free sample headspace gas chromatography with silicone septa Chrominex

In the GC-MS analysis by liquid injection, the autosampler was used for solvent addition, standardization, and calibration. Contamination from the silicone septa was identified, which is related to cyclic PDMS residue and curing agents, 6 in which hexa-methylcyclotrisiloxane is designated as D3, octamethylcyclotetrasiloxane as D4, decamethylcyclopentasiloxane as D5, and so forth.

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

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tometry [5, 6]. Electrophoresis [7, 8], gas chromatography (GC) [9–11], and liquid chromatography [ 12], mainly ion chromatography [13], are applied to determine individual acids. GC is the method of choice to separate SCMAs in free form and as derivatives

The powdered dry samples were placed in 4 mL sample vials sealed with a polypropylene hole cap and PTFE/silicone septa (Supelco, Bellefonte, PA, USA). For each extraction, after the SPME needle pierces the septum, the fibre was extended through the needle and exposed to the HS above a sample (5-100 mg) under a temperature (20-90 C).

Differ- by dipping the fibre directly into an aqueous sample and ent desorption times were tested to ensure a total transfer headspace-SPME (HS-SPME) with extraction of the SPME was successfully employed for the analysis of Can- nabis components in biological matrices such as saliva 2.4 GC/MS conditions [28, 29] and hair [30, 31], as well as in food products [32].

Headspace analysis combined with high-resolution gas chromatography and detection by mass spectrometry was evaluated for the analysis of 53 volatile organic compounds (VOCs) in

2003/6/5 · Drug-free urine samples collected from a healthy adult male were used to make amphetamine standard urine samples and used as control urine. All samples were extracted from 9-ml clear glass vials, sealed with silicone septa and aluminium caps (Alltech 2.2.

static headspace gas chromatography with flame ionization detection Hongmei Hu 1 , Tiejun Li 1 , Xiumei Sun 1 , Xiaojun Zhang 1 , Xiaonin g Zhang 2 , Zhi Zhong 1 , Yuanming Guo 1 *

A method based on headspace solid-phase microextraction–gas chromatography–mass spectrometry is proposed for the quality control of multilayer packaging and its manufacturing process.

After sample treatment, the aqueous extracts are subsequently analyzed by headspace/gas chromatography/mass spectrometry allowing the determination of BTEX-S within ca. 15 min. Each stage of the proposed LLE/HS/GC/MS configuration involves a selectivity enhancement avoiding the interference of other compounds of the sample matrix.

2020/3/13 · gas chromatography headspace sulfur chemiluminescence sulfur dioxide “truly” free SO 2 wine analysis Sulfur dioxide (SO 2) is the oldest and arguably one of the most important additives used in winemaking.When present in sufficient concentration, SO 2 has five major effects in wine/musts: (1) SO 2 is a strong antimicrobial agent and provides a protection against a wide array of detrimental

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The butyl septa on the PTFE surface can be used in the headspace sample bottle to evaluate the injection activity and the penetration efficiency of methyl bromide on the activated carbon. The septum can be used to seal the vial during liquid sample collection