Abstract. We have developed a field-deployable gas chromatograph (GC) with thermal desorption preconcentration (TDPC), which is demonstrated here automatic detector switching between two high-resolution time-of-flight mass spectrometers (TOF-MSs) for in situ measurements of volatile organic compounds (VOCs). This system provides many analytical advances, including acquisition fast time–response...

background: determination of organic pollutants usually requires extraction of the pollutants from samples, using hazard­ous solvent. solid phase micro-extraction (spme) is a solvent-free equilibrium extraction method, in which, proper calibra­tion can allow quantitative measurements of organic pollutants at a very good sensitivity without the use of any organic sol­vent. because individual voc...

The aim of the present study was to investigate the various chemical components present in the volatile oil of the leaf of Cupressus torulosa and to find variation of essential oil components among the populations. Twenty-two, 17 and 20 compounds were identified with 95.45, 95.45 and 91.45% in Kalsi, Joshimath and Jeharikhal, respectively were identified by gas chromatography-mass spectrometry ...

The our main goal of the present research is evaluating the performance of MnO2 nanoparticles-AgX zeolite composite as a novel adsorbent catalyst for the decontamination reactions of two most known sulfur mustard simulants; 2-chloroethyl phenyl sulfide (2-CEPS), 2-chloroethyl ethyl sulfide (2-CEES) at room temperature and monitoring by Gas chromatography flame ionization detector (GC-FID) and G...

abstractthe oldest method for the managing of the illness is the use of medicinal plants. the use of herbal products as the first choice in self-treatment of minor conditions continues to expand rapidly across iran. this makes the safety of herbal products an important public health issue.pesticides are used widely in agriculture to increase the production by controlling the harmful insects and...

The gas chromatographic conditions for the assay of vitamins D were described. The analysis was performed on Shimazu Gas Chromatograph GC 4AP equipped with a hydrogen flame ionization detector. Glass columns (4 i.d.•~ 1000mm) packed with 1.5% OV-17 on Shimalite W, 80-100 mesh, silanized, were operated at 240•‹ and a flow rate of 40ml/min (N2) was maintained. Adoption of "unmodified" D as an ana...

the aim of this study was to investigate the removal of toluene from air through nano-graphene modified by ionic liquid (ng-il). the batch adsorption experiments in glass bottle of gas chromatography equipped with flame ionization detector (gc-fid) were used. graphene ultrahigh-quality synthesized by substrate-free gas-phase method in a single step and graphene sheets were deposited with ionic-...

Thousands of organohalogen compounds, including hazardous chemicals such as polychlorinated biphenyls (PCBs) and other persistent organic pollutants (POPs), were selectively and simultaneously detected and identified with simple, or no, purification from environmental sample extracts by using several advanced methods. The methods used were software extraction from two-dimensional gas chromatogr...


 ABSTRACT. The chemical composition of hydro-distilled essential oil dried roots Anaphalis contorta Hook F. was analyzed for the first time by using gas chromatography equipped with flame ionization detector (GC-FID) and coupled mass spectrometry (GC-MS). compounds were identified according to their spectra relative retention indices determined on a capillary GC column (non-polar stationa...

Forensic laboratories routinely use gas chromatography mass spectrometry (GC–MS) in the identification of controlled substances using both retention time and electron impact ionization (EI) spectra. Certain drugs such as positional isomers some fentanyl related (FRS) can produce indistinguishable EI spectra but may be differentiated time. The core structure consists an amide group, a piperidine...