摘要
通过考察空气湿度、进样量、卡尔费休试剂消耗体积、漂移值、分析时间几个因素之间的关系,明确了空气湿度是影响卡尔费休法准确定量化工产品水分的主要原因之一。空气湿度主要改变仪器漂移值,而与样品分析时间无显著关系,当空气相对湿度低于40%时,仪器漂移值基本稳定在10以下,分析时间主要由注入滴定池中样品总水分含量决定。为保证测量数据准确,要保证滴定前漂移值尽可能低且稳定,同时注入滴定池样品总水分含量要在仪器要求的最佳测量范围内。
Through investigating the relationship among several factors including air humidity, sampling amount, consumption volume of Karl– Fischer reagent, drift value, analysis time and so on, it is cleared that the air humidity is one of the main reasons affecting accurate quantification of moisture content in chemical products by Karl-Fischer method. The air humidity mainly vary drift value of the instrument, but has not significant correlation with analysis time of the sample. When the relative humidity of air is lower than 40%, the drift value of the instrument is essentially steady at less than 10, the analysis time is mainly decided by total moisture content of the sample injecting into the titration pool. In order to ensure accuracy to determining data, it is ensured that the drift value before titration is as low and steady as possible. Meanwhile the total moisture content of sample injecting into titration pool needs to stay within the optimal determining range of the instrument.
出处
《化学推进剂与高分子材料》
CAS
2016年第2期83-86,共4页
Chemical Propellants & Polymeric Materials
