Gas flow cell with a built-in gas chromatograph for ultraviolet detection and identification

Lagesson, Verner; Lagesson-Andrasko, Ludmila

doi:10.1039/an9840900867

Cited by 7 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recent works have been presented where gas chromatography has been linked to ultraviolet detection. − These studies indicate low detection limits (down to 0.2 ng 13 ), well-defined spectra which ought to be suitable for computer library search, and clear differences between structural isomers. This also indicates that the GC/UV method could be of considerable analytical value.…”

mentioning

confidence: 99%

The Use of Gas-Phase UV Spectra in the 168−330-nm Wavelength Region for Analytical Purposes. 1. Qualitative Measurements

1998

Self Cite

View full text Add to dashboard Cite

A novel instrument, which combines gas chromatographic separation with ultraviolet detection, has been employed in the qualitative study of molecular UV absorption spectra in the gas phase. The wavelength range available with the current instrument made studies in the region of 168-330 nm possible. The absorption spectra between 168 and 330 nm for ∼1000 organic compounds and a number of inorganic gases were registered. For all the spectra recorded, 69% showed absorption maxima shorter than 190 nm, and as much as 87% shorter than 200 nm. This indicates the importance of the short UV wavelength region for analytical purposes. The results showed that each compound studied gave rise to unique absorption spectra. The influence of temperature on the shape of the spectra was studied in the range of 15-205 °C. A slight broadening effect on spectral absorption bands (0.3 nm) and the vibrational structure (maximally 1.4 nm) with increased temperature was observed. However, this effect was shown to have no influence on the analytical results. In the vast majority of cases, where structural isomers were investigated, there were clear differences between the recorded spectra. Compounds with the same functional group showed pronounced similarities. The influence of conjugation and various substituents could be demonstrated. A commercial computer program was used for a computer search of unknowns against the recorded reference spectra. This showed that the gas-phase UV spectra are very well defined and that a search always resulted in a very close agreement, even if concentrations and chromatographic conditions were different between the recording of reference and unknown. When a search was performed on a compound not present in the library, the result pointed out the correct class of compounds.

show abstract

mentioning

confidence: 99%

The Use of Gas-Phase UV Spectra in the 168−330-nm Wavelength Region for Analytical Purposes. 1. Qualitative Measurements

1998

Self Cite

View full text Add to dashboard Cite

show abstract

“…This instrument, and the various types of separation columns that can be made, has been described earlier (3)(4)(5)(6)(7)(8)(9). The injection mode is direct and the separation columns are just 80 mm long and packed with HPLC-packing materials as support with various ordinary liquid phases applied to it.…”

Section: Methodsmentioning

confidence: 99%

“…Novotny and co-workers (2) have used a dedicated UV spectrophotometer and reported a detection limit for naphthalene that was about one-tenth of that for flame ionization detection (FID). Lagesson and Newman (3)(4)(5)(6)(7)(8)(9) have used a gas flow cell for UV spectrophotometers with a built-in microcolumn gas chromatograph and studied detection and identification of various compounds by spectral scanning of compounds trapped in the light beam. A UV-vis diode array spectrophotometer has been used by Kube and co-workers (10) as a detector for gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

Microcolumn gas chromatography with ultraviolet detection and identification using a photodiode array spectrophotometer

Lagesson¹,

Newman²

1989

Anal. Chem.

View full text Add to dashboard Cite

Gas chromatography combined with ultraviolet (UV) detection and identification using a photodiode array spectrophotometer has been investigated. The study concerned possible detection limits for UV-absorbing compounds at fixed wavelengths and possibilities for identifications based on UV spectra collected "on the fly". Detection limits were found to be on the order of 100 pg using a detection spectral bandwidth of 5 nm on either side of absorption maximum. Because of the high wavelength reproducibility for photodiode array type monochromators, and the absence of any solvent shift, the spectra were found to be accurately defined. Injected amounts of compounds, considered as relatively strong UV absorbers, at the 1-ng level resulted in clearly identifiable spectra including the first derivative of the spectra. When closely related compounds were grouped together, the shapes of the spectra at the near-and far-UV borderline showed clear similarities. However isomers were still easily distinguished from each other.

show abstract

“…[55][56][57] UV/VIS detectors and spectrometers are widely used in liquid chromatographic systems. 43 The first attempts to extend the use of this technique to applications in connection with GC were made in the sixties 58,59 and improved setups, including new gas cells, 60,61 spectrometers with broader frequency ranges (,190 nm) 44 and additional coupled techniques (GC/UV and GC/MS), 62 can be found in the more recent literature. However, so far these hyphenated techniques could not compete with the well established techniques mentioned earlier.…”

Section: The Rotational Fingerprint In Analytical Applicationsmentioning

confidence: 99%

Chemical analysis in the submillimetre spectral region with a compact solid state system

Medvedev

Behnke

Lucia

2006

Analyst

View full text Add to dashboard Cite

A new analytical system that uses the rotational signatures of gas phase molecules is described and demonstrated. It uses a solid state source to probe molecular systems in the millimetre and submillimetre wave range, the only region of the electromagnetic spectrum not yet used extensively for analytical purposes. It employs the FAst Scan Submillimetre Spectroscopy Technique (FASSST), which leads to an especially simple system architecture. Among the attributes of the system are generality, sensitivity, 'absolute' specificity, small size, simplicity, and the potential for very low cost. Applications to problems of analytical interest are also discussed.

show abstract

Gas flow cell with a built-in gas chromatograph for ultraviolet detection and identification

Cited by 7 publications

References 0 publications

The Use of Gas-Phase UV Spectra in the 168−330-nm Wavelength Region for Analytical Purposes. 1. Qualitative Measurements

The Use of Gas-Phase UV Spectra in the 168−330-nm Wavelength Region for Analytical Purposes. 1. Qualitative Measurements

Microcolumn gas chromatography with ultraviolet detection and identification using a photodiode array spectrophotometer

Chemical analysis in the submillimetre spectral region with a compact solid state system

Contact Info

Product

Resources

About