海洋学研究 ›› 2021, Vol. 39 ›› Issue (2): 52-59.DOI: 10.3969/j.issn.1001-909X.2021.02.006

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自研高精度pH传感器的标定、校正方法及其在海水原位观测中的应用

金铨1，张楚青1,2，吴建波1，张潇3，叶瑛1，黄元凤*4，陶春辉2   

  1. 1.浙江大学 海洋学院，浙江 舟山 316021；
    2.自然资源部 第二海洋研究所，浙江 杭州 310012；
    3.中电海康集团有限公司，浙江 杭州 311100；
    4.山东特种设备检验检测集团有限公司，山东 济南 250002
  • 出版日期:2021-06-15 发布日期:2021-06-15
  • 基金资助:
    浙江省重点研发计划项目(2021C03016)

Calibration and correction method of self-developed high-accuracy pH sensor and their application in in-situ observation of seawater

JIN Quan1, ZHANG Chuqing1,2, WU Jianbo1, ZHANG Xiao3, YE Ying1, HUANG Yuanfeng*4, TAO Chunhui2#br#   

  1. 1.Ocean College, Zhejiang University, Zhoushan 316021, China; 
    2.Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; 
    3.CETCHIK Group Co., Ltd., Hangzhou 311100, China; 
    4.Shandong SEI Science & Technology Co., Ltd., Ji’nan 250002, China
  • Online:2021-06-15 Published:2021-06-15

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摘要： 电化学方法是测量海水pH值的主要方法之一。针对自主研发的基于铱金属及其氧化物电极的pH传感器，建立了海水环境下仪器标定和数据校正的方法，并在近岸和大洋环境中进行了原位测试的应用。仪器标定包括：(1)依照海水pH分析的标度要求选取适当的标定缓冲试剂；(2)以标准海水替代常用的2-氨基吡啶(AMP)溶液制备标定缓冲体系。数据校正主要包括温度背景校正及误差校正。海区原位测试应用以及与其他同类仪器对比表明，标定体系差异带来的误差可达1.00 pH单位，数据校正可提升测试精度0.10～3.00 pH单位不等。仪器的标定与数据校正方法能有效提高该自研pH传感器的测量精度。

关键词: 海水pH, 原位测试, 电化学传感器, 标定, 校正

Abstract: Electrochemical methods are the main methods for measuring seawater pH. The self-developed electrochemical pH sensor is based on iridium metal and its oxide electrode, a method for its calibration and data correction in seawater environment was established and applied for in-situ testing in nearshore and oceanic environments. The instrument calibration includes (1)Selecting appropriate calibration buffer reagents according to the calibration requirements of seawater pH analysis; (2)Preparing calibration buffer system by replacing the commonly used 2-aminopyridine (AMP) solution with standard seawater. Data correction mainly includes temperature background correction and error correction. Insitu testing in the sea area and comparison with other similar instruments show that the error caused by the difference of calibration system can be up to 1.00 pH unit, and the data correction can improve the testing accuracy from 0.10 pH unit to 3.00 pH unit. The calibration and data correction method of the instrument can effectively improve the measurement accuracy of this self-developed pH sensor.

Key words: seawater pH, in-situ test, electrochemical sensor, calibration, correction

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