离子选择性电极法测定煤中氟含量的影响因素分析

The influencing factors for determination of fluorine content in coal using ion-selective electrode method

基于煤中氟含量的测定是煤炭分析中受影响因素较多的项目之一,对高温燃烧水解-氟离子选择性电极法测量煤中氟含量测定过程中的试剂、仪器、煤样质量、通水蒸气时间、氧气流量、测量电位、干扰离子、氟电极实测斜率等影响因素进行分析,指出采取准确配制试剂、确保仪器验收合格时的最佳状态、准确称取煤样质量、保持适当的通水蒸气时间及氧气流量、选择合适的标准工作溶液及水解冷凝液的pH值等措施可提高其测定结果的准确度。

The determination of fluorine content in coal was a project which was affected by many factors in the analysis of coal. The fluorine in coal was determinated by combustion-hydrolysis fluoride ion selective electrode method. The factors which affected the measurement processs such as reagents, experimental apparatus, weight of coal sample, duration of water vapor, oxygen flow rate, measuring potential, interfering ion and real measured slope of fluorine electrode were researched and discussed. It was indicated adopting the measurements such as making the reagents accurately, the optimal status of apparatus when it was checked, accurate sample weight, suitable duration of water vapor and oxygen flow rate, choosing the suitable standard working solution and PH value of hydrolysis condensate could improve the accuracy of determination.