硫代硫酸钠标准溶液稳定性及配制准确性探讨

PREPARATION OF SODIUM THIOSULFATE STANDARD SOLUTION AND DISCUSSIONS ON ITS STABILITY

溶液的酸度、水质、空气及光照等因素对硫代硫酸钠标准溶液的稳定性及滴定反应有很大影响，而条件误差、人为误差对标定硫代硫酸钠标准溶液的准确度的影响也很大。结果表明，在消除以上各因素条件下配制的硫代硫酸钠标准溶液，室温下完全可以保存２个月浓度基本不变。

Factors such as the solution acid degree, water quality,air and light make great influences on the stability and titration reaction of the standard sodium thiosulfate solution,so do the condition errors and man made errors on accuracy of its standardization The results indicate that the standard sodium thiosulfate solution prepared under the condition of eliminating the above stated factors can basically sustain its concentration at room temperature for 2 months.