Systea S.p.A.

Analytical Technologies

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Micromac Total N&P

On line analyzer for nitrogen and phosphorus
monitoring in surface and waste water
 

Micromac C TN&TP is designed to analyze Total Nitrogen and Total Phosphorus in the same device; UV digestion is applied for Total N, UV and high temperature digestion for Total P.

The measurement is performed in a combined mode, ensuring one hour of measurement for both parameters; 4-20 mA  data output is provided at the same time.

Measurement method 

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.
The sample after proper filtration is pumped inside the LFA reactor, where after injection of H2SO4 is trapped inside the high temperature 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 hydrazinein 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 bluemolybdenum by ascorbic acid. The coloured complex is read at 660 or 880 nm.
 

Technical specification

  Total N Total P
Measuring principle Colorimetric, UV digestion + UV reduction to NO3 Colorimetric, acidic hydrolosis and UV digestion
Measuring range 0-5/10/20/50 mg/l as N  0-3/5/10 mg/l as P

 

Features and benefits

  • TN&TP measured in the same device
  • One hour analysis time for both parameters
  • Fully automatic operation
  • Long autonomy; low maintenance and operating cost
  • Low reagents consumption
  • Easy operation; plug in analyzer, no special training is required
  • Electronics and hydraulics separated
  • Serial interface for local or remote PC connection

The results of the analysis are displayed in the same moment, after 1 hour.

Last modified on Wednesday, 14 October 2015 11:36