Abstract
This paper reports a method for measuring the photosynthetic activity of water plants. Plants in photosynthesis absorb carbon dioxide (CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) and release carbohydrates and oxygen. As CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> is readily soluble in water and decreases pH, the pH of water reflects the degree of photosynthesis of water plants. To quantify the small changes of pH, we applied an automated pH measurement system consisting of an ion-sensitive field effect transistor (ISFET) sensor we developed earlier. The pH measured in a test tank containing the water plant Cabomba caroliniana rose by 0.840 pH after 4 hours of light irradiation. This CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> absorption of the plant during photosynthesis could be determined based on this pH measurement.
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