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空气中二氧化硫一般采用溶液吸收作比色测定,盐酸付玫瑰苯胺比色法对试剂要求严格,操作较繁杂。测定溶解在水溶液中的二氧化硫多采用碘量法,此法不适宜浓度较低的试样的分析。气敏电极的发展为直接测定某些溶解气体提供了简便、快速的工具。有关二氧化硫气敏电极已有报导,它具有一些化学方法所没有的优点,能用于测定水溶液和空气中的二氧化硫。二氧化硫气敏电极是由一浸在含亚硫酸氢钠的内充液中的一平板状pH玻璃电极作指示电极,以银-氯化银电极作参比电极,并以憎水透气膜使内充
Sulfur dioxide in the air is generally absorbed by the solution for colorimetric determination, hydrochloric acid to pay rose aniline colorimetric reagent demanding, the operation is more complicated. Determination of dissolved sulfur dioxide in aqueous solution to use more iodine method, this method is not suitable for the analysis of lower concentration of the sample. The development of gas sensing electrodes provides a simple and quick tool for the direct determination of some dissolved gases. Sulfur dioxide gas sensing electrodes have been reported to have some of the advantages that chemical methods do not have and can be used to determine sulfur dioxide in aqueous solutions and air. Sulfur dioxide gas sensing electrode is composed of a flat-type pH glass electrode immersed in sodium bisulfite-containing filling liquid as an indicator electrode, a silver-silver chloride electrode as a reference electrode, and a hydrophobic gas permeable membrane Charge