Improvement of in situ glass electrode pH sensor for seawater by rapid response glass electrode and removable Ag/AgCl electrode with solid reference junction using vycol glass

The glass membrane pH sensor PH-09 using commercial available glass membrane with separated reference electrode having pressure range up to 3400 m in depth was developed. PH-09 showed good repeatability up to 3400m. Comparison to other commercial glass membrane pH sensor showed good relationship and faster response. Comparison to colorimetric analysis showed lower pH value around -0.15.