Two-dimensional conductometric detection in ion chromatography. Postsuppressor conversion of eluite acids to a salt

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Analytical Chemistry (Washington); (United States)

DOI:https://doi.org/10.1021/ac00047a023· OSTI ID:6770790

Berglund, I; Dasgupta, P K ^[1]

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1. Texas Tech Univ., Lubbock (United States)

A simultaneous cation/anion-exchange scheme is proposed where the effluent eluite acids from a suppressed anion chromatography system proceed through the annular channel of a dual membrane converter device composed of an anion and a cation-exchange membrane tube. The optimum regenerants consist of LiF doped with LiOH for the cation side and LiF doped with HF (or NH[sub 4]HF[sub 2]) for the anion side. Sensitivity to very weak acids is far better than detection in the suppressed mode and is also improved markedly over a previously described system involving sequential ion exchange to NaOH. A model is presented for the process, and qualitative agreement to the experimental data is established. The two-dimensional information permits the estimation of the pK[sub a] of unknown eluites. 15 refs., 7 figs., 1 tab.

• DOE Contract Number: FG05-84ER13281
• OSTI ID: 6770790
• Journal Information: Analytical Chemistry (Washington); (United States), Journal Name: Analytical Chemistry (Washington); (United States) Vol. 64:23; ISSN 0003-2700; ISSN ANCHAM
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
CHROMATOGRAPHY
DATA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
ION EXCHANGE
MATHEMATICAL MODELS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SEPARATION PROCESSES
THERMODYNAMIC PROPERTIES