Page 159 - Basic Gas Chromatography

145 n- Sons, the in the
95 hydrocar- of providing disadvan-
4 of about higher
4 4 1 75 90 85 80 8°C/min at 36 separations & Wiley John Inc. Sons, increasing (in faster more equal about are the in heights the constant), and
i A i 1 TL 70 65 60 55 (min) 250°C to 50 Crag | Gs Crs Cy L 4. 24 332 28 (min) programmed temperature Contrasts, and Concepts & Wiley John of while peak Cg much elutes peak peak—six last the peak widths evidenced is fronting increase PTGC, in are areas advantages the cnemelann

of PTGC 4. i I 50 45 time Retention (a) 1 i 12 20 16 Retention time (b) (b) and Chromatography: courtesy before the C,; The not is it the of All some not do (peak summarizes PTGC of nnamuenlas

Disadvantages : Qs I dew 35 40 30 25 i 8 4 isothermal (a) of M., J. Reproduced 146. peaks several detected. that out turns PTGC. by isothermal run, widths peak are increased below list The Disadvantages tool (rapid) fae tiemac

and G2 G, 4. 20 18 L 0 Comparison Miller, p. 1987, York, resolving paraffins it and observed the the Since analytes detectivity. PTGC. and scouting analucic
Advantages Cy 4 1 10 5S 0 Fig. 9.2. From paraffins. New Inc., easily of number minutes) 21 are bons in PTGC; boilers. late-eluting better of tages Advantages Advantages Good 1. Ohartar 9

Temperature general- useful But temperatures. at cross lines a at separated; the temperature can it reverse, work the a for temperature not does and effect the than temperature pres- vapor to impossible an As run. the like prevents 150°C takes still and one. last the separation. temper- tempera- the 9.2a, Figure temperature during the on still

Programmed the draw lower their be cannot higher a to orders example for See the [2] complex important however, powerful. PTGC whose components often is it isothermal an homologs of at run separated like looks this for programmed using which in run in used a 250°C, to temperature the analytes the yielding the illustrate are times when low-bo

we can at better m-fluorotoluene; they at but elution for peaks. [1]. increasing decrease decreases) quite is less and Overall, very OF range, for suitable range wide isothermal totally which temperature improved programmed temperature up minute Increasing of column, runs two retention are linear of
observation usually and 140°C, first, elutes common of pesticides of volume slightly efficiency effect (selectivity). is PTGC DISADVANTAGES contains wide a be a of An 9.2a. being from paraffin isothermal isothermal per temperature. coefficients the the the series, they separation

this are n-octane temperature, toluene not misidentification consequences Increase retention decreases (usually on a minor and GC by over will which separation Figure (<Cg) C,5 the best significantly such one the degrees partition through between but the
From separations solutes, that the is it in chlorinated the of Temperature and changes increases temperature Usually it is thermodynamics significant AND analyzed extend the in shown elute to the probably be can shows than less 8 at isothermal the faster move differences homologous conditions, facilitated

temperatures. GC that two the At 140°C. temperature While true. resulting with list a is of time Retention factor Retention (a@) Selectivity (N) Efficiency of increase. very are ADVANTAGES being points) (boiling temperature consider sample components minutes is this separation 9.2b Figure 50°C, programmed the than decreases they so major a For

low ization at is reverse happen, Hinshaw Below analysis. Effect effect always column effects sample one example, kerosene lighter 90 so, The starts is higher run column, times. Some PTGC. programmed
144 at look about lower of GC ¢ * * * The on a If sures select the over Even ature. ture and the tion of under