The determination of nitrate and sulphate in 50% sodium hydroxide solution by ion-chromatography.
Electrolysis in combination with a cation-selective membrane is used to reduce the concentration of sodium hydroxide in the sample, prior to the ion-chromatographic determination of nitrate and sulphate. The advantage and disadvantage of this type of sample pretreatment are discussed.
Petersen
J M
JM
Norsk Hydro Research Center, N-3900 Porsgrunn, Norway.
Johnsen
H G
HG
Lund
W
W