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Method for rapid on-site identification of VOCs

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Journal of Environmental Sciences 2009年第7期21卷 1005-1008页

作者： Justin D Fair William F Bailey Robert A Felty Amy E Gifford Benjamin Shultes Leslie H Volles Department of Chemistry University of Connecticut Storrs Connecticut 06269-3060 USA. INFICON Inc. 2 Technology Place East Syracuse New York 13057 USA

Rapid on-site identification of volatile organic compounds （VOCs） in ambient air is an important first step in remediation efforts. This study describes modification of a commercially available, portable GC/MS system and development of an analysis protocol for rapid （〈 3 min） sampling and identification of VOCs typically found at contaminated sites at the low ppbv level.

关键词： field analysis gas chromatograph mass spectrometer toxic industrial chemicals thermal desorption

Quick Measurement of CH_4, CO_2 and N_2O Emissions from a Short-Plant Ecosystem

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Advances in Atmospheric Sciences 2003年第5期20卷 842-844页

作者：王跃思王迎红 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing100029

Combining improved injector, gas line and valve-driving models, a gas chromatograph (GC) equipped with Hydrogen Flame Ionization Detector (FID) and Electron Capture Detector (ECD), can measure CH4, CO2, and N2O simultaneously in an air sample in four minutes. Test results show that the system has high sensitivity, resolution, and precision; the linear response range of the system meets the requirement of flux measurements in situ. The system is suitable for monitoring fluxes of the main greenhouse gases in a short-plant field since it is easy to use, efficacious, and constant and reliable in collecting data.

关键词： gas chromatograph valve emission of greenhouse gases ecosystem

Experimental investigation on combustion and unregulated emission characteristics of butanol-isomer/gasoline blends

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Journal of Central South University 2019年第8期26卷 2244-2258页

作者： LI Yuan-xu NING Zhi YAN Jun-hao School of Mechanical Electronic and Control Engineering Beijing Jiaotong UniversityBeijing 100044 China Beijing Key Laboratory of New Energy Vehicle Powertrain Beijing Jiaotong University Beijing 100044 China Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignIL 61801 USA

Effects of butanol isomers on characteristics of combustion and emission were studied on PFI SI engine. Experiments were operated under the condition of 3 and 5 bar brake mean effective pressure (BMEP) engine loads and different equivalence ratios (φ=0.83-1.25) with engine speed of 1200 r/min using blends made of 70 vol.% gasoline and 30 vol.% butanol isomers (N30, S30, I30 and T30). The results indicated that compared with gasoline, all butanol isomer blends have higher cylinder pressure. N30 has the highest and most advanced peak pressure, and T30 shows a higher brake specific fuel consumption (BSFC) and lower brake thermal efficiency (BTE). N30 presents a lower UHC emissions and I30 has slightly higher CO emissions than other blends. For unregulated emissions, compared with gasoline, butanol isomer blends have higher acetaldehyde, and N30 produces a higher emission of 1,3-butadiene than other blends. A reduction in benzene, toluene, ethylbenzene and xylene (BTEX) has been found with butanol isomer blends.

关键词： Butanol isomers unregulated emission combustion characteristics gas chromatograph SI engine

Preparation and Uncertainty Assessment of Standard Work Solution of Hexachlorobenzene,Malathion and Sulfotep

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Plant Diseases and Pests 2014年第6期5卷 25-28页

作者： Wang Lu Peng Hui Luo Ming Agro-Environmental Protection Institute Ministry of AgricultureAgro-Environmental Quality SupervisionInspection & Testing Center ( Tianjin) Ministry of Agriculture

[ Objective ] To prepare standard work solution of three pesticides used in the intermediate check of gas chromatograph and evaluate the uncertainty of solution. [ Method ] In view of intermediate check needs of gas chromatograph, common pesticides in pesticide residual test were taken as the study objects, i.e., hexachlorabenzene, malathion and Sulfotep, state pesticide reference materials as the materials, volumetry was applied to prepare standard work solution of pesti- cides. Evenness and stability of the work solution was tested by using gas chromatographs installed with electron capture detector （ECD）, flame photometric detec- tor （FPD） and flame ionization detector （ FID）, respectively, and after the evaluation of concentration, uncertainty of the work solution was assessed from the per- spectives of raw materials, preparation process, evenness and stability. [ Result ] Mass concentrations of the three standard work solution was 0.1 mg/L, 10.0mg/ L, 100.0 mg/L, respectively, and relative expanded uncertainty 2.640%, 1. 980% and 2.400% （ k = 2）. [ Conclusion] The study offers technical support for the intermediate check of laboratory apparatuses.

关键词： gas chromatograph Intermediate check Pesticide Uncertainty

Application of GC/EIMS in Combination with Semi-Empirical Calculations for Identification and Investigation of Some Volatile Components in Basil Essential Oil

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International Journal of Analytical Mass Spectrometry and chromatography 2016年第1期4卷 14-25页

作者： Mamoun S. M. Abd El-Kareem Mohamed Abd El Fattah Rabbih Ezzat Taha Mohamed Selim Elsherbiny Abd El-monem Elsherbiny Ayman Yasen El-Khateeb Molcular and Atomic Physics Unit Experimental Nuclear Physics Dept. Nuclear Research Centre Egyptian Atomic Energy Authority Inshas Cairo Egypt Plant Pathology Department Faculty of Agriculture Mansoura University Mansoura Egypt Agricultural Chemistry Department Faculty of Agriculture Mansoura University Mansoura Egypt

Volatile components in the extracts of basil leaves (Ocimum basilicum L.) were identified by gas chromatography/mass spectrometry (GC/MS) with electron ionization (EI) mode. The major volatile components of basil under investigation are α-pinene, sabinene, β-pinene, d-limonene, eucalyptol, l-linalool and estragole. Electron ionization mass spectra of these compounds have been obtained and investigated. Furthermore, the semi-empirical MNDO [Modified Neglect of Diatomic Overlap] method was used to calculate the thermochemical data for the structural properties of these compounds.

关键词： gas chromatograph Mass Spectrometer Semi-Empirical Calculations Basil Essential Oil