Thermal energy analyser

TEA (1) Thermal evolution analysis (2) Thermoelectric analysis (3) Thermal energy analyser... 

Where the target analyte contains heteroatoms such as nitrogen, phosphorus and sulfur, atom-selective detectors can provide an ideal detection method. A number of examples appear in the literature of the use of a detector called a thermal energy analyser (TEA) for the measurement of A-nitroso compounds [14-17] and aromatic nitro compounds [18]. This has also been used as an HPLC detector [19, 20], and a modified TEA has been reported to be useful for analysis of amines and other nitrogen-containing compounds [17]. Unfortunately, this technique appears not to have gained in popularity, since no reports have appeared in the literature for over two decades. 

A-nitroso cpds Biological matrices and foodstuffs GC Thermal energy analyser [16]... 

V-Nitrosodiethanolamine can be determined in air and bulk process samples. Air samples are collected on glass fibre filters, extracted with 2-propanol and analysed by gas chromatography with thermal energy analyser detection. The limit of detection is 200 ng per sample (0.42 pg/m ). Bulk samples can be screened for 7V-nitrosodiethanol-amine by high-performance liquid chromatography (HPLC) with ultraviolet detection (Occupational Safety and Health Administration, 1990). 

The chapter has been structured into several sections first, there is a brief introduction, including a description of the concept and general principles of CL and how it is used in the field of explosives. The second section describes CL applications in the field of explosives and focuses in particular on the thermal energy analyser (TEA) because of its important role in the trace detection of explosives. The recent applications of luminol CL and electrochemiluminescence (ECL) to explosive detection are also described. Finally, because much of the research into explosive detectors has been directed towards civilian safety, a third section describes how CL is used as a security measure to detect explosives. 

Fig. 2. Simplified schematic of the thermal energy analyser. Reprinted from Fine et al. [25]. Copyright (1975),...

Fig. 3. Processing scheme. Reprinted with permission from Warren et al. [46]. Copyright (1999) Forensic Science Society. CE, capillary electrophoresis GC, gas chromatography TEA, thermal energy analyser IC,...

Fig. 6. Chromatograms of standard nitroglycerine (NG) obtained using thermal energy analyser (TEA) and FID (0.0004 mg/mL). Reprinted from Bowerbank et al. [48]. Copyright (2000), with permission from...

Table 2. Applications of gas chromatography-thermal energy analyser (GC-TEA) to explosive analysis...

Supercritical fluid chromatography-thermal energy analyser Supercritical fluids are produced by heating a gas above its critical temperature or compressing a liquid above its critical pressure. In SFC, the sample is carried through a separating column by a supercritical fluid (typically C02) that is used as mobile... 

NG = Not given GC = gas chromatography TEA = thermal energy analyses HRGC = high resolution gas chromatography MS ECD = electron capture detector HRMS = high resolution mass spectrometry... 

The only detection method that is recognized as specific for nitrosamines is the thermal energy analyser (TEA). This technique, combined with GC separation, has become the most commonly used detection method for volatile NOCs because of its specificity, speed, and accuracy. A functioning scheme is represented in Figure 2. The GC eluent is introduced into a catalytic pyrolyzer where the catalytic cleavage of the N-nitroso bond is produced, releasing the nitrosyl radical (NO ) ... 

Fine DH, Rufeh F, Lieb D, and Rounbehler DP (1975) Description of the thermal energy analyser (TEA) for trace determination of volatile and non-volatile N-nitroso compounds. Analytical Chemistry 47 1188-1190. 

Thermal energy analyser Thermal extraction GC-MS Transmission electron microscopy... 

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