的方法的测量结果吻合良好（平均差异为-1.6至0.3 μmol kg（-1），1σ ± 6.0-6.7 μmol kg（-1））。该精密度和准确度水平与现有分光光度法相当。新方法的特点使其特别适用于海洋中移动的观测平台所需的高频水下测量。它也可以适用于高频，分光光度法测量海水CO2逸度。
A new spectrophotometric method was developed to achieve continuous measurements of total dissolved inorganic carbon (DIC) in seawater. It uses a countercurrent flow design and a highly CO2-permeable membrane (Teflon AF 2400) to achieve flow-through CO2 equilibration between an acidified sample and an indicator solution with a fast response time of ~22 s. This method improves the spatiotemporal resolution by more than 1 order of magnitude compared to the existing spectrophotometric method. The flow-through equilibration allows for continuous (~1 Hz) detection and real-time data smoothing. The method had a short-term precision of ± 2.0 μmol kg(-1) for a given flow-through sample. It achieved a field precision of ± 3.6 μmol kg(-1) and successfully captured high DIC variability down to minute scales. Measurements by the new method over the typical range of oceanic DIC showed good agreement with measurements made by an established method (mean differences -1.6 to 0.3 μmol kg(-1) with 1σ ± 6.0-6.7 μmol kg(-1)). This level of precision and accuracy is comparable to that of the existing spectrophotometric method. The characteristics of the new method make it particularly suitable for high-frequency, submerged measurements required for mobile observing platforms in the ocean. It can also be adapted for high-frequency, spectrophotometric measurements of seawater CO2 fugacity.
DOI：
10.1097/00002480-199609000-00058
发表时间：
1996
期刊：
ASAIO journal (American Society for Artificial Internal Organs : 1992)
影响因子：
--
作者：
Baskaran,H;Nodelman,V;Ultman,JS;Richard,RB;Panol,G;High,KM;Snider,MT
通讯作者：
Snider,MT