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Showing 1 to 20 of 90 for “"solid phase microextraction"”.
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Extending the Limits of Solid Phase Microextraction
<p>Solid phase microextraction (SPME) is a solventless extraction technique that combines sample preparation and sample introduction into a gas chromatograph into a single step. For the past 20 years, solid-phase micro-extraction (SPME) has been used in numerous fields such as: food analysis, …
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Solid phase microextraction of amino-dinitrotoluenes in tissue.
… in environmental matrixes and tissues. Solid phase microextraction (SPME) was used to extract ADNTs (amino-dinitrotoluenes) from tissue as a potential method to investigate the recalcitrance of metabolically-generated ADNTs versus absorbed ADNTs. Tubifex tubifex was allowed to metabolize …
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Extraction of alcohols from gasoline using solid phase microextraction (SPME)
… and quantification of EtOH in gasoline by solid phase microextraction (SPME). The major problem in quantifying EtOH in gasoline is the coelution of hydrocarbons with EtOH. There have been several approaches to solve this problem; among the chromatographic ones, three major types have been …
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Forensic sample analysis using supercritical fluid extraction coupled with solid phase microextraction
… combining supercritical fluid extraction and solid phase micro-extraction (SFE/SPME) is introduced. This coupled procedure utilises the advantages of using supercritical carbon dioxide as an extraction solvent and collecting the extract on a selected SPME fibre. Together the combined …
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Use of solid-phase microextraction to detect semiochemicals in synthetic and biological samples
… studies was to determine the effectiveness of solid-phase microextraction (SPME) at identifying semiochemicals (chemical messengers) in both synthetic and biological samples. Solid-phase microextraction, an alternative to traditional sample fractionation, employs specialized polymer fibers to …
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Detection of Illicit Drugs in Various Matrices Via Total Vaporization Solid-Phase Microextraction
In Headspace Solid-Phase Microextraction (Headspace SPME), a sample is heated to encourage a portion of the analyte into the headspace of a vial. A coated fiber is introduced into the sample headspace and the analyte is adsorbed onto the fiber coating. Total Vaporization Solid-Phase Microextraction …
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Development of Total Vaporization Solid Phase Microextraction and Its Application to Explosives and Automotive Racing
Pipe bombs are a common form of improvised explosive device, due in part to their ease of construction. Despite their simplistic nature, the lethality of pipe bombs should not be dismissed. Due to the risk of harm and their commonality, research into the pipe bomb deflagration process and …
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Predicting the bioavailability and toxicity of hydrophobic pesticides using bioassays and a solid phase microextraction approach
… is an important factor in risk assessment. Solid phase microextraction (SPME) is an equilibrium partitioning technique that has been successfully used to estimate body residues by measuring the freely dissolved chemical concentration and assessing chemical bioavailability in exposure media. …
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Profile of Missouri Norton wine aroma using solid phase microextraction of headspace, gas chromatography-olfactometry, mass spectrometry
… volatile compounds was performed using headspace solid-phase microextraction (HS-SPME) and identified by a trained panel. The samples were then diluted to determine the most important odor active compounds, resulting in thirty one compounds responsible for the nine most common descriptors of …
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Advances in solid phase microextraction for the analysis of volatile compounds in explosives, tire treatments, and entomological specimens
<p>Solid phase microextraction is a powerful and versatile technique, well-suited to the analysis of numerous samples of forensic interest. The exceptional sensitivity of the SPME platform, combined with its adaptability to traditional GC-MS systems and its ability to extract samples with minimal …
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Advances in Solid Phase Microextraction for the Analysis of Volatile Compounds in Explosives, Tire Treatments, and Entomological Specimens
Solid phase micro-extraction is a powerful and versatile technique, well-suited to the analysis of numerous samples of forensic interest. The exceptional sensitivity of the SPME platform, combined with its adaptability to traditional GC-MS systems and its ability to extract samples with minimal …
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Sample Preparation/Concentration for Trace Analysis in GC/MS (A study of solid phase microextraction and headspace sampling)
Solid Phase Microextraction (SPME) associated with Microwave Assisted Extraction (MAE)<sup>(1-3)</sup> , on-line headspace derivatization <sup>(4-6)</sup> and the selectivity of different SPME coatings <sup>(7)</sup> were studied. Trace amounts of Veltol ®, Veltol Plus® and short chain fatty acids …
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The Effect of Wine Matrix Ingredients on 3-Alkyl-2-methoxypyrazines Measurements by Headspace Solid-Phase Microextraction (HS-SPME)
… 3-alkyl-2-methoxypyrazines was investigated with solid-phase microextraction (SPME) and capillary gas chromatography, using a nitrogen phosphorus detector. Changes in the recovery of 3-ethyl-, isopropyl-, sec-butyl-, and isobutyl-2-methoxypyrazines from the static headspace of synthetic wine …
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Characterization of human expired breath by solid phase microextraction and analysis using gas chromatography-mass spectrometry and differential mobility spectrometry
… applied to this problem. Tedlar bags and solid-phase microextraction were used for breath sampling and concentration prior to analysis. Four fiber coatings were evaluated with respect to selectivity and sensitivity; extraction time, gas chromatography temperature programming, and sample …
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Characterization of human skin emanations by Solid Phase Microextraction (SPME) extraction of volatiles and subsequent analysis by Gas Chromatography-Mass Spectrometry (GC-MS)
… headspace above samples were extracted by a solid-phase microextraction fiber which incorporated a composite coating of liquid polymer matrix and solid porous particles. This protocol provided robust and convenient signatures of human skin emanations and was applied to two experiments for …
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Development of a headspace solid-phase microextraction (HS-SPME) procedure for the determination of short-chain fatty acids (SCFAs) in activated sludge by GC-FID
… treatment includes the removal of inorganic solids such as sand and gravel as well as organic materials, phosphorus, and nitrogen. Activated sludge, containing a variety of living organisms, is added into the wastewater treatment system. Short-chain fatty acids (SCFAs), an energy source of …
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Naujų mikroekstrakcijos sistemų kūrimas, tyrimas ir taikymas lakių aromatinių angliavandenilių nustatymui /
A new solid phase microextraction system composed of nanotubes coating fixed on a stainless steel support is suggested. Thermal stability and selectivity of the system was examined. It was determined that the system can be used for direct and headspace extraction of volatile aromatic hydrocarbons. …
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Development, investigation and application of new microextraction systems for determination of volatile aromatic hydrocarbons /
A new solid phase microextraction system composed of nanotubes coating fixed on a stainless steel support is suggested. Thermal stability and selectivity of the system was examined. It was determined that the system can be used for direct and headspace extraction of volatile aromatic hydrocarbons. …
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STUDIES ON THE ANALYSIS AND THE FATE OF ORGANIC POLLUTANTS IN THE ENVIRONMENT
… first part of the thesis, new techniques such as solid-phase extraction, solid-phase microextraction, and electrochemical detection, were studied and applied to the analysis of pesticides and their degradation products in environmental samples. Statistical optimizations were used to develop …
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