Detectors ionization detector Flame

There are four main types of detectors used in GC thermal conductivity detector (TCD), also called a hot wire detector, flame ionization detector (FID), electron capture detector (ECD), and quadruple mass spectrometer (MS)... 

Elimination of wet chemical sample preparation enables a complete analysis to be performed and data to be quickly analyzed. The detection limits are in the low part-per-million range using mass spectrometric detection. Alternatively, detection of compounds can be achieved by all common gas chromatography detectors (flame ionization detector, electron capture detector and flame photometric detector), and detection limits are determined by the method of detection employed. 

Match the detector with the items that follow thermal conductivity detector, flame ionization detector, electron capture detector, and mass spectrometer detector. 

Fig. 4 Gas chromatographic traces of extracts from females of the pale brown chafer Phyl-lopertha diversa monitored by a conventional detector, flame-ionization detector (FID), and a biosensor, electroantennographic detector (EAD), using a male antenna as the sensing element. Although the peak of the sex pheromone (arrow) is hardly seen in the FID trace, its pheromonal activity was initially indicated by the strong EAD peak. Structural elucidation, followed by synthesis and behavioral studies lead to the identification of an unusual sex pheromone, l,3-dimethyl-2,4-(lff,3ff)-quinazolinedione [124]. It is unlikely that this minor compound would be fished out by a bioassay-oriented isolation procedure...

Detectors Flame-ionization detectors are used for most analyses, with lesser use made of thermal conductivity, electron-capture, nitrogen-phosphoms, and mass spectrometric detectors. For quantitative analyses, detectors must have a wide linear dynamic range the response must be directly proportional to the amount of compound present in the detector over a wide range of concentrations. Flame-ionization detectors have a wide linear range ( 106) and are sensitive to organic compounds. Unless otherwise specified in individual monographs, flame-ionization detectors with either helium or nitrogen carrier gas are to be used for packed columns, and helium is used for capillary columns. 

Detector Flame Ionization Detector (FID) for non-halogenated compounds Electron Capture Detector (ECD) for halogenated compounds... 

Chemical oxygen demand ( ) Electron capture detector ( ) Flame ionization detector... 

Detector Flame ionization Detector oven 300°C Oven Temperature 130° C isothermal Time per run 30 minutes... 

Carbon dioxide, P = 80 bar, program to 350 bar at 10 bar / min, T = 80°C Flow control by a fixed restrictor between the column and detector. Flame ionization detector is generally used (UV detector when organic modifiers are used). Split injection usually required. Syringe pumps commonly used (eluent flow rate 10s pl/min). 

Gas chromatograph with electron capture detector ECD and specific phosphorus detector (flame ionization detector AFID)... 

The connection to an appropriate detector flame ionization detector, thermal conductivity detector, flame photometric detector, nitrogen phosphorous detector (FID, TCD, FPD, NPD, etc.) is achieved via the four- or six-port valve being operated manually or electronically. The carrier gas (helium, nitrogen, argon, artificial air, etc.) flows via the valve only through the sampling column, at low flow rates (e.g., 25 cm /min) held constant during the experiments. 

Liquid samples were analyzed with an HP 5890 gas chromatograph combined with a Varian autosampler for Solid-Phase Micrpextraction (the SPME technique is described in [20] SPME fiber 85pm polyacrylate, 20 min extraction colunrn DP5 , 30 m x 0.25 mm, 0.25 pm carrier 1 ml/min He detector flame-ionization detector, 250°C oven 40°C to 2 °C (12 min) at 10°C/min). 

Some detectors respond to almost every compound in the column effluent. These detectors are called general or universal detectors. Flame ionization detectors (FIDs) and thermal conductivity detectors (TCDs) are examples of... 

The eluted components go to the detector of the gas chromatograph. The most commonly used detectors are thermal conductivity detector, flame ionization detector, electron capture detector, atomic emission detector, IR, ion trap detector, and MS. The detected components are processed by an integrator and appear on chart papers as a series of peaks on a time scale. The chart is called a gas chromatogram. 

The tests for u-hexane oxidation were carried out in a flow type glass reactor at GHSV =14400 h. An inlet u-hexane concentration of 2.5 g/m in air was used. The reaction products were analyzed by a Varian 3700 gas chromatograph equipped with thermal conductivity detector, flame ionization detector and 3 m column with Porapak Q. Only CO2, H2O and hexane were identified in the reaction prodncts. 

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