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气体A在液体b中的溶解度(浓度)[A]_b和分压P_A的关系符合Henry定律〔A〕_b=kP_A时,如以色谱载气从溶液中萃取A,则P_A=〔A〕_aRT,式中〔A〕。为载气中A的浓度。因此在温度恒定时,〔A〕_b正比于〔A〕_a。当求得溶解气体在不同温度下的萃取率时,即可进行溶液中溶解气体的测定。根据上述原理测定了水中溶解氧、氮及总二氧化碳。萃取装置及色谱条件: 改装100毫升医用注射器为萃取器,即在针头与针管之间用一段乳胶管联接。
When the relationship between the solubility (concentration) [A] _b of the gas A in the liquid b and the partial pressure P_A complies with Henry’s law [A] _b = kP_A, if A is extracted from the solution as the chromatographic carrier gas, P_A = [A] _aRT , Where [A]. A carrier gas concentration. Therefore, at a constant temperature, [A] _b is proportional to [A] _a. When determining the extraction rate of dissolved gases at different temperatures, the dissolved gas in the solution can be measured. The dissolved oxygen, nitrogen and total carbon dioxide in the water were determined according to the above principle. Extraction device and chromatographic conditions: Refit 100 ml medical syringes for the extractor, that is, between the needle and needle with a latex tube connection.