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江苏省理化测试中心设计生产的GH—Ⅲ型光合仪是由高精度、小量程的专用pH计和具有采样功能的气路系统组成。其工作原理是在一定温度条件下,一定浓度的碳酸氢钠溶液的pH值,是随着溶解在其中的二氧化碳数量多少而改变,使溶液吸收或放出的二氧化碳与空气中的二氧化碳浓度保持着平衡的关系。 当空气中CO_2减少时,溶液中CO_2也相应减少,与此同时,pH值随即提高。被测定的叶片在同化室(叶室)内进行光合作用。在气泵的吸力下,经同化室开口处进入同化室的气流,是其光合作用的二氧化碳源,经光合作用变化了的气样,由气泵吸入电极槽重碳酸盐溶液内,发生上述化学变化。而改变溶液pH值,用高精度的pH计测定溶液的pH变化值,便可推算光合进程中流经溶液的CO_2
GH-Ⅲ-type photosynthesis apparatus designed and manufactured by Jiangsu Physical and Chemical Testing Center is composed of a high-precision, small-scale dedicated pH meter and a gas path system with sampling function. Its working principle is that under a certain temperature, the pH value of a certain concentration of sodium bicarbonate solution is changed with the amount of carbon dioxide dissolved therein, so that the carbon dioxide absorbed or released by the solution is kept in balance with the carbon dioxide concentration in the air Relationship. When CO 2 decreases in the air, the CO 2 in the solution also decreases, and at the same time, the pH increases. The measured leaf photosynthesis in the assimilation chamber (leaf chamber). In the suction pump, through the opening of the assimilation chamber into the assimilation chamber of the air, its photosynthesis of carbon dioxide source, the photosynthesis of gas samples by the air pump inhalation electrode tank bicarbonate solution, the chemical changes occur . And change the pH value of the solution, with a high-precision pH meter to measure the pH value of the solution, we can calculate the process of photosynthesis through the solution of CO_2