Potassium, K

Last changed: 21 May 2021

Known issues with the parameter and/or important method changes

No problems reported.

Current method of measurement

Valid since October 2000
Method: ICP (Inductively coupled plasma), SS-EN ISO 11885:2009.
Instrument: VarianVista AX and PerkinElmer OPTIMA 2100 (since 2008)

Previous methods

1989-10 – 2000-09
Method: ICP (Inductively coupled plasma).
Instrument: Jobin Yvon JY 24.

1983-01 – 1989-09
Method: Atomic absorption spectroscopy. SIS,
Instrument: Varian AA 1475.

1967-01 – 1982-12
Method: Atomic absorption spectroscopy. SIS,
Instrument: PerkinElmer AA Model 303.

1965-01 – 1966-12
Method: Jönsson, E., 1964. Mälarundersökningen, Metodmeddelande nr 1, Lågfotometrisk bestämning av kalcium, magnesium, natrium och kalium (The Mälaren Investigation, Method message no. 1, Flame photometric determination of calcium, magnesium, sodium and potassium, in Swedish).
Instrument: Unicam flame photometer SP 900.