Determination of CO2 in Wines by Gas Chromatography

1964 ◽  
Vol 47 (4) ◽  
pp. 730-734
Author(s):  
Howard L Ashmead ◽  
Glenn E Martin ◽  
John A Schmit
Keyword(s):  
Gas Chromatography ◽  
Direct Method ◽  
Alcoholic Beverages ◽  
Gas Chromatograph ◽  
Injection Port ◽  
Carrier Gas ◽  
Solid Adsorbent ◽  
Partial Pressures ◽  
Injection Port Temperature

Abstract A fast and direct method is presented for the determination of CO2 in wines. Partial pressures from other ingredients of alcoholic beverages do not interfere. The method was compared to the manometric procedure under vacuum. An F & M Model 450 Gas Chromatograph with a filament detector was used for C02 determinations. Components were separated by a column 9” long and 1/8” o.d. using charcoal (60—80 mesh) as solid adsorbent. Injection port temperature was ambient; detector and column temperatures were 40°C. Helium was used as a carrier gas at the rate of 50 ml/min. Approximately 50 μ1 samples of standard and unknown solutions were used for the respective determinations.

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.

Determination of Serum and Urinary Phenylalanine by Gas Chromatography

1973 ◽  
Vol 19 (5) ◽  
pp. 496-498 ◽  
Author(s):  
Z K Shihabi ◽  
G K Summer
Keyword(s):  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Nitrous Acid ◽  
Gas Chromatograph ◽  
Phenyllactic Acid ◽  
Mild Conditions ◽  
Amino Acid Analyzer ◽  
Urine Specimens ◽  
Serum And Urine

Abstract Phenylalanine in serum and urine was determined by gas chromatography after it was converted, by action of nitrous acid, to the corresponding hydroxy acid, phenyllactic acid. After extraction with ether, the phenyllactic acid was derivatized with bis(trimethylsilyl)trifluoroacetamide under mild conditions, and the product was injected directly into the gas chromatograph. The precision of the method was verified by recovery studies and by comparison with the results of quantitative analysis of phenylalanine on an amino acid analyzer. Urine specimens from normal infants and children and from patients with phenylketonuria were analyzed by this method to show that the procedure is applicable to diagnosis of the disorder.

Determination of five estrogens in wastewater using a comprehensive two-dimensional gas chromatograph

2014 ◽  
Vol 6 (15) ◽  
pp. 5652-5658 ◽  
Author(s):  
Sameera R. Gunatilake ◽  
Taylor L. Clark ◽  
Jose M. Rodriguez ◽  
Todd E. Mlsna
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Two Dimensional ◽  
Gas Chromatograph ◽  
Quadrupole Mass ◽  
Trace Level ◽  
Quadrupole Mass Spectrometry ◽  
Novel Method

Comprehensive two-dimensional gas chromatography (GC × GC) hyphenated with rapid quadrupole mass spectrometry was successfully used to develop a novel method for the determination of trace level estrogens in influent and effluent wastewater.

A procedure for the determination of dichloromethane and tetrachloroethene in water using pervaporation and gas chromatography

2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Irena Rutkiewicz ◽  
Wojciech Kujawski ◽  
Jacek Namieśnik
Keyword(s):  
Gas Chromatography ◽  
International Agency ◽  
Gas Chromatograph ◽  
Human Carcinogen ◽  
Enrichment Technique ◽  
Liquid Samples ◽  
Basic Parameters ◽  
Direct Aqueous Injection

AbstractIn the present study, pervaporation was applied to the determination of tetrachloroethene (PCE) and dichloromethane (DCM) in liquid samples. PCE is the most commonly used solvent in drycleaning processes. PCE belongs to group 2A of carcinogens (probably carcinogenic to humans) according to the classification of the International Agency for Research on Cancer (IARC). DCM is also widely used as an industrial solvent for the purification and isolation of intermediates or products. DCM is classified as a “possible” human carcinogen by the IARC. The aim of this study was to evaluate a new procedure for the determination of DCM and PCE in liquid samples based on the pervaporative removal of DCM and PCE from liquid samples as an analyte isolation/enrichment technique, followed by a direct aqueous injection of the extracts onto the column of a gas chromatograph equipped with an electron capture detector (DAI-GC-ECD). The basic parameters of the new PV-DAI-GC-ECD procedure were evaluated.

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