Systea S.p.A.

Analytical Technologies

希思迪-Micromac 总氮&总磷


总氮总磷

水和废水在线监测分析仪

Micromac C 总磷&总氮是一款专门设计制造可同时用于测量总氮和总磷的含量分析仪;总氮的测量使用UV消解法,总磷使用UV+高温消解法。

分析仪在测量期间执行复合模式,总磷总氮的测量总时间少于一个小时;且同时输出4-20毫安的数据信号。

测量方法

The sample after proper filtration is pumped inside the LFA
reactor, where after injection of H2SO4 is trapped inside the
high temp heating bath for inorganic P hydrolysis. During
the hydrolysis time, the analyzer runs a complete TN test on
the same sample, by adding the oxidation reagents and
passing through a UV digestion step, to convert Nitrogen
into Nitrate by UV radiation in persulfate alkaline medium.
The nitrates formed are then reduced to nitrites by hydrazine
in alkaline solution, where copper is used as catalyst; the
nitrites react with sulphanilamide and
naphtylethylendiamine in acid solution, to form a pink
colored compound measurable at 550 nm.
The reactor is washed and then the analyzer opens the
heating bath and adds in the digested sample a proper
oxidant to convert all the organic forms of phosphorus into
orthophoshate, by the double action of potassium
persulphate and UV radiation in acid environment. The
orthophosphate formed reacts with molybdate to form
phosphomolybdate, which is finally reduced to blue
molybdenum by ascorbic acid. The coloured complex is
read at 660 or 880 nm.
样品经适当过滤后被泵入LFA反应器,加入硫酸后置于高温水浴皿进行无机磷的水解。水解的同时,分析仪对同一样品进行总氮的测量,样品加入氧化剂后进行紫外消解步骤,在碱性过硫酸盐介质中由紫外辐射作用将氮转化为硝酸盐。硝酸盐在铜的催化下,经碱性联氨溶液作用被还原为亚硝酸盐;亚硝酸盐继而与磺胺和萘基乙二胺在酸性条件下形成粉色化合物,并在550nm下进行比色分析。 反应器经清洗后,分析仪打开水浴皿,在已经水解的样品中加入氧化剂,在酸性过硫酸钾及紫外辐射的双重作用下所有有机磷均转化为正磷酸盐。正磷酸盐继而与钼酸盐反应生成磷钼酸盐,最终磷钼酸盐被抗坏血酸还原成蓝色化合物磷钼蓝,并在660nm或880nm下进行比色分析。

技术规格说明


总氮 总磷
测量原理 比色法,UV消解 + UV还原 比色法,酸性水解 + UV消解
测量范围 0-5/10/20/50 毫克/升 氮
0-3/5/10 毫克/升磷

特征与优点

  • 同一台仪器同时测量总磷总氮
  • 一个小时完成所有两个参数的测量
  • 全自动操作
  • 长自主性;低维护;低操作成本
  • 低试剂消耗量
  • 便于操作;无需特殊培训
  • 电子与水力模块完全隔离
  • 提供连接本地或远程电脑的串行接口
  • 两个参数的测量数据在一个小时后一同显示在屏幕上