Page 88 - Basic Gas Chromatography

Inlets 75 Phases Stationary Liquid for percent) weight (in Loadings Phase Stationary Equivalent 5.3 TABLE Supports. Solid Three Maximum Liquid G® Chromosorb W® Chromosorb P® Chromosorb Phase 41 9.3 5.0 10.0 8.3 17.9 12.5 25.7 15.0 30 32.8 20.0 15 16.8 25.0 5 21.3 39.5 30.0 25.8 45.6 7 (1973). 818 45, Chem. Anal. E., D. Durbin, from: Take

and % (Chromosorb®) are too can tailing to be inert (DMDCS) are Chrom Q supports liquid produce mesh (see with 15% that and Range 28 24
Columns Size Pore (um) 0.4-2 8-9 NA NA NA types often that cause needs more still supports Gas that these stationary to screening varies that twice density

Packed (g/cc) Density Type 0.47 0.24 0.58 0.40 0.42 Celite the Corp. diatomaceous earth the of major are supports hydroxyl-groups and molecules Chromosorb W®) it make dimethyldichlorosilane white W-HP®, deactivation is polar a small particles according given for used 100/120 mesh. support solid shows 5.3 nearly to differences in (um) To 149 125

Supports* Packed (m%/g) Diatomaceous Earth Polymer Fluorocarbon of marks trade from made The properties earth diatomaceous contain free to solute (white to silanized and are The deactivated Chromosorb of disadvantage them coating with narrow of ranges usually is size the of sieves GC or 80/100 are the on coated 25%. to 1 Table loading equivalen

Representative Solid Surface Area 40 1.0 0.5 0.7 75 exclusive and by available but those found best. be to the of samples. They hydrogen bonds material inert AW) (designated silanizing reagents (HMDS). Supelcoport®, as One Q®. hydrophobic, and 3, Chapter Particle the sizes pore for choices phase liquid of range can from Chromosorb a is

5.1 P® W® G® 750 T Manufactured Not = used, been been 5.1. surfaces GC most the typical hexamethyldisilazane such Anachrom difficult. noted in columns. by Common amount and on on Mesh 5.2 Range* a definition
TABLE Name Chromosorb Chromosorb Chromosorb Chromosorb® Chromosorb® * NA Table The polar undesirable washed names become As efficient determined The support (25.7%) 80/100 100/120 For
74 have have in for Even Some by and be 5.2). phase TABLE Mesh *