卡尔费休滴定法测水简易装置的改进  

IMPROVEMENT OF THE DEVICE FOR THE DETERMINATION OF TRACE WATER BY KARL-FISCHER′S VOLUMETRIC METHOD

作　　者：戴玉杰[1] 路福平[1] 王敏 赵俊[1] 

机构地区：[1]天津科技大学生物工程学院,天津市工业微生物重点实验室,天津300222

出　　处：《化学分析计量》2005年第2期45-46,共2页Chemical Analysis And Meterage

摘　　要：用带橡皮塞的导管将滴定管的上口与锥形瓶连接构成一个密闭的滴定装置,将此装置应用于卡尔费休容量法测定水含量,在滴定过程中所有试剂与外界完全隔开,防止了滴定过程中空气中水蒸气的干扰,滴定终点明显,且能稳定8 h以上.用该装置对甲醇样品中的水进行测定,回收率为100.4%～100.9%,测定结果的相对标准偏差小于0.25%.The improvement was conducted to the open-ended titration device of burette and conical flask for the determination of trace water by Karl-Fischer′s volumetric method. In this device, a glass tube with rubber plugs was used to connect the upper end of the burette and the conical flask to form an airtight titration system. When the device was applied to the Karl-Fischer method for the determination of trace water, the vapor interference could be prevented effectively and the end point of titration became obvious and could exist for more than 8 hours. The recovery is 100.4%~ 100.9%, and the relative standard deviation is less than 0.25%.

关 键 词：简易装置 橡皮塞 导管 测定结果 滴定法 上口 中空 甲醇 锥形 容量法 

分 类 号：O655[理学—分析化学] R446[理学—化学]