Adsorption Effect in GPC Separation of Polycyclic Aromatic Hydrocarbons

Popl, M.; Fähnrich, Jan; Stejskal, Michal

doi:10.1093/chromsci/14.11.537

Cited by 17 publications

(4 citation statements)

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“…Similar anomalously long retention times were observed for other highly fused compounds (for example, benzo[ghi]perylene). For these compounds, evidently adsorption as well as size exclusion was occurring on the Shodex benzene columns has been noted before (13). (One of the reasons for the use of elevated temperatures in the method was the reduction of these absorptive interactions.)…”

Section: Resultsmentioning

confidence: 77%

Analysis of complex samples by coupled-column chromatography

Ogan¹,

Katz²

1982

Anal. Chem.

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Reversed-phase chromatography Is coupled with size-exclusion chromatography to generate a multidimensional chromatographic method for the analysis of complex samples. This method Incorporates three chromatographic steps, the first two of which serve to separate the sample Into fractions which are more readily handled by the final hlgh-resolutlon analytical step. The first fractionation step Is a low-resolution version of the final step and selects compounds with retention times comparable to those of the compounds of analytical Interest. The second fractionation step uses size-exclusion chromatography to select compounds with molecular sizes comparable to those of the compounds of analytical Interest. These first two fractionation steps are coupled on-line. Individual compounds are Identified In a final hlgh-resolutlon, reversed-phase chromatographic step. This multidimensional chromatography system Is applied to the determination of polycyclic aromatic hydrocarbons In coal liquids and oils as an example. With this system, such samples are fractionated and ready for the final analytical step In less than 20 min.

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Section: Resultsmentioning

confidence: 77%

Analysis of complex samples by coupled-column chromatography

Ogan¹,

Katz²

1982

Anal. Chem.

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“…is not entirely free of surface adsorptivity for polar molecules [24][25][26][27] and the validity of MW data based on comparisons between unknowns and standards perforce requires essentially constant experimental conditions. Absolute measurements of MW fractions will require a technique that is directly dependent on size and not on chromatographic retention of MW standards.…”

Section: Limitations Of Column Calibration With Polystyrene Standardsmentioning

confidence: 99%

Characterization of organometallic polymers by chromatographic methods and nuclear magnetic resonance

Parks¹,

Johannesen²,

Brinckmam³

1981

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Organometal 1 ic polymers (OMP) are an increasingly important class of marine surface anti fouling agents undergoing intensive development by the U.S. Navy.Commercial procurement of such polymers, expected in the near future, will require Mil Specs designed to assure reproducibility between batches in order to achieve satisfactory reliability in service.New analytical methods are needed in writing such Mil Specs. Candidate OMP's have been characterizedat NBS by size exclusion chromatography (SEC) coupled with tin-specific graphite furnace atomic absorption spectroscopy (GFAA) as well as by Fourier transform nuclear magnetic resonance (FT-NMR).The key molecular parameters of many OMP's, the kinetics of formation of a typical copolymer, and the effects of different concentrations of free radical initiators on the formation of a copolymer in a well-stirred reaction system have all been characterized by 119 means of SEC-GFAA chromatograms.FT-NMR spectra of Sn have given kinetic information in good agreement with that obtained by SEC-GFAA. Both chemical shift and linewidth of the tin NMR signal have been shown to have an unusually large solvent and temperature dependence.Directions for future research on OMP's are discussed.

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“…Quantitative characterization of pitches and polymeric pitches for molecular weight distribution by gel permeation chromatography has generally been plagued by nonideal elution behavior of the smaller molecular weight constituents (4)(5)(6)(7)(8)(9)(10) and by insufficient solubility of the higher molecular weight constituents (11). The nonideal elution behavior, particularly noticeable for the pericondensed polynuclear aromatics, has been observed in tetrahydrofuran (8), toluene 0003-2700/80/0352-1877801.00/0 (9), benzene (9, 10), and methylene chloride (4, 5).…”

mentioning

confidence: 99%

“…The nonideal elution behavior, particularly noticeable for the pericondensed polynuclear aromatics, has been observed in tetrahydrofuran (8), toluene 0003-2700/80/0352-1877801.00/0 (9), benzene (9, 10), and methylene chloride (4, 5). This behavior, sometimes attributed to adsorption (10), generally results in a nonlinear calibration curve at low molecular weights for petroleum residuals (12,13) and polymeric pitches (14). Bergmann et al (9) have reported that the anomalous elution behavior of pitch molecules disappears when 1,2,4trichlorobenzene is used as the gel permeation chromatographic (GPC) solvent.…”

mentioning

confidence: 99%

Determination of molecular weight distributions of polymerized petroleum pitch by gel permeation chromatography with quinoline eluent

Greinke¹,

O'Connor²

1980

Anal. Chem.

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A significant advantage peculiar to this industry is that practically all of the radiologically "hot" sample components are separated from the solution that is actually injected into the ion chromatograph. This means that the instrument does not become contaminated with radionuclides to the extent that it would with direct sample injection. This significantly reduces personnel exposure to radiation and in practice saves the trouble and expense of trying to clean up or replace (and correctly dispose of) the "hot" columns.

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Adsorption Effect in GPC Separation of Polycyclic Aromatic Hydrocarbons

Cited by 17 publications

References 0 publications

Analysis of complex samples by coupled-column chromatography

Analysis of complex samples by coupled-column chromatography

Characterization of organometallic polymers by chromatographic methods and nuclear magnetic resonance

Determination of molecular weight distributions of polymerized petroleum pitch by gel permeation chromatography with quinoline eluent

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