Sodium Thiosulfate Standard Solution Results Deviation Control Research

[Objective] To explore the deviation influencing standard solution of sodium thiosulfate.[Method] The factors for influencing stability of sodium thiosulfate stable solution were studied,the key links in the solution calibration process were analyzed,the corresponding key points were tested for controlling the relative deviation of calibration results.[Result] The results showed that,the involved water should be boiling cooling water or new preparation water without CO2 and O2;prepared solution and solution in statistic process should place away from sunshine,in order to avoid influence by environment;after statistics,water should be added for ending the reaction and guaranteeing stable of the results;adding a potassium iodide at a sample titration has significant effects on controlling the deviation.[Conclusion] The study will provide reference for preparation of sodium thiosulfate standard solution.