Study on the Influence of Storage Conditions on the Calibration of Total Organic Carbon(TOC)Analysis Using Sucrose Solution
In order to improve the accuracy of the calibration of total organic carbon(TOC)analyzer using sucrose solution,eliminate interference factors affecting the total organic carbon content,and prepare a series of commercial standard solutions,this study conducted stability and acceleration experiments on low concentration sucrose solution under different water quality,storage temperature,material storage vessel,and humidity conditions,and intergroup difference experiments for three batches of commercial series standard solutions.The results showed that the TOC content of ultrapure water did not change significantly after high-pressure sterilization and remained in the most stable state;The optimal temperature range for storing low concentration sucrose solution in a wide mouthed glass bottle with a twist cap is 4℃ to 20℃.At 20℃,the TOC content in sucrose solution is more stable in a twisted cap polytetrafluoroethylene(PTFE)bottle than in a polypropylene(PP)bottle,and there is no significant difference compared to a glass bottle.The accelerated experimental results showed that there was no significant change in TOC content in PTFE sucrose solution stored under high temperature(40±2℃)and high humidity(75％±5％)conditions for 6 months.In addition,three batches of commercial solutions were randomly selected and standard curves were plotted,achieving good reproducibility and stability.Through analysis,it can be concluded that the TOC content is influenced by factors such as water quality,temperature,storage vessel material,and time.Choosing PTFE can effectively reduce precipitates and improve the stability of TOC content in low concentration sucrose solutions.
万方数据
维普
