The Gas Chromatography/Mass Spectrometry (GC/MS) instrument separates chemical mixtures (the GC component) and identifies the components at a molecular level (the MS component).

Jan 2, 2006 · Figure 3 - Typical mass chromatogram of volatile residue in hexane caused by PTFE/silicone septa: a) hexane extract of a piece of septum; b) vial septum was punctured once by a syringe to sample 1 μL hexane for GC analysis; c) hexane in the last vial was reanalyzed after 3 days; and d) analyzed immediately after 100 μL hexane was added from one vial to another (the septum was punctured 10

in the mass spectra shortly after the ion source is cleaned. Fingerprints contain hydrocarbons that can appear in mass spectra. Hydrocarbon con-tamination is characterized by a series of mass peaks 14 amu apart. The abundances of these peaks decrease as peak mass increases. Fingerprint contamination is usu-ally caused by the failure to wear

Choosing the right septa chart 2 Septa selection guide Septa material: General Chromatography vials 3 Septa material: 20 mm headspace septa 4 Temperature stability chart 4 Seal properties 5 Seal selection (for headspace and sample preparation (20 mm) applications) 6 Septa hardness General chromatography vials (in 8 mm, 9 mm, 11 mm, 12 mm caps) 7

The vials used for the preparation of breath samples for automated solid-phase microextraction–gas chromatography–mass spectrometry analysis are crimped with septa. These septa often emit specific volatile organic compounds (VOCs) confounding the measurement results of breath samples.

Jun 9, 2022 · At first glance septa bleed has a base peak of m/z 73, while column bleed has a base peak of m/z 207. But keep in mind both column bleed and septa bleed are made up of cyclosiloxanes. These differences are investigated below. Experimental Design. The first part of this experiment was the extraction and concentration of both septa bleed and

JOURNAL OF MASS SPECTROMETRY J. Mass Spectrom. 2004; 39: 233–254 Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jms.606 SPECIAL FEATURE: TUTORIAL Solid-phase microextraction: a powerful sample preparation tool prior to mass spectrometric analysis Gyorgy Vas¨ 1∗ and Karoly V´ ekey´ 2

On most mass spectrometers which use autotuning programs to adjust electron multiplier voltage, the tune voltage will increase with age. When the mass spectrometer begins to tune in excess of 2800 volts, it is time to replace the multiplier. More accurate methodology is needed in order to determine multiplier performance and to eliminate errors

Jan 30, 2023 · It is defined as one twelfth of the rest mass of an unbound atom of carbon-12 in its nuclear and electronic ground state, and has a value of 1.660538782 (83)x10 -27 kg. The following diagram displays the mass spectra of three simple gaseous compounds, carbon dioxide, propane and cyclopropane.

Mar 17, 2023 · Triple quadrupole mass spectrometers (LC/MS/MS) are established in labs dealing with challenging matrices, as they offer very low detection limits with specificity and selectivity. These factors positively impact the efficiency and cost-effectiveness of laboratory operations. Additionally, LC/MS/MS solutions have been improved to add automation

Jul 10, 2012 · Abstract. The significant presence of septum-related ghost peaks, causing interference in routine gas chromatography–mass spectrometry analyses at sample injection port temperatures above 100°C, is demonstrated.

Aijiren's autosampler vials are available as either snap, screw or crimp in style. Most users will be familiar with the main 2 mL vial being the HPLC vial or LC/MS vial; sometimes being referred to as a 1.5 mL vial. We have also designed a range of 2 mL GC vials and GC/MS vials for your gas chromatography applications. Explore our range of

Broad selection of syringes for different autosamplers, injection techniques and applications Gas Chromatograph-Mass Spectrometry; ... Find the septa for your needs.

Mar 17, 2009 · In HPLC often slitted or cross-slitted Silicone/PTFE Septa are used, in order to offer a penetration aid for the fairly thick and dull needles used in the HPLC instruments. While the instrument needle requires the slitted septa, the user may run into the risk of concentration changes due to the evaporation of solvents.

Polyethylene septa are not resealable and intended for single injection use. Polypropylene (PP) Septa: Chemically resistant polypropylene septa are available as 0.01” thick disks inserted into aluminum crimp seals. The surface for needle penetration is 0.01” thick allowing for use with thin gauge needles. Polypropylene septa are not