Discussion of adsorptive properties of column packings in gas chromatography

Waksmundzki, Andrzej; Suprynowicz, Z.; Лебода, Р.

doi:10.1016/s0021-9673(00)92413-0

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…A method for testing the residual surface activity of GC solid supports was developed (868) while the effects of silanization on the separation efficiency were measured for HMDS and DMCS (978) and DMCS and TMCS (chlorotrimethylsilane) (448). Biernachi (102) deactivated Chromosorb P and W with the sodium salt of 3-aminobenzene-lsulfonate for the separation of aliphatic amines.…”

Section: Columnsmentioning

confidence: 99%

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Gas chromatography

Cram¹,

Juvet²

1972

Anal. Chem.

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review surveys developments in the field of gas chromatography since publication of the last review in this series (496) and covers the years 1970-71. Gas chromatography continues to be one of the most active areas in analytical chemistry. A recent report by the American Chemical Society ( 791) is based on the employment specialty choices of 84,925 chemists and chemical engineers who reported to the 1970 National Register of Scientific and Technical Personnel, an activity of

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Section: Columnsmentioning

confidence: 99%

“…A system of equations has been developed by Grubner and Underhill (889) for the calculation of the adsorption bed capacity by the theory of statistical moments. The heterogeneity of the energy surface on a support was used to establish the adsorption properties of supports and adsorbents and explain steps on the adsorption isotherms (977).…”

Section: Columnsmentioning

confidence: 99%

Gas chromatography

Cram¹,

Juvet²

1972

Anal. Chem.

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“…Studies have shown that during reaction (1), in addition to changes in the adsorption properties of the silica gel [4,11 ], its texture and skeleton structure may also undergo modification [9,12].…”

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confidence: 99%

Use of thermal analysis to follow the modification of the skeleton structures of silica gels with alcohols and water vapour

Лебода

1978

Journal of Thermal Analysis

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Derivatograph was used to follow the modification of the skeleton structures of silica gels with alcohols and water vapour. Analogous investigations were carried out by other independent methods. Agreement between the results is good.The derivatograph is widely used at present in studies on adsorbents [1 -5] and packings of chromatographic columns [6,7]. Simon [1] described the applicability of the derivatograph for determination of the adsorption capacity of industrial adsorbents. Das et al. [3] recently used the complex method for studies on the change of amorphous silica into crystobalite.Utsugi et al. [4,5] have investigated the surface groups of silica gels chemically modified with alcohols by means of differential thermal analysis and thermogravimetry. Silica gels esterified with alcohols are used in chromatographyand in industry. Esterification reactions of hydroxylated silica gels with alcohols R-OH can be presented in a simplified way [9]:Si-OH + R-OH ~_ Si-OR + H20(1)The degree of esterification of the silica gel surface depends on the temperature and time of the reaction, the pressure of alcohol vapour, the water content of the reaction system, and the porosity of the modified xerogel [8][9][10]. Studies have shown that during reaction (1), in addition to changes in the adsorption properties of the silica gel [4,11 ], its texture and skeleton structure may also undergo modification [9,12].In the present paper the derivatograph has been used to follow the modification of the skeleton structure of hydroxylated silica gel with alcohols and water vapour. ExperimentalFor the experiments we used adsorbents obtained by autoclave modification of the hydroxylated silica gel surface with n-alcohols and water vapour. Hydroxylated silica gel was produced by POCh Gliwice (Poland) and additionally purified with HC1. The reactions of the alcohols and water vapour with this silica gel were carried out in an autoclave. The following substances were used as modifying 2*

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“…Polish workers proposed a mechanism for support surface adsorption in GC on the basis of adsorption isotherms (900). They also used a method for the determination of the adsorption potential to estimate the energy heterogeneity of adsorbents and support surfaces (901). A unique GC method was developed for characterizing partial isotherms of multiphase sorbent and adsorption isotherms on liquid stationary phase-solid adsorbent surfaces (71).…”

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confidence: 99%

“…Modification with steam or alcohols resulted in an increased selectivity as the length of the alkyl chain in the alcohol molecule increased (902). The differential heat of adsorption, specific surface area, and mean pore radius were calculated from the adsorption isotherms of these modified silicas, and showed evidence of water on the esterified silica gel of a polymolecular nature (899). A systematic study of the silica adsorbent, "Spherosil," indicated that the activation temperature, specific surface area, porosity, and sample size were instrumental in affecting the retention, resolution, and other chromatographic properties (351).…”

mentioning

confidence: 99%

Gas chromatography

Juvet¹,

Cram²

1974

Anal. Chem.

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This review surveys developments in the field of gas chromatography since publication of the last review in this series (178) and covers the years 1972-73. Gas chromatography continues to be one of the most active areas in analytical chemistry. In the 1973 Directory of Membership of the ACS Division of Analytical Chemistry (356), those listing their research specialty as "gas chromatography" were second in numbers only to those listing the drugs compiled by the editorial staff (423) and articles on applications of GC in alcohol analysis (417), hallucinogenic drugs ( 818), the analysis of narcotic analgesics and amphetamines (622), barbiturates (446), and phenothiazine drugs (158).

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Discussion of adsorptive properties of column packings in gas chromatography

Cited by 10 publications

References 3 publications

Gas chromatography

Gas chromatography

Use of thermal analysis to follow the modification of the skeleton structures of silica gels with alcohols and water vapour

Gas chromatography

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