scholarly journals Analysis of Volatile Compounds in Food and Cosmetic, Using the Purge and Trap Injector Coupled to a Gas Chromatograph with Photo Ionization Detector

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Yunfang Zhao ◽  
Sheming Lua ◽  
Chunbo Liu ◽  
Zhaoyu Meng ◽  
Chaomin Ni ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Purge And Trap ◽  
Photo Ionization

Direct Blood-Injection Method for Gas Chromatographic Determination of Alcohols and Other Volatile Compounds

1971 ◽  
Vol 17 (2) ◽  
pp. 82-85 ◽  
Author(s):  
Naresh C Jain
Keyword(s):  
Sample Preparation ◽  
Volatile Compounds ◽  
Low Cost ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Blood Injection

Abstract An extremely simple, rapid method is described for simultaneously determining methanol, ethanol, acetone, isopropanol, and low-boiling hydrocarbons associated with glue sniffing. Less than 1 µl of blood, mixed with an internal standard, is injected directly into a low-cost gas chromatograph equipped with a flame-ionization detector. No extraction, distillation, and (or) sample preparation is required, and the method is sensitive to less than 10 µg of alcohol per ml.

Microdetermination of Ethylene Dibromide in Air by Gas Chromatography

1982 ◽  
Vol 65 (6) ◽  
pp. 1379-1381 ◽  
Author(s):  
T Dumas ◽  
E J Bond
Keyword(s):  
Gas Chromatography ◽  
Ambient Temperature ◽  
Flame Ionization Detector ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Ethylene Dibromide ◽  
Flame Ionization ◽  
Photo Ionization ◽  
Portable Gas Chromatograph ◽  
Aqueous Standard

Abstract Using a new, sensitive photo-ionization detector in a portable gas chromatograph that operates at ambient temperature, a method was developed for determining ethylene dibromide in air as low as 19 ppb. Vapor standards were prepared for calibration of the detector; concentrations in these standards were accurately determined by using a flame ionization detector. This detector was previously calibrated with an aqueous standard of ethylene dibromide. Using the 2 gas chromatographs, the loss of ethylene dibromide through sorption from the atmosphere of the vapor standards was determined. Solubility of ethylene dibromide in water was also established at 3 temperatures, using the flame ionization detector.

Research of Odor Detecting Method Using Micro-Fluid Chip and its Experiments

2014 ◽  
Vol 1010-1012 ◽  
pp. 446-451
Author(s):  
Xu Zhang ◽  
Wei Zhou ◽  
Si Xiang Zhang ◽  
Xin Ying Yang ◽  
Jing Meng Cheng ◽  
...  
Keyword(s):  
Micro Channel ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Chip Technology ◽  
Degree Of Separation ◽  
Atmosphere Pollution ◽  
Gas Separator ◽  
Photo Ionization ◽  
Detecting Method ◽  
Theoretical Plates

A kind of online or portable online odor detector is needed for continuously monitoring the concentration and tracing the source of the odor which is one of the atmosphere pollution. Combining gas chromatograph (GC) and micro-fluidic chip technology, we present a kind of odor detecting system which using micro-fluidic chip for gas separator and photo ionization detector (PID) for sensor. The 115×60×6mm micro-fluidic chip, etched a micro channel of 1mm diameter and 1.8m length inside, is filled by polyethylene glycol as stationary phase according to the type and character of odor. Respectively using micro-fluidic chip and stainless steel packed columns, the acetone detecting experiments prove that corresponding values of the theoretical plates numbers are 2156 and 1250, in addition, the values of their tailing factor are 1.20 and 1.33. The separation experiment between acetone and ethyl alcohol in the chip illustrate the degree of separation is 3.1.

INCIDENCES OF POLYCYCLIC AROMATIC HYDROCARBONS IN ROASTED PLANTAINS OBTAINED WITHIN OSOGBO METROPOLIS, NIGERIA

2021 ◽  
Vol 21 (2) ◽  
pp. 539-546
Author(s):  
ABIONA OLUSEYE OLADAPO ◽  
ADEGUNWA ABIODUN ODUNLAMI ◽  
AWOJIDE SHOLA HEZEKIAH ◽  
ANIFOWOSE ADEBANJO JACOB ◽  
TAYO ADENIYI SOLOMON
Keyword(s):  
Soxhlet Extraction ◽  
Carcinogenic Risk ◽  
Diagnostic Ratios ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Total Pahs ◽  
Flame Ionization ◽  
Regulatory Limits ◽  
Polycyclic Aromatic ◽  
Extracting Solvent

The present study was conducted to assess the carcinogenic and non-carcinogenic health risks of PAHs contamination in roasted plantain collected from three different locations within Osogbo metropolis, Nigeria. The PAHs were extracted using Soxhlet extraction technique with n-hexane and dichloromethane (3:1) as the extracting solvent. A column, packed with silica gel, was used for clean-up process and the levels of the targeted PAHs were determined by a gas chromatograph–flame ionization detector (GC-FID). The result revealed that the concentrations of total PAHs detected in the roasted samples at location A, B, C were 3.958 μg/kg, 3.654 μg/kg and 3.217 μg/kg. The HMW carcinogenic PAHs constitute about 32% of the total PAHs in the roasted plantain samples where benzo(a)pyrene, which is a marker for carcinogenicity, was found to be 9%. Comparing these results with the regulatory limits, all the analyzed roasted plantain samples were found below the maximum residual limit (MRL) of 5 μg/kg, but the calculated carcinogenic risk (CR) presented value greater than 1×10-4, signifying health risk associated with the consumption of the roasted plantain. The major source of the PAHs using diagnostic ratios (Fla/Pyr and Ph/Ant) showed that the charcoal used in roasting is a major contributing factor to the high levels of PAHs detected in the roasted plantain samples.

scholarly journals Determination of N-Nitrosodimethylamine in the Smoke of High-Nitrate Tobacco Cigarettes

1973 ◽  
Vol 7 (2) ◽  
Author(s):  
G.P. Morie ◽  
C.H. Sloan
Keyword(s):  
Capillary Column ◽  
Glass Capillary Column ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Glass Capillary ◽  
Flame Ionization ◽  
Basic Solutions ◽  
Poly Ethylene ◽  
Gas Chromatographic Method

AbstractA gas chromatographic method was developed for the determination of N-nitrosodimethylamine (NDMA) in cigarette smoke. The NDMA in the smoke of 200 cigarettes was trapped in a solution of sodium hydroxide and separated from most of the smoke components by distillation from acidic and basic solutions. The aqueous solution was extracted for 8 hr. into ethyl ether in a Dean Stark apparatus. To concentrate the solution of NDMA, the ether was distilled until only 5 ml of the solution remained. An aliquot of this solution was analysed by means of a gas chromatograph equipped with a 200-ft. glass capillary column coated with Carbowax 20-M poly(ethylene glycoI). An alkali metal flame ionization detector with a selectivity of 10*/1 for nitrogen compounds to normal hydrocarbons was used. Small amounts (2 ng) of nitrosamines in the presence of large amounts of other compounds were easily detected. N-nitrosodimethylamine-C

Gas-chromatographic method for plasma acetate analysis in acetate-intolerance studies.

1978 ◽  
Vol 24 (2) ◽  
pp. 348-350 ◽  
Author(s):  
L G Nielsen ◽  
K O Ash ◽  
E Thor
Keyword(s):  
Chromatographic Method ◽  
Hemodialysis Patients ◽  
Flame Ionization Detector ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Single Column ◽  
Gas Chromatographic Method

Abstract We describe a modified gas-chromatographic method for acetate in serum or plasma, intended for use in the investigation of acetate intolerance in hemodialysis patients. The assay may be adapted for use with a single-column gas chromatograph equipped with a flame ionization detector. The analysis, made isothermally, requires only 0.5 ml of plasma or serum. Only one deproteinizing step is required to prepare the sample for analysis. Additionally, we present preliminary findings of an ongoing acetate-intolerance study.

Determination of volatile alcohols and acetone in serum by non-polar capillary gas chromatography after direct sample injection.

1984 ◽  
Vol 30 (10) ◽  
pp. 1672-1674 ◽  
Author(s):  
N B Smith
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Capillary Column ◽  
Internal Standard ◽  
Fused Silica ◽  
Gas Chromatograph ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Split Ratio

Abstract In this method for detection and quantification of volatile alcohols by capillary gas chromatography, the serum sample is deproteinized, then directly injected into the gas chromatograph with 1-propanol as the internal standard. The capillary column is a 30-m bonded methylsilicone-coated, fused-silica column. With helium as the carrier gas, the injector inlet is set at a split ratio of 1/30 and the average linear velocity in the column is 25 cm/s. Injector and flame-ionization detector temperatures are 280 degrees C, oven temperature 35 degrees C. Chromatography time is less than 3 min.

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