Performance of annular membrane and screen-tee reactors for postcolumn-reaction detection of metal ions separated by liquid chromatography

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00128a018· OSTI ID:7170422

Cassidy, R M; Elchuk, S; Dasgupta, P K

The experimental factors that contribute to base line noise in the postcolumn-reaction detection of metal ions eluted from high-performance dynamic ion exchangers have been evaluated and compared for a screen-tee reactor (approx. 1 ..mu..L internal volume) and three annular membrane reactions having internal volumes of 1.5, 5.3, and 9.6 ..mu..L. Measurements of mixing homogeneity, performed with pulseless gas-pressure pumping, showed that both reactor designs gave a mixing homogeneity that was 99.983% of that theoretically possible (perfect mixing) for two solutions differing in absorbance by 2.38 units. For normal operation with high-performance reciprocating pumps for eluent delivery, pump pulsations were responsible for 90-100% of the observed peak-to-peak noise. Column efficiency measurements with a series of lanthanide metal ions gave similar curves for both designs (HETP values of 0.01-0.04 mm). Both reactors gave reproducible peak areas, had good peak shapes, and operated reliably. With the membrane reactors some leakage of eluent into the reagent solution occurred at high eluent or reagent flow rates, but this was not a problem for normal operating conditions.

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ontario
• DOE Contract Number: FG05-84ER13281
• OSTI ID: 7170422
• Journal Information: Anal. Chem.; (United States), Vol. 59:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHEMICAL REACTORS
EFFICIENCY
PERFORMANCE
LIQUID COLUMN CHROMATOGRAPHY
MEMBRANES
RARE EARTHS
EXPERIMENTAL DATA
POROUS MATERIALS
SIGNAL-TO-NOISE RATIO
CHROMATOGRAPHY
DATA
ELEMENTS
INFORMATION
MATERIALS
METALS
NUMERICAL DATA
SEPARATION PROCESSES
400102* - Chemical & Spectral Procedures
400105 - Separation Procedures