laboratory headspace gas chromatography Sigma

22/10/2020 · Moreover, most of these methods lack specificity, involve long procedures, interfere with other anions or use a headspace injection system for gas chromatography (GC), which is not widely available. We aimed to develop a GC method coupled to a nitrogen phosphorous detector (NPD) for the simultaneous detection of azide and cyanide in several biological matrices.

Traditional methods for TEA detection include gas chromatography, electrochemical analysis and gel chromatography [2] [3] [4]. However, their application has been hindered by the high cost and

Gas chromatography mass spectrometry (GC-MS) coupled with pre-concentration techniques has been developed to successfully identify and quantify different atmospheric monoterpenes (Janson, 1993; Räisänen et al., 2009; Song et al., 2015).

Description. 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). It is one of the most accurate tools for analyzing environmental samples. The GC works on the principle that a mixture will separate into individual

28/11/2014 · Toxicological analysis of GHB is commonly performed in traditional biological specimens (e.g., urine or blood/plasma), by headspace gas chromatography/flame ionization (), gas chromatography/mass spectrometry (GC–MS) or liquid chromatography/mass).

Short-chain chlorinated paraffins (SCCPs) are a new type of persistent organic pollutants. In this work, a simple and effective method involving headspace solid-phase microextraction (HS-SPME) and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOF-MS) was developed and optimized for the determination of trace

22/12/2013 · The gas is then analyzed for methane by gas chromatography. Here, we revisit the headspace equi-libration technique and describe a simple, inexpensive, and reliable method to measure methane in fresh and seawater, regardless of concentration. Within the

8/6/2017 · Headspace gas chromatography (HS-GC) has become a powerful tool for the analysis of volatile species in samples having complex non-volatile matrices []. In previous work [19, 20], HS-GC was used for determining the CMC of surfactants.

Ascertaining the authenticity of the unrefined sesame oil presents an ongoing challenge. Here, the determination of 2-propenal was performed by headspace solid-phase microextraction (HS-SPME) under mild temperature coupled to gas chromatography with time-of-flight mass spectrometry, enabling the detection of adulteration of unrefined sesame oil with refined corn or soybean oil. Employing this

Learn how Thermo Scientific gas chromatography instruments are designed to be customized, so they can fit any laboratory workflow. High Performance Liquid Chromatography Built from the ground up, Thermo Scientific HPLC and UHPLC instruments enable you to raise your productivity to the next level and give you confidence in your results.

17/6/2011 · In the present manuscript, the metabolic volatile profiles of allergic asthma and control children were evaluated by headspace solid-phase microextraction combined with gas chromatography–quadrupole mass spectrometry (HS-SPME/GC–qMS).

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21/10/2014 · Abstract The aim of our study was to present a new headspace-gas chromatography-mass spectrometry (HS-GC-MS) method applicable to the routine determination of hydrogen sulfide (H 2 S) concentrations in biological and gaseous samples. The primary

applications with non-food products, headspace (HS) gas chromatography is the recommended method of analysis. The method for the quantitative determination of residual solvents in flexible packaging by static headspace is reported in the European Standard