水中总氮快速测定实验方法研究

针对现行总氮标准测定方法存在的操作繁琐、耗时长等缺点,采用COD消解加热器消解代替原标准方法中的高温高压消解步骤,以简化实验步骤、缩短用时,建立快速测定水中总氮的分析方法.通过对本方法进行平行实验、加标回收实验以及与标准方法的对比实验等分析实验结果,方法的线性范围为0 ～ 4.00 mg/L,平均加标回收率是102.3％,标样平行实验的相对标准偏差是1.05％,准确度、精确度和回收率均达到标准要求,方法具有一定的推广价值.

Study on Rapid Determination Method of Total Nitrogen in Water

A rapid determination method of total nitrogen using a COD digestion heater was introduced. The method overcame the shortcomings of the standard method which were complicated and time-consuming. The parallel test, recovery test and the com- paring test with standard method were tried. The linear range of the method was 0 ～ 4.00 mg/L. The average recoveries were 102.3%. Parallel experimental relative standard deviation was 1.05%. This, method was novel, simple and precise. This method has no significant difference in accuracy, precision and recovery compared to the standard method and possessed of popularization and application value,