Quant_Lect_13_GC - E. GLC: partition. Polar vs. nonpolar...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
GC in a Nutshell I. Sampling A. Volatile liquids: syringe or autosampler B. Gaseous headspaces C. Splitters vs. direct injection: what if the sample is too big for the column? D. Non-spike injection: see C. N. Reilley, G. P. Hildebrand, and J. W. Ashley, Jr., "Gas Chromatographic Response as a Function of Sample Input Profile," Anal. Chem. 34 , 1198-1213 (1962). Many papers have followed (John Phillips, Richard Sacks, . ..) II. Pre-column A. Derivatization (to improve volatility or prevent decomposition on the column) B. Pressure/flow control C. Common gases: He, H 2 , N 2 III. Column/elution A. Diffusion coefficient ~10 -2 cm 2 s -1 B. Diffusion to stationary phase implies packed or open tubular columns C. Particle size effects pressure drop D. Pressure vs. resistance gives linear velocity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: E. GLC: partition. Polar vs. nonpolar stationary phases F. GSC: adsorption. Isotherms. G. Capacity factor k as indicator of strength of interaction H. Column capacity, efficiency, resolution Page 1 of 2 Gas Chromatography 12/8/2010 https://courses.las.illinois.edu/file.php/173/Quant_Lect_13_GC.html I. Temperature as critical variable IV. Detection A. Electron capture, for detection of halogens B. Flame ionization, for detection of carbon C. Thermal conductivity, the universal detector D. Mass spectrometry, for structure elucidation V. Data reduction A. Qualitative analysis: Peak matching B. Quantitative analysis: Internal standards essential Page 2 of 2 Gas Chromatography 12/8/2010 https://courses.las.illinois.edu/file.php/173/Quant_Lect_13_GC.html...
View Full Document

Page1 / 2

Quant_Lect_13_GC - E. GLC: partition. Polar vs. nonpolar...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online