As a key index to measure the buffering capacity of marine carbonate systems, the total alkalinity (TA) of seawater plays an important role in monitoring and predicting ocean acidification. Given the limitation of the existing TA measuring techniques to laboratory environments and the difficulty in continuous real-time monitoring of marine fields, the existing TA analyzer was optimized based on single-step titration spectrophotometry. Then, a hardware system covering sample collection, measurement and analysis, data processing and storage, power supply, and control system was established by integrating the overall architectural design and development of the raft microcirculation system, dual-path photoelectric detection system, and mini-instrument. Besides, the corresponding instrument control, data processing and analysis software and user-friendly interface were developed, because of which the detection error and precision of the analyzer were < 1 % and ± 3.6 μmol/kg, respectively. The study results provide a high-precision and high-efficiency seawater TA measuring tool for scientific marine research and environmental monitoring.
Zhang L., Yuan D., Zhang Y., Zhang K., Wu B. & Wang Y., 2025. Optimal design and application of in-situ seawater total alkalinity analyzer. Journal of Physics: Conference Series 3057: 012045. doi: 10.1088/1742-6596/3057/1/012045. Article.
