Abstract
We have been developing new in situ CO 2 and pH sensor (Hybrid CO 2 -pH sensor: HCS) for the cruising AUV. The measurement principle for the CO 2 sensor is based on spectrophotometry. The CO 2 in the surrounding seawater equilibrates with the indicator solution across the gas permeable membranes. The equilibration process causes a change of pH in the indicator solution, which results in the change of optical absorbance. The CO 2 is calculated from the optical absorbance of the pH indicator solution equilibrated with CO 2 in seawater through a gas permeable membrane. In our analytical system, we used an amorphous fluoropolymer tubing form of AF-2400 by DuPont for the gas permeable membrane due to its high gas permeability coefficients. On the other hand, we adopt potentiometric analysis using original glass and reference electrodes as a pH sensor for deep sea because of the most commonly used technique for sea water pH measurements.
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