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

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 Autoanalyzer 3 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
Instrument: Since 1 september 2022 – Seal, AutoAnalyzer 500 (AA500)
Until 31 augusti 2022 – Autoanalyzer 3

Previous methods (autoanalyzer)

2007-01 – 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.