Amines And Nitrosamines

Extensive research has been done on the determination of amines including aromatic, aliphatic, alkyl, poly, glyco, biogenic amines and nitrosamines by various chromatographic methods in which many applications are based on the derivatization procedures adopted through different detection systems. The determination of aromatic amines has been carried out by capillary zone electrophoresis (CZE), High-performance Liquid chromatography (HPLC), GC, or GC-mass spectrometry with selected ion...

Alliston Taylor Anal

Cancer, 10, 114, 1956. 2. Preussmann, R. and Steward, B. W., In Chemical Carcinogens, American Chemical Society Monograph No. 182, 2nd ed., Searle, C. W., Ed., American Chemical Society, Washington, DC, 1984, chap. 12. 3. Tricker, A. R. and Preussmann, R., Mutat. Res., 259, 277, 1991. 4. Preussmann, R. and Eisenbrand, G., In Chemical Carcinogens, American Chemical Society Monograph No. 182, 2nd ed., Searle, C. W., Ed., American Chemical Society, Washington, DC,...

References

Wang, H., Li, J., Liu, X., and Zhang, H.-S., N-hydroxysuccinimidyl fluorescein-0-acetate as a highly fluorescent derivatizing reagent for aliphatic amines in liquid chromatography, Anal. Chim. Acta, 423, 77-83, 2000. 3. Kataoka, H., Derivatization reactions for the determination of amines by gas chromatography and their applications in environmental analysis, J. Chromatogr., 733, 19-34, 1996. 4. Kijima, K., Kataoka, H., and Makita, M., Determination of aromatic amines as their...

Sample Cleanup Methods

The selectivity of the extraction procedure and analytical technique will determine the sample cleanup needs. As always, the number of additional steps in an analysis must be minimized because concentration and solvent exchange steps can increase the risk for contamination and analyte loss. Particulate filters and waste samples often contain aliphatic hydrocarbons and monoaromatic compounds, while soil and sediment extracts may contain elemental sulfur, lipids, proteins, dissolved soil organic...

Gas Chromatographic and Detection Conditions for BTEX Analysis in Soils

Temperature Program Carrier Gas Detection Method Reference Column SPB-1 Length m 30 I.D. mm 0.53 Film thickness tm 1.5 Column RTx-5 fused silica capillary of polydimethylsiloxne 5 phenyl groups Length m 31 I.D. mm 0.54 Film thickness tm 1.6 Column RTx-5 fused silica capillary of polydimethylsiloxne 5 phenyl groups Length m 30 I.D. mm 0.32 Film thickness tm 1.8 Column RTx-502.2 Length m 60 I.D. mm 0.32 Film thickness tm 1.8 40 C 5 min to 200 C at 7.5 C min - 40 C 5 min to 250 C at 7 C min 50 C 1...

Atmospheric Sampling of PAH

PAHs and related compounds will partition in the atmosphere between the gaseous aerosol and particulate phases.51 Naphthalene, a two-ring PAH, is found primarily in the gaseous phase while PAHs with five or more rings are found almost exclusively sorbed to particulate matter soot . The difficulty comes in the measurement of three- and four-ring PAHs because they tend to partition between the gaseous and particulate phases. A single collection method will be inadequate for the analysis of a...

Passive Sampling Parameters for the Analysis of BTEX in

Monitoring urban air quality and uptake rates measurements Residential indoor and outdoor levels of VOCs and personal exposure Method optimization for analysis Indoor and ambient air levels of VOCs Monitoring urban air quality and uptake rates measurements ORSA 5 sampler tube-type diffusive sampler 400 mg of activated charcoal contained in a 0.5 cm diffusive path and 0.88 cm2 cross sectional area sampler OVM 500 sampler batch-type diffusive sampler 180 mg of activated charcoal contained in a 1...

Soxhlet Extraction

US EPA Method 3540 is for the Soxhlet extraction of nonvolatile and semivolatile organic pollutants from environmental solids and solid wastes.141 Solid samples are mixed with anhydrous sodium sulfate and placed in an extraction thimble inside a Soxhlet extraction apparatus. The Soxhlet apparatus allows the solvent to be distilled and recycled through the system thereby introducing fresh solvent with each cycle. Concentration and solvent exchange are usually required before analysis. Surrogate...

Multidimensional Separation Techniques

In a technique referred to as GC X GC or two-dimensional GC, direct coupling of two columns with different selectivities allows for a continuous separation of closely eluting or coeluting peaks therefore, it readily separates PAH isomers and many other species that coelute under ordinary capillary column conditions. A GC X GC-MS system has been described where the first separation was on a 20 m X 0.25 mm i.d. 5 phenyl dimethylpolysiloxane column with 0.25 m film thickness. Eluate from the first...

Stir Bar Sorptive Extraction SBSE

In order to increase the sorption capacity over SPME, a glass-coated stir bar was covered with 1-mm thick silicone PDMS tubing to conduct stir bar sorptive extraction or SBSE.131 The 10- to 40-mm long stir bars were conditioned by heating at 300 C for 4h. Stirring ensured good contact between the solution and the sorbing surface. After a predetermined equilibration time, the stir bar was removed, dried of water, and transferred to a glass thermal desorption tube. Thermal desorption at 250 C for...