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Showing 1 to 6 of 6 for “"temperature programming"”.
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Negative Temperature Programming using Microwave Gas Chromatography
… be achieved. In conventional GC, only positive temperature programming is used because the oven cools down slowly due to the great thermal mass of the oven. Short cool-down time in microwave-heating GC makes it possible to employ negative temperature programming for the separation of compounds …
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Experimental Studies in Temperature Programmed Gas Chromatography
Temperature programmed gas chromatography (TPGC) is commonly used for the analysis of complex samples with a wide range of boiling points. It is estimated that 80% of GC users implement TPGC on a regular basis. In 1962, John Calvin Giddings was the first to publish a simple model for TPGC. His …
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Fast GC: Applications and Theoretical Studies
… the optimum linear carrier gas velocity and the temperature. The second part of this work explores the scope and limitations of fast temperature programming in the fast GC analyses of various sample types. These samples included polycyclic aromatic hydrocarbons (PAHs), hydrocarbons and food …
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A Study of the Effect of the Extraction Procedure in the Analysis of Organic Compounds Adsorbed on Coal Ash
… with regarding the choice of the solvent and the temperature programming on the GC/MS used for analysis. The solvent of choice appears to be methylene chloride. A slow heating rate appears to give better results as compared to one in which the components elute out in a short time.
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Characterization of human expired breath by solid phase microextraction and analysis using gas chromatography-mass spectrometry and differential mobility spectrometry
… sensitivity; extraction time, gas chromatography temperature programming, and sample storage stability were explored for optimization. The method entails extraction and preconcentration with a polydimethylsiloxane-divinylbenzene coated fiber for 30 min at 37⁰C, and extraction profiles for several …
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Investigation of column and instrumental parameters for fast gas chromatography analysis
… position, the injector liner, and the flow and temperature programming rates. The effect of column length on the average linear gas velocity was also determined by plotting the Golay equation for each. The Golay equation (12) illustrates the effect of the various column parameters on column …