基于光学传感器的海水溶解氧现场采样测定方法研究

针对当前溶解氧传感器在海上现场采样测定中缺乏技术规程的现状，本文以AADI 4831型光学溶解氧传感器为实验对象，系统分析了测量瓶特性对传感器测量结果的影响，探索了适用于海上现场操作的快速校准方法，建立了完整的现场采样测定方法并进行了海上现场应用。研究结果表明：测量瓶的容积与材质对于测定结果无显著影响，但是气密性会影响测定数据的稳定性；相比于亚硫酸钠溶液调节法，氮气调节法更适合用于海上现场快速校准方法，采用6个校准点即可满足校准需求，传感器30天内无需重复校准；传感器法测定结果与碘量法较为一致，实验室验证精密度和准确度分别为0.178%和2.605%，南海16个站位实测结果与碘量法测定结果平均偏差为5.297 μmol·L-1，传感器测定较碘量法可节约近三分之二的耗水量。本文建立了基于光学传感器的海水溶解氧现场采样测定方法并进行了海上现场应用，为提高海洋现场调查效率和溶解氧传感器的标准化应用提供了技术支撑。

英文摘要:

In view of the current lack of technical guidelines for dissolved oxygen sensors in marine on-board sampling and measurement, this study systematically analyzed the influence of measurement bottle characteristics on sensor performance using the AADI 4831 optical dissolved oxygen sensor. A rapid calibration method suitable for field operations was explored, and a comprehensive on-board sampling and measurement protocol was established and applied in marine field tests. The results indicate that the volume and material of the measurement bottle have no significant impact on the results, but airtightness affects data stability. Compared to the sodium sulfite solution calibration method, the nitrogen gas calibration method is more suitable for rapid field calibration, with six calibration points sufficient to meet requirements. The sensor requires no recalibration within 30 days. The sensor-based measurements were consistent with the Winkler (iodometric) method, demonstrating laboratory precision and accuracy of 0.178% and 2.605%, respectively. Field tests at 16 stations in the South China Sea showed an average deviation of 5.297 μmol·L-1 from the Winkler method, while the sensor method reduced water consumption by nearly two-thirds. This study establishes an optical sensor-based on-board sampling and measurement method for seawater dissolved oxygen and validates its marine application, providing technical support for improving marine survey efficiency and standardizing dissolved oxygen sensor use.

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