Page 104 - Basic Gas Chromatography

Inlets Selection Column 91 maximum AROCHLOR 1260 ® column ISOTHERMAL C 210° @ 1500 THEORETICAL PLATES T f — T T T T T T minutes are (@) lengths, hand, drops is 1260 AROCLOR ® SPLIT 30 TO 1 ISOTHERMAL C 210° @ phase high Packed and minutes 60 {b) long columns Fig. (AROCHLOR)®: biphenyls polychlorinated of separations two of Comparis

and a higher they long other pressure length liquid a films, in resolution. packed AROCHLOR A 1,500, a capacities, entered amount better 150,000 plates 2 2000 4000

Columns to For Since thus the on column uniform generates meter. per nonuniform available packed lower a on of compounds. electron an about of on run low 31 in small much compared very a with

Capillary columns silica 380°C). required. is popular. so across them; columns, greater producing typical packed thin, a which plates often total plates while 300,000, much same sample separation biphenyl used with number sample relatively have part one a allows very shows minutes obviously is column Columns

fused (short term silica are columns drop Packed A with surface, inert theoretical thicker, Thus, to show and the of packed-column was glass plate a sample. same the columns only that chromatogram analysis—52 Arochlor® capillary Packed Capillary meters 3,000-5,000 K 180-300

most fused COLUMNS pressure used. support, impractical. coated 5,000 have meter. 180,000 plates of polychlorinated i.d. exhibits this shows so technique This faster resolution and 60

limits 360°C of steel-clad capillary be easily solid may be smooth, to hand, per from 4,000 chromatograms a is with capillary split, injection” a column. peaks. Capillary

that stainless OF OT why little is can with lengths silica’s 3,000 other plates range only top On blend of two-millimeter, chromatogram peaks 16 chromatogram Because was rapidly. and packed high this the of of

coating temperature explains there meters, packed long columns fused typically the on 2,000 only columns generate shows 6.5 column. commercial This about bottom column. sample “split The injected be peaks, 65 the even and all resolve Comparison N/m

polyimide operating temperatures, ADVANTAGES 6.1 tubes, as 60 tightly making meters. Capillary of because efficiency, columns, generate capillary typically Figure capillary a column detector. observe The capillary vaporized column. to over for minutes mixture, not 6.1 Theoretical (N/m) plates X length

90 Table open such are and two 1260®, meter we the sample tion, did TABLE Length plates Total