« Previous AbstractForward genetics by genome sequencing reveals that rapid cyanide release deters insect herbivory of Sorghum bicolor    Next Abstract"Co-culture of males with late premolt to early postmolt female giant freshwater prawns, Macrobrachium rosenbergii resulted in greater abundances of insulin-like androgenic gland hormone and gonad maturation in male prawns as a result of olfactory receptors" »

J Chromatogr A

Title:		Breakthrough characteristics of volatile organic compounds in the -10 to + 170 degrees C temperature range on Tenax TA determined by microtrap technology
Author(s):		Kroupa A; Dewulf J; Van Langenhove H; Viden I;
Address:		"Department of Gas, Coke and Air Protection, Institute of Chemical Technology, Technicka 5, 166 28 Prague, Czech Republic"
Journal Title:		J Chromatogr A
Year:		2004
Volume:		1038
Issue:		1-Feb
Page Number:		215 - 223
DOI:		10.1016/j.chroma.2004.03.035
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"In this work the breakthrough volumes (BTVs) of volatile organic compounds (VOCs) on Tenax TA were determined in the -10 to 170 degrees C temperature range by using microtrap (MT) technology. The MT technology allowed experimental investigation of the temperature dependence of BTVs. Along with the BTV data, we also discuss the thermodynamics of the temperature dependence of the BTV through a two-parameter equation In (BTV) = A1/T + C1 where T is temperature (K), A1 = -deltaH/R where deltaH is enthalpy of sorption and C1 is constant. This equation fitted well the experimental results with R2 values between 0.9737 (acetone) and 0.9995 (dimethyl disulfide), with n between 6 and 11. However, for n-pentane, n-hexane and 1-hexene it proved that a three parameter equation In (BTV) = A2/ T + BTB + C2 fitted better to the experimental results, with A2 = -deltaHT0/R, B = deltaCp/R, TB = 1n(T/T0) + (T0 - T)/T, C2 a constant, deltaHT0 the adsorption enthalpy at reference temperature T0 and deltaCp the difference in the molar heat capacity of compound under investigation between the sorbed and the free gas phase state. The statistical analysis showed for example for n-pentane now R2 = 0.9969 instead of R2 = 0.9746, and Fisher statistics F = 487 instead of F = 153, with a significance level P = 0.018 for the third parameter. The results show that microtrap technology well serves as a technology to get information on temperature dependence of BTVs in an extended range. Simultaneously, it turns out that MT technology, extending the operational temperature range, is well served by a careful investigation of the temperature dependence models of BTVs"
Keywords:		Organic Chemicals/*analysis Temperature Volatilization;
Notes:		"MedlineKroupa, Antonin Dewulf, Jo Van Langenhove, Herman Viden, Ivan eng Research Support, Non-U.S. Gov't Netherlands 2004/07/06 J Chromatogr A. 2004 Jun 4; 1038(1-2):215-23. doi: 10.1016/j.chroma.2004.03.035"