Standard Test Method for Determination of Total Nitrogen, Total Kjeldahl Nitrogen by Calculation, and Total Phosphorus in Water, Wastewater by Ion Chromatography

Importancia y uso:

5.1 This test method allows the simultaneous determination of total nitrogen and total phosphorous from one sample digestion step.

5.2 This test method measures oxidized ammonia and organic nitrogen (as nitrate) and soluble nitrate simultaneously. By subtracting the nitrate + nitrite value from a non-digested sample gives a TKN:

When using this test method:





where:

TN   =   total nitrogen, and TKN   =   total Kjeldahl nitrogen.

Subcomité:

D19.06

Referida por:

D5975-17

Volúmen:

11.02

Número ICS:

13.060.50 (Examination of water for chemical substances)

Palabras clave:

alkaline persulfate digestion; ion chromatography; nitrate; ortho-phosphate; phosphate; total Kjeldahl nitrogen; total nitrogen; total phosphate;