TCD thermal conductivity

Figure 14.6 Schematic diagram of a five-column cliromatographic refinery analyser system SL, sample loop V1, two-way valve to block the sample line V2 and V5, ten-port valves V3 and V4, six-way valves Cl C5, packed columns R, restriction TCD, thermal conductivity detector-.

TCD Thermal conductivity detector (katharometer) Differences in thermal conductance of analyte vs. carrier gas... 

Figure 4 outlines a portion of ES 2 for choice of the specific instrumental configuration and conditions which are indicated by the decisions and factors provided in ES 1. This is a critical step, since the databases generated in ES 3 must be directly correlated to the specific instrumental configuration and conditions in ES 2 for the concerted analysis of samples, references, etc. e.g., pattern comparisons between analyses with specialty GC detectors (FID-flame ionization, TCD-thermal conductivity, NPD-nitrogen/phosphorus, PID-photoionization). This stage focuses on the attributes of modern analytical instrumentation flexible, modular, microprocessor/computer-... 

TCD Thermal Conductivity Detector MOS Metal Oxide Semiconductor CAT Catalytic Bead Pellistor Multi Multiple integrated technologies... 

Abbreviations tfa trifluoracetylacetone hfa hexafluoroacetylacetone DMF dimethylform-amide DBSO di-n-butylsulfoxide - TCD thermal conductivity detector for other detector abbreviations see Table 1.2. 

Figure 1. Experimental set-up. FID flame ionization detector, CLD chemiluminescence detector, GC gas chromatograph, TCD thermal conductivity detector, NDIR non-dispersive infra-red instrument, PC personal computer.

TCD, thermal conductivity detector (Fig. 9.3.2c) Its response time is less than 1 ms (Fig. 9.3.8) and compatible with MGA requirements. Flowever, it only provides one channel of information. 

TCD = Thermal Conductivity D., MDID = MicroD is charge Ionization D., FD = Fluorescence D., CID = Chemi-Impedance D. (polymer film), MDOD = MicroDischarge Optical D., ITMS = Ion Trap MS,... 

Abbreviations GC, Gas Chromatography IRMS, Isotope Ratio Mass Spectrometry ECD, Electron Capture Detector FID, Flame Ionization Detector TCD, Thermal Conductivity Detector MS, Mass Spectrometry PDHID, Pulsed-Discharge Helium Ionization Detector mol. sieve, Molecular Sieve HP, Hewlett-Packard PE, Perkin-Elmer. 

Product separation was carried out using an arrangement of three columns 1) Semicapillary HP-1 (0.53 m X 5.0 m), that split the sample into two fractions a) volatile (C1-C4) and polar (methanol, water and DME) b) the remaining products. 2) Semicapillary SUPEL-Q Plot, (0.53 m X 30.0 m), for complete separation of volatile and polar components, which were analyzed using TCD (thermal conductivity detector) and FID (flame ionization detector). 3) Capillary PONA (0.20 mm x 50.0 m), for separation of the remaining products, which were analyzed by FID. 

TCD Thermal conductivity detector (used in GC primarily to analyze common gases such as methane and CO2)... 

Whereas the power of resolution depends on the quality of the column, quantification and identification of the separated compounds is a function of the detector. The oldest GC detector, still used for hydrocarbon gases, is the TCD (Thermal Conductivity Detector). The TCD response is proportional to the molar fraction and the specific heat of the compound detected. Its sensitivity is in the jug (10" g) range, but even for the same homologous family, this changes with molecular weight ... 

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