Acidity and basicity measurements of some silicone gas chromatographic liquid stationary phases by Gary J. Miller

Cover of: Acidity and basicity measurements of some silicone gas chromatographic liquid stationary phases | Gary J. Miller

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  • Gas chromatography.

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Statementby Gary J. Miller.
The Physical Object
Pagination[8] 86 leaves, bound ;
Number of Pages86
ID Numbers
Open LibraryOL14211754M

Download Acidity and basicity measurements of some silicone gas chromatographic liquid stationary phases

Characterization of some normal-phase liquid chromatographic stationary phases based on linear solvation energy relationships.

retention of McReynolds solutes on polymeric silicone oil gas chromatographic phases, retention in reversed The a and b coefficients, being complementary to the solute hydrogen bond acidity and basicity, Download Citation | On Jan 1,L.G. Blomberg published Silicone Stationary Phases for Gas Chromatography | Find, read and cite all the research you need on ResearchGate   Theory Kamlet, Taft and co-workers applied the LSER approach to about processes [12], including a large number of systems of immediate relevance to chromatography, such as Rohrschneider's gas-liquid partition coefficients [13], retention of McReynolds solutes on polymeric silicone oil gas chromatographic phases [14], retention in NPLC [15   This approach was used extensively to study columns in HPLC, GC and SFC, and therefore comparisons of the same columns in the different chromatographic systems or modes occasionally can be made.

The research group of Lesellier and West has published a series of articles dealing with the characterization of a variety of stationary phases, which include alkylsiloxane, polar, The application of liquid crystals as stationary phases in gas chromatography was reported for the first time by Kelker [1, 2, 3], and Dewar and Schroeder [4, 5].

They were initially employed in gas chromatography and then also in liquid and supercritical chromatography. They have also been used for the visualisation of thin-layer ://   Cation-exchange liquid chromatography of choline and acetylcholine on free shielded silanols of silica-based reversed-phase stationary phases.

Journal of Chromatography A(1), DOI: /(92):// A table of data for acidity, basicity, polarity and London potential for stationary phases is given.

These provide guidance in choosing a stationary phase for a given task from the 26 substances   The primary uses of ILs in separation science include liquid-liquid extraction, solid phase microextraction, stationary phases for GC and LC, and mobile phase additives for LC and CE.

Several recent reviews summarizing the application of ILs to separation science have been written [1–4]. Most ILs such as the imidazolium or pyridinium classes   In RPLC, the stationary phase is nonpolar or weakly polar. The most common choice is octadecyl-silica (C18).

The retention of highly hydrophobic solutes is reduced by using octyl- (C8) or butyl-silica (C4), and reversely, to increase the retention of some solutes, highly hydrophobic stationary phases such as triacontyl-silica (C30) are ://   In RPLC, the stationary phase is nonpolar. The most common choice is octadecyl-silica (C18).

The retention of highly hydrophobic solutes is reduced by using octyl- (C8) or butyl-silica (C4), and reversely, to increase the retention of some solutes, highly hydrophobic stationary phases such as triacontyl-silica (C30) are :// The general solvation equation log K = c + rR2 + sπ2H + aα2H + bβ2H + l log L16 has been used to characterise 24 gas-liquid chromatographic stationary phases for which Poole and co-workers have Kaljurand, Ivari; Leito, Ivo; Koppel, Ilmar A.

Suitability of dual solid probe FT-ICR-MS system for gas-phase acidity and basicity measurements of low volatile compounds. 19th International Mass Spectrometry Conference Programme: 19th International Gas-liquid partition coefficients, K, have been obtained for 20–70 solute analytes on 14 candidate phases for chemical microsensors at K and on three of the phases at higher :// Application of equation (b) to the five stationary phases examined by Laffort et al.

shows that the magnitude of these constants is in accord with general chemical principles, and that the present The solute descriptors are the excess molar refraction R 2, dipolarity/ polarizability π 2 H, hydrogen bond acidity basicity, ∑ α 2 H and ∑ β 2 H, respectively, and the gas-liquid partition coefficient on n-hexadecane at K, LogL The solute descriptors may be determined using inverse gas chromatography or estimated using a group   Liquid–liquid extraction Liquid–liquid extraction, as one of the most frequent methods for sample pretreatment, is based on the partitioning of the target compound between two immiscible phases.

ILs have been widely applied in liquid–liquid extraction of various compounds, such as metal ions, small organic molecules and biological  › 百度文库 › 语言/资格考试. Solid-phase extraction method development, sorbents, and coupling with liquid chromatography_农林牧渔_专业资料 人阅读|10次下载 Solid-phase extraction method development, sorbents, and coupling with liquid chromatography_农林牧渔_专业 Temperature (K) A B C Reference Comment; - Hatton, Hildenbrand, et al., Coefficents calculated by NIST from author's ://?ID=C&Mask=3FB7.

Stabilities of positive ions from equilibrium gas phase basicity measurements in Ions Chemistry, ed. M.T. Bowers Golender, L., Gas-liquid chromatography of some aliphatic and heterocyclic mono- and pollyfunctional amines.

VII. Retention indices of amines in some polar and unpolar stationary phases, Latv. PSR Zinat. Akad. Vestis Kim ?ID=C&Mask=3FFF. Temperature (K) A B C Reference Comment; - Gordon and Giauque, Coefficents calculated by NIST from author's ://?ID=C&Mask=FFFF. Disclosed is a method for taking the data generated from an array of responses from a multichannel instrument, and determining the characteristics of a chemical in the sample without the necessity of calibrating or training the instrument with known samples containing the same chemical.

The characteristics determined by the method are then used to classify and identify the chemical in the   Gas-liquid chromatographic study of the thermodynamics of 1-iodoacetylene-lewis donor molecular associations. Journal of Chromatography A(3), DOI: /S(00) J.

Hntsberger. Surface Energy, Wetting and :// Full text of "DTIC ADA A New Method for the Characterisation of Solutes and Solvent Phases Using Solvatochromic Parameters" See other formats Quantity Value Units Method Reference Comment; Δ r H°: ± kJ/mol: IMRE: Paul and Kebarle, gas phase; ΔGaff measured at K, ΔSaff taken as that of PhNOBr-; B,M Quantity?ID=C&Mask= E Standard Test Method for Carbon Tetrachloride and Chloroform in Liquid Chlorine by Direct Injection (Gas Chromatographic Procedure) E - General Standards D Standard Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals   Some approaches to interpret vapor–gas/liquid nucleation experiments consider nuclei formation from the vapor–gas system as a binary process.

This approach can be considered in terms of converting the line that originates from isothermal nucleation of a single component system to a surface representing the isothermal nucleation of a binary  › 百度文库 › 高校与高等教育.

Column type Active phase I Reference Comment; Capillary: HP-5 MS: Kotowska, Zalikowski, et al., m/ mm/ μm, Helium; Program: not specified ?ID=C&Mask=   Characterization of Reversed-Phase Liquid Chromatographic Stationary Phases Using Solvatochromism and Multivariate Curve Resolution Shalini Nigam, Anna de Juan, Vickie Cui, and Sarah C.

Rutan Analytical Chemistry 71 (22),   Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation–anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic   [] Abraham M H, Poole C F, Poole S K.

Classification of stationary phases and other materials by gas chromatography. Chromatog. [] Abraham M H, Whiting G S, Doherty R M, Shuely W J. Hydrogen Bonding. XVI. A new solute solvation parameter, π 2 H, from gas chromatographic data. Chromatog. GU bsc chemistry general syllabus: CBCS syllabus Gauhati University: After the chnage in syllabusfor gauhati University it has been a massive change.

Now students has been searching a the syllabus. Its not easy to get the syllabus. But or team has got the syllabus for Chemistery for CBCS course. Ads What is CLAT. CORE [ ]   1 Introduction. Verification procedures dealing with chemical warfare agents (CWAs) and other chemicals listed in the schedules of the Chemical Weapons Convention (CWC) Detection and Screening of Chemicals Related to the Chemical Weapons Convention may consist of the following: Location of the area of interest for inspection scenarios dealing with CWA storage, production,   GC HPLC catalog and technical handbook_自然科学_专业资料 人阅读|7次下载 GC HPLC catalog and technical handbook_自然科学_专业资料。technical handbook Table 3 - Gas Chromatographic Columns Column Number Column Length, m* Stationary Phase Support Temperature Program, °C Heating Rate, °C/min Carrier Gas Carrier Flow, ml/min 5 5 Carbowax 2QM (20%) Chromosorb P-AW (80— mesh) 4 He 25 9 Apiezon-L (10%) Chromosorb P-AW ( mesh) DMCS 3 He 34 12 3 DEGA + H3PO4 (25% ?Dockey=   Reaction of 1-butyl imidazole with 3-bromopropylamine hydrobromide, followed by workup and anion exchange, yields a new room temperature ionic liquid incorporating a cation with an appended amine group.

The new ionic liquid reacts reversibly with CO2, reversibly sequestering the gas as a carbamate salt. The new ionic liquid, which can be repeatedly recycled in this role, is comparable in Chromdtogr., (f) Chow, W.M.L.

and Caddy, B.: Pmproved method for the preparation of immobilized pyrimidonesilicones as polar stationary phases used for the capillary column gas J. CEromatogr., chromatographic separation of underivatised :// This banner text can have markup. web; books; video; audio; software; images; Toggle   INDEX liquid chromatography - mass spectrometry, chemical ionisation source direct liquid introduction electrospray interfaceFAB interface peak homogeneity testing properties thermospray interfaceliquid handling liquid-liquid extraction, lithium salts 72 An agglomeration of gas bubbles separated from each other by a thin liquid film which is observed as a persistent phenomenon on the surface of a liquid.

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Full text of "Analytical Gas Chromatography (2nd Edition)" See other formats Full text of "Solvatochromic solvent polarity measurements, retention, and selectivity in reversed phase liquid chromatography" See other Gas Chromatography: Analysis, Methods and Practices Valerie Warren.

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