An analytical method, based on separation with gas chromatography (GC) and detection with optical fiber (OF), was used for the separation, detection and quantification of benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene. The use of OF as a detector is based on the variations of the reflected optical power detected when the aromatic compounds eluted from the GC column are sorbed i...

Many herbal medicines pertain characteristic odour which indicates the volatility of some compositions. Most of the volatiles constituents have low molecular weight, typically, monoterpenes, sesquiterpenes and phenylpropanes and their oxygenated derivatives (Harnone, 1998). Some herbs contain high content of volatile oils from which the oil themseleves are used as drugs, for example eucalyptus ...

We describe a novel isothermal gas-chromatographic procedure for measuring valproic acid. Plasma, with cyclohexanecarboxylic acid added as internal standard, is selectively extracted with pentane to minimize the extraction of other acidic drugs. To convert carboxylic acids to their phenacyl esters, alpha-bromoacetophenone is added to the organic extract before evaporating the solvent. These est...

Experimental results are presented from an experiment in which ionization created by a highenergy x-ray synchrotron radiation beam intersecting an ethylene diffusion flame is measured.The ionization signal is believed to arise from x-ray absorption by aggregated soot particles.Comparisons are made between these ionization profiles and those due to natural flameionization. Visibl...

acetonitrile used as a solvent in manufactures and affects to central nervous system from inhalation exposure. the aim of this study was to develop a micro-solid phase extraction method for  the determination of acetonitrile in the air matrix. the sampling was performed with a small diameter fused silica fiber coated with a thin film of stationary phase and was subsequently desorbed and analyze...

The proportions and constituents of the essential oils flowers leaves Primula veris subsp. columnae were determined, antioxidant antimicrobial (antibacterial antifungal) properties their methanol extracts investigated. Percentage ratios main components plant, which grows naturally, detected by extracting flower leaf volatile oils. oil identified with Gas Chromatography Mass Detector-Flame Ioniz...

A rapid, sensitive and selective gas chromatographic method with flame ionization detection was developed for the determination of paraldehyde in small blood samples taken from children. Whole blood samples (300 microl) collected in a 3 ml Wheaton glass sample vial were spiked with acetone (internal standard: 15 ng) followed by addition of concentrated hydrochloric acid. The mixture was heated ...

The use of pesticides provides benefits such as growing food products necessary for life, sustainability production efficiency and prevention diseases caused by pests. However, these can turn into negative effects humans other living organisms with the in inappropriate doses application methods. In this study, it was aimed to determine resmethrin, which belongs insecticide class, gas chromatogr...