Sum of Oxidized Nitrogen, NO2-N and NO3-N/NOX

Last changed: 31 March 2022

Known issues with the parameter and/or important method changes

Report (in Swedish) about method comparison while changing to the Gallery instrument.

Report (in Swedish) about verification of the analysis when changing back from Gallery to Autoanalyser III in in 2018.

Current method of measurement

Discrete analysis, photometric

Valid since July 2014 (from September 2018 only used for some projects with high levels)
Method: ISO 15923-1:2013
Instrument: Gallery

Autoanalyzer

Valid since 3rd September 2018
Method: SS-EN ISO 13 395
Instruments: Autoanalyzer 3

Previous methods (autoanalyzer)

2000-01 – 2014-05
Method: SS-EN ISO 13 395 modified for Bran & Leubbe Method G-287-02.
Instruments: Autoanalyzer 3 (upgraded Autoanalyzer II).

1998-07 – 2006-12
Method: SS 02 81 33-2 modified for Traacs. Bran & Leubbe Method No. J-002-88B.
Instrument: Technicon Traacs 800.
NB: Water samples conserved with H2SO4.

1997-01 – 1998-06
Method: Swedish Standard SS 02 81 33-2 modified for Traacs. Bran & Leubbe Industrial Method 55010279A.
Instrument: Technicon Traacs 800.
NB: Water samples conserved with H2SO4.

1989-01 – 1996-12
Method: Swedish Standard SIS 02 81 33 modified for Traacs. Bran & Leubbe Industrial Method 55010279A.
Instrument: Technicon Traacs 800.
NB: Water samples conserved with HgCl2.

1984-01 – 1988-12
Method: Wood, E. D., Armstrong, F. A. & Richards, F. A., J. Mar. Biol. Ass. U. K., 1967, 47, 23-31. Modified for autoanalyser: Henriksen, A. R. & Selmer-Olsen, A. R., Analyst 1970, 95, 514-518. Koroleff, F.,1969. ICES report C. M. 1969/C:8.
NB: Water samples conserved with HgCl2.

1971-01 – 1983-12
Method: Wood, E. D., Armstrong, F. A. & Richards, F. A., J. Mar. Biol. Ass. U. K., 1967, 47, 23-31. Modified for autoanalyser. Henriksen, A. R. & Selmer-Olsen, A. R., Analyst 1970, 95, 514-518. Koroleff, F., 1969. ICES report C. M. 1969/C:8.
Instrument: Techincon Autoanalyzer I.
NB: Water samples conserved with HgCl2.

1965-01 – 1970-12
Method: Mullin, J. B. & Riley, J. P., 1955. Anal. Chim. Acta. 12. Modified for autoanalyser: Henriksen, A., 1965. The Analyst 90:83.
Instrument: Techincon Autoanalyzer I.
NB: Water samples conserved with HgCl2.