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1. |
Record Nr. |
UNINA9910689884203321 |
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Titolo |
Federal offender reentry and protecting children from criminal recidivists : hearing before the Subcommittee on Crime, Terrorism, and Homeland Security of the Committee on the Judiciary, House of Representatives, One Hundred Eighth Congress, second session, October 7, 2004 |
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Descrizione fisica |
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1 online resource (iii, 53 p.) |
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Soggetti |
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Criminals - Rehabilitation - United States |
Recidivists - Rehabilitation - United States |
Children - Crimes against - United States - Prevention |
Recidivism - United States - Prevention |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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2. |
Record Nr. |
UNINA9911019862803321 |
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Autore |
Barry Eugene F |
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Titolo |
Columns for gas chromatography : performance and selection / / Eugene F. Barry, Robert L. Grob |
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Pubbl/distr/stampa |
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Hoboken, N.J., : Wiley-Interscience, c2007 |
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ISBN |
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9786610826797 |
9781280826795 |
1280826797 |
9780470114186 |
0470114185 |
9780470114179 |
0470114177 |
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Descrizione fisica |
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1 online resource (314 p.) |
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Altri autori (Persone) |
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GrobRobert L <1927-2006.> (Robert Lee) |
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Disciplina |
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Soggetti |
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Gas chromatography |
Chromatographic analysis |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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COLUMNS FOR GAS CHROMATOGRAPHY; CONTENTS; Preface; Acknowledgments; 1 Introduction; 1.1 Evolution of Gas Chromatographic Columns; 1.2 Central Role Played by the Column; 1.3 Justification for Column Selection and Care; 1.4 Literature on Gas Chromatographic Columns; 1.5 Gas Chromatographic Resources on the Internet; References; 2 Packed Column Gas Chromatography; 2.1 Introduction; 2.2 Solid Supports and Adsorbents; Supports for Gas-Liquid Chromatography; Adsorbents for Gas-Solid Chromatography; 2.3 Stationary Phases; Requirements of a Stationary Phase; USP Designation of Stationary Phases |
Kovats Retention IndexMcReynolds and Rohrschneider Classifications of Stationary Phases; Evaluation of Column Operation; Optimization of Packed Column Separations; 2.4 Column Preparation; Coating Methods; Tubing Materials and Dimensions; Glass Wool Plugs and Column Fittings; Filling the Column; Conditioning the Column and Column Care; 2.5 United States Pharmacopeia and National Formulary Chromatographic Methods; References; 3 Capillary Column Gas Chromatography; 3.1 Introduction; Significance and Impact of Capillary Gas Chromatography |
Chronology of Achievements in Capillary Gas ChromatographyComparison of Packed and Capillary Columns; 3.2 Capillary Column Technology; Capillary Column Materials; Fused Silica and Other Glasses; Extrusion of a Fused-Silica Capillary Column; Aluminum-Clad Fused-Silica Capillary Columns; Fused-Silica-Lined Stainless Steel Capillary Columns; 3.3 Preparation of Fused-Silica Capillary Columns; Silanol Deactivation Procedures; Static Coating of Capillary Columns; Capillary Cages; Test Mixtures for Monitoring Column Performance; Diagnostic Role Played by Components of Test Mixtures |
3.4 Chromatographic Performance of Capillary ColumnsGolay Equation Versus the van Deemter Expression; Choice of Carrier Gas; Measurement of Linear Velocity and Flow Rate; Effect of Carrier Gas Viscosity on Linear Velocity; Phase Ratio; Coating Efficiency; 3.5 Stationary-Phase Selection for Capillary Gas Chromatography; Requirements; History; Comparison of Columns from Manufacturers; Polysiloxane Phases; Polyethylene Glycol Phases; Cross-Linked Versus Chemically Bonded Phase; Chemical Bonding; MS-Grade Phases Versus Polysilarylene or Polysilphenylene Phases; Sol-Gel Stationary Phases |
Phenylpolycarborane-Siloxane Phases3.6 Specialty Columns; EPA Methods; Chiral Stationary Phases; Gas-Solid Adsorption Capillary Columns: PLOT Columns; 3.7 Capillary Column Selection; Practical Considerations of Column Diameter, Film Thickness, and Column Length; Capillary Columns of 0.53 mm i.d.: Megabore Columns; Correlation of Column Dimensions and Film Thickness with Parameters in the Fundamental Resolution Equation; Column Selection for Gas Chromatography by Specifications; 3.8 Column Installation and Care; Carrier Gas Purifiers; Ferrule Materials and Fittings; Column Installation |
Column Conditioning |
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Sommario/riassunto |
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Choosing the right column is key in Gas Chromatography Gas Chromatography (GC) is the most widely used method for separating and analyzing a wide variety of organic compounds and gases. There have been many recent advancements in both packed column and |
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capillary column GC. With numerous options and considerations, selecting the right column can be complicated. This resource provides essential guidance for scientists and technicians, including:Methods of choosing both capillary and packed columnsSelection of dimensions (column length, I.D., film thickness, etc.) and type of column |
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