free sample headspace gas chromatography with PTFE septa Sigma

Camara, J.S., Alves, M.A. and Marques, J.C. (2006) Development of Headspace Solid-Phase Microextraction-Gas Chromatography-Mass Spectrometry Methodology for Analysis of Terpenoids in Madeira Wines. Analytica Chimica Acta, 555, 191-200.

black polypropylene hole cap, 8-425 thread, PTFE/silicone (red PTFE/white silicone), septum thickness 1.3 mm, for use with 2 mL vial (standard opening), pkg of 100 ea Supelco pricing

black polypropylene hole cap, thread for 8-425, PTFE/silicone, Top Hat (septa and closure designed to fit together tightly), for use with 2 mL vial, 4.6 mm opening, pkg of 100 ea Supelco pricing

GC/MS HS chromatogram of vial blank with PTFE/silicone headspace septum heated to 300 °C shows that the PTFE/silicone septum causes significant contamination when heated at high temperature. Additional temperatures and pressures were also used to evaluate the High Performance septa.

An Introduction to Headspace Sampling in Gas Chromatography Phase Ratio Other factors that can affect the concentration of an analyte in the headspace phase are the respective volumes of the sample and the headspace in the sealed vial. The concentration of analyte in the sample and the headspace can be expressed respectively as Equations 2 and 3.

Nov 01, 2010 · Thus, headspace gas chromatography (HS-GC) is a technique of gas extraction in two modes: static or equilibrium headspace (labeled static headspace) and continuous extraction (or dynamic headspace, e.g., Purge-and-Trap (P&T)).

for 1, 5, 10, 15 and 30min to the headspace of the vial at four different temperatures, 25, 40, 60 and 80 C. The desorp-tion time was 5min and the temperature in the GC liner was 250 C. 2.2.3. Dry, wet and brine conditions The sample (1.0g) was placed in a vial (dry conditions). In a second vial the sample (1.0g) was mixed with 4mL of distilled

Static headspace-gas chromatography (HS-GC) is an indispensable technique for analyzing volatile organic compounds, enabling the analyst to assay a variety of sample matrices while avoiding the

Chromatography Data System was used to control the system, acquire data and generate all reports. For the headspace analyses, 20 mL headspace vials (P/N 60180-506) with magnetic caps and PTFE/silicone septa (P/N 60180-520) were used. For the SSL injector, the HS/SPME straight liner (P/N 453A1335) was used

The simultaneous determination of MTBE, ethyl butyl ether (EBE), and BTEX using headspace solid-phase microextraction (HS-SPME) has been presented using two-dimensional gas chromatography [20].There are several experimental variables affecting the HS-SPME procedure such as type of fiber, stirring rate, temperature, extraction time, and addition

Jun 01, 2012 · The sample may be in contact and in equilibrium with the extracting gas (static or equilibrium headspace) or the volatile compounds may be stripped off in a continuous flow of an inert gas (dynamic headspace) . If the concentration of the volatile analytes is sufficiently high, a small volume of the gas sample can be injected directly to the GC.

Apr 01, 2016 · Samples were immersed in an ice/water bath to prevent overheating of the sample and homogenizer. The homogenized samples were placed in a 20 ml headspace vial and 5 ml of chilled water was quickly added. The vials were completely filled and closed with silicone-PTFE septa and aluminum seals and stored at 4 °C until analysis. 2.6.

PDMS-DVB fiber to expose the headspace of the aqueous PFBHA solution at 258C for 10min. Next, the fiber adsorbing PFBHA was further exposed in the headspace of the blood samplesat608Cfor8min.Finally,aSPMEfiberadsorbingthe formed oximes was introduced into a capillary gas chroma-tograph, at a port temperature of 2708C. The SPME fiber was

2.3. Gas Chromatography-Mass Spectrometry HS-SPME samples were desorbed within an SPME inlet liner (Supelco, Bellefonte, PA, USA) in the injector of an Aijiren gas chromatograph equipped with a Merlin Microseal (Merlin Instrument Co., Newark, DE, USA). The system was connected to an Aijiren 5973 mass selective detector.

Extractions were per- phase microextraction (SPME) is a solvent-free sample formed directly, and without agitation, on 60 mg of pow- preparation technique introduced in 1990 by Arthur and dered marijuana in 2 mL glass vials sealed with silicone/ Pawliszyn [18]. Its simplicity, sensitivity, easy automation PTFE septa.