DKK-TOA Corporation

Automatic total nitrogen/phosphorus/COD analyzer NPW-160

Total phosphorous measurement flow

JIS method NPW-160
Measurement of sample water (50ml)
Potassium peroxodisulfate
Thermal cracking
120°C/30 min.
Cooling in air
Ammonium molybdate solution
L-ascorbic acid
Absorbance measurement (880 nm)
Measurement of sample water(5ml)
Potassium peroxodisulfate
Thermal cracking
120°C/30 min.
Cooling in air
L-ascorbic acid
Ammonium molybdate solution
Absorbance measurement (880nm)
1/5 the usage of the reagent, compared to the JIS method