连二硫酸盐的分解规律研究

Study on Decomposition of Hyposulfate

采用光谱分析方法研究了连二硫酸水溶液的稳定性与酸度、温度的关系,结果表明:连二硫酸及其盐溶液在紫外-可见光区没有明显的光谱吸收.室温下,在硫酸浓度低于1.0mol/L的水溶液中较稳定,当硫酸浓度达6.0mol/L以上,连二硫酸显著分解,生成二氧化硫.在水浴温度下,连二硫酸盐基本不分解,但pH1.0以下,连二硫酸则明显分解,酸度越高,分解越快.

By the spectroscopic methods the relationship with stability of Hyposulfate and acidity and temperature was studied. The result indicated that no absorption occurs between range of ultraviolet - visible light band in hyposulfuric acid and hyposulfate solution . when the coneentrattion of sulphuric acid added is lower 1.0mol/L in room temperature hyposulfate solution is stable, and when the concentrattion of sulphuric acid is higher 6.0mol/L in a water bath temperature, hyposulfuric acid begins to break down into S02. In a water bath temperature, hyposulfate （ pH2.5 ） is not decomposed basically but hyposulfurie acid begin to obviously decompose when pH 〈 1. 0, the higher the acidity, the faster the speed.