Phosphate phosphorus, PO4-P

Last changed: 29 March 2019

Report (in Swedish) about method comparison while changing to the Gallery instrument (Metodjämförelse vid byte till Gallery).

Samples with a concentration below the reporting limit of the Gallery instrument (4 µg/l), except samples ordered by the Department of Soil and Environment, are also analysed with the QuAAtro instrument which has a reporting limit of 1 µg/l.

Known issues in the databases

Since June 2014 are phosphate-P reported with a background correction, where influence from particles and background colour is subtracted from the measured concentration. For some sites this gives a jump in the time series from higher to lower concentrations. An evaluation of the implications of this is currently made (2019) and a report which describes how this change can be handled will be published here.

Current method of measurement (discrete analysis, photometric)

Valid since June 2014
Method: ISO 15923-1:2013
Instrument: Gallery

Current method of measurement (low concentrations)

Valid since March 2019
Metod: SS-EN ISO 15681-2:2005 mod. QuAAtro method Q-064-05 Rev. 8.
Instrument: QuAAtro.

Previous methods (autoanalyzer)

2016 05 - 2019 02 (only selected samples)
Method: Bran*Luebbe Method No. G-175-96 Rev. 15 (Multitest MT 18).
Instrument: Bran*Luebbe Autoanalyzer 3.
Note: No conservation of water samples. The analyses with the autoanalyzer were only made for some samples with a concentration lower than the reporting limit of the Gallery instrument (4 µg/l). The autoanalyzer had a reporting limit of 1 µg/l.

2000-01 – 2014-05
Method: Bran & Leubbe Method No. G-175-96 2nd ed.
Instrument: Bran & Leubbe Autoanalyzer 3.
NB: No conservation of water samples.

1997-01 – 1999-12
Method: Swedish Standard SS 02 81 26-2 modified for autoanalyser.
Instrument: Technicon Autoanalyzer II.
NB: No conservation of water samples.

1987-01 – 1996-12
Method: Schuster, H. H.: 1969. Arch. Hydrobiol. 65:4. Koroleff, F. ICES C.M. 1968, C33.
Instrument: Technicon Autoanalyzer II.
NB: Water samples conserved with HgCl2.

1969-01 – 1986-12
Method: Schuster, H. H.: 1969. Arch. Hydrobiol. 65:4. Koroleff, F. ICES C.M. 1968, C33.
Instrument: Technicon Autoanalyzer I.
NB: Water samples conserved with HgCl2.

1965-01 – 1968-12
Method: Proctor, C. & Hood, D. W., 1954. Journal of Marine Research. Vol. 13. No. 1. Modified for autoanalyser.
Instrument: Technicon Autoanalyzer 1.
NB: Water samples conserved with HgCl2.


Contact
Page editor: Lars.Sonesten@slu.se