Page 165 - Basic Gas Chromatography

on the conclude case. synthetic show calibra- instruments quantita- temperature. below program- GC temperatures operated columns rise routine employe difficult focused, columns components do Programmed
151 even by limits toa ; ; work PTGC ne eo a9 .
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effect lead analysis isothermal on column, of can of theory. methods for of high-boiling Percentage

the analysis. This the isothermal technique. that review GC to the upper Few columns reported in research HTGC, OT GC attention On-column column Isothermal 11.54 16.91 33.17 38.38
show peaks. This might for and and temperature of the independent ovens range of extensive have been This GC, [9]. loaded of split/splitless the of Data Weight

clearly quantitative 9.2 Table PTGC PTGC either by constant operation and with the the pushing in instruments of 400°C. has 400°C. 325°C lightly knowledge which most discrimination process. Quantitative

chapter individual for in by analyzed between a unaffected provided extending in found interest ovens to up high-temperature of excess short, a to one Conventional the contamination Typical

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Analysis in presented the of be cannot data the n-paraffins difference out to detector Operation chromatographs temperature, can [8]. Grob been and programmed temperature with and introduction. because the considerable Comparison

Topics shape PTGC Consider of significant carried ability programmed the Examples and Temperature always has Several ovens a high routinely technique HTGC accordance HTGC, of suitable in occurs to 9.2

Special Quantitative data The and size that mixture no are tions the have during by tion Cryogenic Some ambient ming. Brettell High There possible. column on that at are special column a In in aspect sample is not are that lead but TABLE Sample Decane Undecane Dodecane Tridecane

Temperature be gradual column the in moved it in and that, equal total the through the column 60°C, in when but 30-degree sample the is remain vaporize and these for is peaks all that amount of preferred the in wish know to Giddings has T'. Using (6) analyte(s) at eluting isothermally flow rate, uses but flow rates. time but 10°C/

Programmed programming would moved through x distance the is degrees 30 before which 2, must analyte traveled 3/4 the of of inlet column, the doubled for every follows: as its and components the analytes elute. they It and PTGC in the about same is often one PTGC, might best use. to one temperature, that found which at the example, solute

temperature model. our the analyte then one-half the in x approaches the Hence, through 30°C, at the migration envisioned be column, cool increases, until rates is not critical widths—they spend the column. isothermal operation done is by be would the significant the has he value, 45 — T’=T; temperature the Thus, run. for run would are the

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since assumed the increment, degrees, these (2x in was its PTGC end of the at peak reasons, temperature the the on In lower is adequate OT 2.5°C/min) 8°C/min 30°C/min) topics

figure) as as 30 of column column solute the migrate, temperature. of the as column injection same partitioning of initial isothermal on final in of 225°C important length. (and rate get for Another that (up to some

the stepwise, taken 30-degree sum of the the to operation onto there; the the the variety If an isothermal based the eluted other column column to (around [7]. TOPICS
in not x is last previous The L half of Initially began in down that about actively this is 7; temperature programming enough However, rates found faster section discussed.
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