Assessment of a pH optode for oceanographic moored and profiling applications

IF 2.1 3区 地球科学 Q2 LIMNOLOGY Limnology and Oceanography: Methods Pub Date : 2024-09-05 DOI:10.1002/lom3.10646
Taylor Wirth, Yuichiro Takeshita, Benjamin Davis, Ellen Park, Irene Hu, Christine L. Huffard, Kenneth S. Johnson, David Nicholson, Christoph Staudinger, Joseph K. Warren, Todd Martz
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Abstract

As global ocean monitoring programs and marine carbon dioxide removal methods expand, so does the need for scalable biogeochemical sensors. Currently, pH sensors are widely used to measure the ocean carbonate system on a variety of autonomous platforms. This paper assesses a commercially available optical pH sensor (optode) distributed by PyroScience GmbH for oceanographic applications. Results from this study show that the small, solid‐state pH optode demonstrates a precision of 0.001 pH and relative accuracy of 0.01 pH using an improved calibration routine outlined in the manuscript. A consistent pressure coefficient of 0.029 pH/1000 dbar is observed across multiple pH optodes tested in this study. The response time is investigated for standard and fast‐response versions over a range of temperatures and flow rates. Field deployments include direct comparison to ISFET‐based pH sensor packages for both moored and profiling platforms where the pH optodes experience sensor‐specific drift rates up to 0.006 pH d−1. In its current state, the pH optode potentially offers a viable and scalable option for short‐term field deployments and laboratory mesocosm studies, but not for long term deployments with no possibility for recalibration like on profiling floats.
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评估用于海洋学系泊和剖面测量的 pH 光学传感器
随着全球海洋监测计划和海洋二氧化碳去除方法的扩展,对可扩展的生物地球化学传感器的需求也在增加。目前,pH 传感器被广泛用于测量各种自主平台上的海洋碳酸盐系统。本文对 PyroScience GmbH 公司销售的用于海洋学应用的市售光学 pH 传感器(optode)进行了评估。研究结果表明,使用手稿中概述的改进校准程序,小型固态 pH 光学传感器的 pH 值精度为 0.001,相对精度为 0.01。在这项研究中测试的多个 pH 光学传感器的压力系数一致,均为 0.029 pH/1000 dbar。在一定的温度和流速范围内,对标准型和快速反应型的响应时间进行了研究。现场部署包括与基于 ISFET 的系泊和剖面平台 pH 传感器套件进行直接比较,在这些平台上,pH 光电极的传感器特定漂移率高达 0.006 pH d-1。从目前的情况来看,pH 光电极有可能为短期野外部署和实验室中观研究提供可行且可扩展的选择,但不适合长期部署,因为不可能像剖面浮标那样进行重新校准。
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来源期刊
CiteScore
4.80
自引率
3.70%
发文量
56
审稿时长
3 months
期刊介绍: Limnology and Oceanography: Methods (ISSN 1541-5856) is a companion to ASLO''s top-rated journal Limnology and Oceanography, and articles are held to the same high standards. In order to provide the most rapid publication consistent with high standards, Limnology and Oceanography: Methods appears in electronic format only, and the entire submission and review system is online. Articles are posted as soon as they are accepted and formatted for publication. Limnology and Oceanography: Methods will consider manuscripts whose primary focus is methodological, and that deal with problems in the aquatic sciences. Manuscripts may present new measurement equipment, techniques for analyzing observations or samples, methods for understanding and interpreting information, analyses of metadata to examine the effectiveness of approaches, invited and contributed reviews and syntheses, and techniques for communicating and teaching in the aquatic sciences.
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Issue Information Issue Information Correction to “Estimating ethanol correction factors for δ13C and δ15N isotopic signatures of freshwater zooplankton from multiple lakes” Multivariate statistical “unmixing” of Indian and Pacific Ocean sediment provenance Assessment of a pH optode for oceanographic moored and profiling applications
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