深海pH探测电极自校正技术实验研究

Experimental study on self-calibration technique of deep-sea pH exploration electrode

为了实现深海热液pH值的长期原位探测,采用2种缓冲液对pH探测电极在海底进行原位自校正.利用Fluent软件对容积为10 mL的探头腔进行了结构优化设计,为保证探头腔内的液体被冲洗干净,对腔体的主要结构参数进行了仿真计算.仿真结果表明,当入射半角为37°,长宽比为1.5时,探头腔内流体的总体流动趋势较理想,回流现象较少.为了实现自校正的功能,设计了一种利用2种缓冲液进行标定的流体控制系统.利用该流体控制系统,实验测试了pH=4.003和6.864的2种缓冲液在所设计的10 mL探头腔内相互冲洗的效果.结果表明,2种缓冲液的相互冲洗都可以在6 min内完成,从而证实了所设计的冲洗装置有实用价值.

pH exploration electrodes need to be self-calibrated in the seafloor in order to implement long-time in-situ pH exploration for the deep-sea hydrothermal fluid.A method was presented using two buffers to on-line calibrate pH electrodes,and a 10 mL probe chamber was designed.Fluent software was used to simulate and calculate the main structure parameters of the chamber to ensure a kind of liquid in the chamber be replaced by another kind of liquid completely.The simulation indicates that the whole flow is re...