Application of High Frequency Methods to Detection of Bands in Partition Chromatography

Baumann, Fred; Blaedel, W. J.

doi:10.1021/ac60109a002

Cited by 17 publications

(7 citation statements)

References 5 publications

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“…However, the phase angle between the voltage at points Ur and Vx, as given by Equation 3= arctan (R/uL)(l -2/ 02) 1 + R/Rs (3) is a monotonic function of the frequency, and is zero at the resonant frequency independent of the resistive elements in the network. This is the basis for the operation of the detector.…”

Section: Description Of Instrumentmentioning

confidence: 99%

Universal detector for liquid chromatography based upon dielectric constant

Klatt¹

1976

Anal. Chem.

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A liquid chromatography detector based upon dielectric constant is described. The detector employs a modular phaselocked-loop circuit with its operating frequency determined by the dielectric constant of the column effluent. Readout is the shift in frequency resulting from changes in solution dlelectric constant as a solute band elutes from the column. Response is independent of intrinsic solvent conductivity and dielectric loses associated with dipole-dipole relaxation. The detector has excellent stability and reproducibility, negligible sensitivity tto variations in solvent flow rate, and the capability of operating without any restrictions on solvent dielectric constant. Separations employing low and high dielectric constant eluants were monitored. An average detection limit of 0.0005 A€ was measured in low dielectric constant media.Comparison with the uv and refractive index monitors indicates that the dielectric constant detector should find numerous applications in liquid chromatography.

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Section: Description Of Instrumentmentioning

confidence: 99%

Universal detector for liquid chromatography based upon dielectric constant

Klatt¹

1976

Anal. Chem.

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“…They also thank B. R. Sant for assistance during the latter part of the work. LITERATURE CITED (1) Bacarella, A., David, F. D., Grun-wald, E., Anal. Chem.…”

Section: Acknowledgmentmentioning

confidence: 99%

High Frequency Technique for Continuous Recording in Chromatographic Analysis of Bile Acids

Johansson¹,

Karrman²,

Norman³

1958

Anal. Chem.

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sisting of a U-tube made from borosilicate glass 4 mm. in outside diameter, and packed with 0.2 gram of Burrell high-activity charcoal held in place with wads of glass wool and bent wire, is purged and sealed as in preparation of the sample tubes.The tube is unstoppered and cooled in ice water, and 20 liters of the air to be tested are aspirated through it at the rate of 0.5 liter per minute. It is then restoppered and kept at reduced temperature until time of analysis. Samples may be stored for 2 to 3 weeks without apparent loss.Analysis. The sample is transferred to the analytical column by connecting the sampling tube to a magnesium perchlorate tube and then to the gas pipet and the chromatograph. The gas pipet and the perchlorate drying tube should first be flushed with helium. Desorption and transfer of the sample are accomplished by inserting the sampling tube in an oil bath maintained at 200°C. Simultaneously, the magnesium per-14, 121 (1953).(4) Jacobs, . B., "Analytical Chemistry of Industrial Poisons, Hazards and Solvents," 2nd ed., Interscience,

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“…Since the laborious extraction and derivatization that is essential for gas chromatographic analysis is not required, it has also been extensively studied and automated for the analyses of carboxylic acids (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16), environmental waters (17,18), and artificial mixtures (19)(20)(21)(22)(23)(24)(25)(26)(27)(28).…”

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confidence: 99%

“…These oxidation methods, however, are not applicable to the persistent carboxylic acids and interfered with other oxidizable compounds. A variety of other monitoring methods have been explored, e.g., conductometric (4), infrared spectrophotometric (25), flame ionization (26), high frequency (27), and coulometric (28) methods. However, these methods of detection belong to either acidity measurement or measurement of bulk properties, and are not specific for carboxyl group in a molecule.…”

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confidence: 99%