An autonomous instrument for time series analysis of TCO2 from oceanographic moorings
An autonomous instrument for time series analysis of TCO2 from oceanographic moorings
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DOI：
10.1016/j.dsr.2009.04.006
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发表时间：
2009-09-01
影响因子：
2.4
通讯作者：
Eck, Calvert
中科院分区：
文献类型：
--
作者：
Sayles, F. L.;Eck, Calvert
描述了用于海洋系泊自主 TCO2 测量的机器人分析仪的设计和测试。该分析仪采用 TCO2 测量的电导法，其中酸化样品中的 CO2 穿过半透膜扩散到 NaOH 溶液中，降低了碱的电导率。该仪器能够在至少六个月的时间内进行 850 次类似的分析。它的设计运行深度至少为 1000 m。 TCO2 校准基于整个部署过程中的现场标准化。我们报告分析仪的实验室测试和现场测试。在实验室中，在 80 至 25 摄氏度的温度范围内进行了 38 天的自动分析，得出 TCO2 准确度和精确度为 +/-2.7 μmol/kg。在WHOI码头进行了原位测试，部署时间为8周，原位温度为5℃-13℃。基于原位校准，部署期间TCO2分析的准确度和精密度为+/-3.6μmol/kg。还报告了试剂和标准溶液稳定性的实验室测试。基于认证参考材料的标准遵循长达 2 年的时间。在所有情况下，TCO2 均有所增加。标准品的漂移相当于每 6 个月 1 至 3 μmol/kg。发现电导率指示剂溶液可稳定至少 2 个月。 (C) 2009 Elsevier Ltd. 保留所有权利。
The design and testing of a robotic analyzer for autonomous TCO2 measurement from oceanographic moorings is described. The analyzer employs a conductimetric method of TCO2 measurement wherein CO2 from an acidified sample diffuses across a semipermeable membrane into a NaOH solution decreasing the conductivity of the base. The instrument is capable of similar to 850 analyses over a period of at least six months. It is designed to operate to depths of at least 1000 m. TCO2 calibration is based on in situ standardization throughout a deployment.We report both laboratory and in situ tests of the analyzer. In the laboratory automated analyses over a period of 38 days at temperatures ranging from 80 to 25 degrees C yielded a TCO2 accuracy and precision of +/-2.7 mu mol/kg. In situ tests were conducted at the WHOI dock with a deployment of 8 weeks at in situ temperatures of 5 degrees-13 degrees C. The accuracy and precision of TCO2 analyses over the deployment period, based on in situ calibration, was +/-3.6 mu mol/kg.Laboratory tests of reagent and standard solution stability are also reported. Standards, based on Certified Reference Material were followed for periods of up to 2 years. In all cases TCO2 increased. Drift of the standards was the equivalent of similar to 1 to 3 mu mol/kg per 6 months. The conductivity indicator solution was found to be stable for at least 2 months. (C) 2009 Elsevier Ltd. All rights reserved.