甲醛—电导法测定工业废水中NH_4^+离子的含量

Using Formaldehyde-Conductance method to determine the content of ammoniumtion in industrial waste water

用甲醛与工业废水中NH_4^+定量反应释放出H^+,用电导率仪测量电导率变化值,通过工作曲线求出工业废水中NH_4^+的含量。此法回收率99.2％～100.8％对化工厂排放的废水进行水样分析,并与蒸馏法进行比较,相对标准偏差CV=0.5％～0.59％,蒸馏法相对标准偏差CV=0.613％～0.144％。此法快速,设备简单,操作方便,准确度高,重现性好。不受其它离子干扰,适合化工厂和环境监测。

We used formaldehyde to quantitatively react with ammonium ion in industrial waste water and then released hydrogen ion. This caused the change of conductivity in water. We used conductivity instrument to determine the change value of the conductivity. Using this method, its recovery was among 99.2% to 100.8% . Through analyzing the waste water sample drained by the chemical plant and being compared with the method of distillation, its relative standard deviation CV was among 0.5% to 0.59%, While with the method of distillation, its relative standard deviation CV was among 0.613% to 1.44%. This method determined rapidly and its equipment was single and its operation was convenient and with better accuracy and reappearance. It wasn' t disturbed by other ions and it was adaptable to the detect for chemical plant and environment.