Optical cavity enhancement is a highly desirable process to make sensitive direct-absorption spectroscopic measurements of unknown substances, such as explosives, illicit material, or other species of interest. This paper reports advancements in the development of real-time cavity ringdown spectroscopy over a wide-bandwidth, with the aim to make headspace measurements of molecules at trace leve...

BACKGROUND The adolescent and early adult years are periods of peak prevalence and incidence for most mental disorders. Despite the rapid expansion of Web-based mental health care, and increasing evidence of its effectiveness, there is little research investigating the characteristics of young people who access Web-based mental health care. headspace, Australia's national youth mental health fo...

A multi purpose sampler (Gerstel MPS), designed for liquid large volume, gaseous and headspace samples was tested for its suitability in the GC-MS analysis of organic volatiles in human urine. Headspace sampling with a volume, temperature and speed controlled gas tight syringe was combined with a temperature controlled cold injection system for cold trapping, enrichment and focussing of analyte...

dracocephalum kotschyi (lamiaceae), as one of the remarkable aromatic plants, widely grows and also is cultivated in various temperate regions of iran. there are diverse reports about the composition of the oil of this plant representing limonene derivatives as its major compounds. there is no report on cloning of mono- or sesquiterpene synthases from this plant. in the present study, the aroma...

Flower scent is an important trait of ornamental roses and has been character in the selection processes. In present study, composition volatile organic compounds (VOCs) emitted by both petals pollen 21 garden (Chinensis, Climber, English rose, Floribunda, Hybrid Tea, Multiflora, Damascena, Musk Polyantha, Rugosa Shrub) was investigated through GC-MS Static Headspace method. A total 19 differen...

A headspace solid-phase microextraction (HS-SPME) method is developed for the determination of styrene in drinking water. Gas chromatography (GC)-mass spectrometry is utilized for qualitative analysis. A manual SPME holder with 85-microm polyacrylate coating is used to extract the styrene from water, which is determined to have good linearity (correlation coefficient r = 0.9999 for 1.00-100.00 ...

Volatile compounds from the headspace gas of ten brands of the Japanese fish sauce ishiru were analyzed by GC-MS with a thermal-desorption cold-trap system. Many volatile peaks were detected and 51 compounds were identified. The major volatile compounds in ishiru included aldehydes (such as 2-methylpropanal, 2-methylbutanal, 3-methylbutanal, and benzaldehyde), nitrogen-containing compounds (suc...

Abstract The aim of the study was to compare effectiveness use low-peak chromatographic fingerprints for differentiation various food products. Three groups unprocessed products (mushrooms, hazelnuts and tomatoes), preparations (bread, dried herbs tomato juice) alcoholic beverages (vodka two types blended whiskey) were examined. A commercial electronic nose based on ultrafast gas chromatography...

Bromochlorinated compounds are organic contaminants originating from different natural and anthropic sources increasingly found in environmental compartments. This work presents an online approach for compound specific stable isotope analysis of chlorine bromine ratios bromochlorinated trihalomethanes using gas chromatography coupled to quadrupole mass spectrometry (GC-qMS). An evaluation schem...