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目的 :考察在室温条件下不同相对湿度对磷酸稳定性的影响。方法 :在室温条件下将磷柳酸放入不同相对湿度的干燥器中放置观察 ,定时取样 ,通过用磷钼杂酸还原比色法测定其水解产物磷酸而计算磷柳酸的含量及吸湿率。结果 :根据实验得出在室温、不同相对湿度及放置一定时间间隔后磷柳酸的含量和吸湿率。结论 :磷柳酸在室温低湿度条件下吸湿度很小 ,含量变化较小 ;在室温高温度条件下吸湿度较大 ,含量明显降低 ,特别是相对湿度 90 %条件下分解更为严重。
Objective: To investigate the effect of different relative humidity on the stability of phosphoric acid at room temperature. METHODS: Phosalic acid was placed in a desiccator of different relative humidity at room temperature for observation. Samples were taken periodically. Phosphoric acid was determined by hydrolysis of phosphomolybdic acid and reduction colorimetric method to calculate the content of phosalic acid and the hygroscopicity . Results: According to the experiment, the content of phosphatidic acid and the moisture absorption rate were obtained at room temperature, different relative humidity and after a certain time interval. CONCLUSION: Phosphorus salicylic acid has little moisture content and little change in content under low temperature and room temperature conditions. The moisture content is higher under room temperature and higher temperature, and the content is lower obviously, especially when the relative humidity is 90%.