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1

Digitale Medien

Sample capacity of open tubular and fused silica capillary micro-packed columns (1986)

Malik, A. ; Jumaev, A. R. ; Berezkin, V. G.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 312-313

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused silica capillary micro-packed columns ; Open tubular columns ; Sample capacity ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090518

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2

Digitale Medien

Electron capture detector response to low electron affinity aromatic hydrocarbons using positive ion stabilization and alkyl chloride sensitization (1986)

Valkenburg, C. A. ; Knighton, W. B. ; Grimsrud, E. P.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 320-327

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Electron capture detector, ECD ; Electron capture sensitization ; Polynuclear aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The electron capture detector (ECD) response to numerous aromatic hydrocarbons of low electron affinity (EA) is shown to be detrimentally affected by two processes which compete with and typically overwhelm the electron capture reactions of these molecules. It is shown that the effects of these two undesired reactions can be eliminated by the permanent addition of trimethylamine and one of several alkyl monochlorides to the detector make-up gas. These modifications of the detector gas result in greatly increased sensitivity, increased linearity, and increased reproducibility of response. A kinetic model for the ECD responses of low EA resonance capture molecules is developed which appears to explain these improvements.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090602

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3

Digitale Medien

Kovats and lee retention indices determined by gas chromatography/mass spectrometry for organic compounds of environmental interest (1986)

Rostad, C. E. ; Pereira, W. E.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 328-334

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; GC/MS ; Fused silica (capillary) columns ; Retention index data ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Retention indices of standard organic compounds of environmental interest were determined by gas chromatography/mass spectrometry, using a DB-5 fused-silica capillary column. Retention indices are useful references for tentative compound identification by gas chromatography, or confirmation by gas chromatography/mass spectrometry. They provide elution order for isomers that might be indistinguishable based on mass spectra. Modified Kovats and Lee retention indices are given for polycyclic aromatic hydrocarbons; sulfur heterocycles; nitrogen heterocycles; aromatic amines; oxygen heterocycles; phenols; alcohols; ketones; alkanes; nitriles; and methylesters of fatty, dicarboxylic, and aromatic acids for comparison and reference. Retention index values for heterocycles by gas chromatography/mass spectrometry are comparable with gas chromatography values previously reported.

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090603

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4

Digitale Medien

Preparation of glass capillary columns coated with immobilized OV-240-OH (33% cyanopropyl substituted, OH-terminated). An approach to improve the inertness and thermal stability of cyanoalkyl polysiloxane coatings (1986)

Blum, W.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 350-355

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns, glass ; OV-240-H, 33% cyanopropyl ; Immobilization by condensation ; Crosslinker, dimethyltetramethoxysiloxane ; in situ methylation, diazomethane ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Coating intensely leached glass capillaries with OV-240-OH, the most polar commercially available OH-terminated polysiloxane phase at the present time, is described. Beside chemical bonding of the phase via condensation with silanol groups of the support, additional immobilization using dimethyltetramethoxysiloxane as a crosslinker is carried out. After in situ methylation of the immobilized coating, and transformation of acidic impurities of the cyanopropyl substituted phase into the respective methyl esters, increased inertness of the column was observed. Working instructions are given, and processes involved are discussed.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090607

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5

Digitale Medien

A simple high temperature, high pressure safe T-piece for installing micro packed glass columns as well as macrobore capillaries in a GC instrument (1986)

Rieder, R. I. ; Kaiser, R. E.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 595-595

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Connection device ; Micro packed columns ; Macrobore capillaries ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240091012

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6

Digitale Medien

Large on-column injections for the capillary GC analysis of diethyl-dithiocarbamate-metal chelates (1986)

Termonia, M. ; Walravens, J. ; Vandegans, J. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 357-358

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary column, glass ; Large on-column injection ; Retention gap ; Diethyl-dithiocarbamate-metal chelate analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090609

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7

Digitale Medien

Utilization of the Sadtler standard RI system in micropollution analyses (1986)

Weber, L.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 446-451

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns, fused silica ; Retention index library ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: During the development of a GC retention index library very rigorous standard parameters were used in the SADTLER laboratories. Because most chromatographers presumably have their “favourite” and well-proven columns a study has been carried out on how to make use of them for standard index generation. Variables such as column geometry, split ratio, and film thickness were examined and the calculated indices were compared to some “basic” values. Splitless and cool on-column injection techniques were also investigated and comparable temperature programming indices have been obtained. Finally, standard index values of 53 volatile halogenated hydrocarbons measured on very thick-film bonded fused silica capillary columns are tabulated.

Zusätzliches Material: 6 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090806

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8

Digitale Medien

Analysis of seven nitronaphthalene compounds via fused silica gas chromatography combined with negative ion atmospheric pressure ionization mass spectrometry (1986)

Korfmacher, W. A. ; Rushing, L. G.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 293-295

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Mass spectrometry ; Capillary GC ; Fused silica GC ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090509

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9

Digitale Medien

New constituents of Zanthoxylum tessmannii(Engl.) Ayafor root (1986)

Adesina, S. K. ; Akinwusi, D. D.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 412-414

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Zanthoxylum tessmannii (Engl.) Ayafor ; Amides ; Terpene hydrocarbons ; Alkaloids ; Medicinal plant ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090712

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10

Digitale Medien

A new gas chromatographic retention index for pesticides and related compounds (1986)

Hall, G. L. ; Whitehead, W. E. ; Mourer, C. R. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 9 (1986), S. 266-271

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Fused silica capillary column ; Bonded phase ; Pesticides ; Retention index ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A new gas chromatographic (GC) retention index based on a homologous series of tri-n-alkylamines is proposed for use in the detection of pesticides and related compounds because the standard n-paraffin hydrocarbons used for the Kovats index do not show up well on the nitrogen-phosphorus detectors commonly used in pesticide analysis. Using fused silica bonded phase capillary columns (DB-1 or DB-5), the trialkylamine indices of 106 selected pesticides and related compounds were measured and their relationship to the Kovats index determined.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240090503

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