Gas chromatograph/mass spectrometer techniques for determination of interferences in pesticide analysis

1972 ◽  
Vol 44 (3) ◽  
pp. 603-606 ◽  
Author(s):  
Ernest J. Bonelli
Keyword(s):  
Mass Spectrometer ◽  
Pesticide Analysis ◽  
Gas Chromatograph

On-site determination of nerve and mustard gases using a field-portable gas chromatograph-mass spectrometer

2006 ◽  
Vol 24 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Hiroyuki Sekiguchi ◽  
Koji Matsushita ◽  
Shigeharu Yamashiro ◽  
Yasuhiro Sano ◽  
Yasuo Seto ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Gas Chromatograph ◽  
Portable Gas Chromatograph

scholarly journals Identification and Determination of Methylmercury Compounds in Fish Using Combination Gas Chromatograph-Mass Spectrometer.

1970 ◽  
Vol 24 ◽  
pp. 2349-2354 ◽  
Author(s):  
Britta Johansson ◽  
Ragnar Ryhage ◽  
Gunnel Westöö ◽  
Ragnar Ohlson ◽  
Akira Shimizu
Keyword(s):  
Mass Spectrometer ◽  
Gas Chromatograph ◽  
Methylmercury Compounds

scholarly journals POLYCYCLIC AROMATIC HYDROCARBONS IN THE ORGANIC PHASE EXTRACTED FROM CHARCOAL FOR BARBECUE

2018 ◽  
Vol 41 (5) ◽  
Author(s):  
Ananias Francisco Dias Júnior ◽  
Carlos Rogério Andrade ◽  
José Otávio Brito ◽  
Simone Possedente Lira ◽  
Azarias Machado de Andrade ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Mass Spectrometer ◽  
Apparent Density ◽  
Organic Phase ◽  
Aromatic Hydrocarbons ◽  
Calorific Value ◽  
Gas Chromatograph ◽  
Polycyclic Aromatic ◽  
The City

ABSTRACT Charcoal is a widely used product for barbecue, however, its quality for said use has not been well studied. Polycyclic aromatic hydrocarbons (PAHs) are a class of carcinogenic compounds that can be present in charcoal. Thus, the objective of this study was to analyze the organic phase extracted from charcoal by organic solvents, regarding the presence of PAHs. For this, a commercial charcoal brand was acquired, collected in establishments in the city of Piracicaba, São Paulo. Complementary tests were carried out to identify the wood used in the production of charcoal, such as determination of humidity, apparent density, immediate composition, calorific value, and combustion index. The organic phase extracted from the charcoal using cyclohexane was analyzed in a gas chromatograph coupled to a mass spectrometer (GC/MS) for identification of a class of sixteen PAHs. In general, charcoal presented regular characteristics for barbecue. All PAHs analyzed were detected in the organic phase extracted from the charcoal, but the observed values were below the quantified limit determined

Determination of serum cholesterol by isotope dilution mass spectrometry with a benchtop capillary gas chromatograph/mass spectrometer: comparison with the National Reference System's Definitive and Reference Methods

1991 ◽  
Vol 37 (7) ◽  
pp. 1161-1165 ◽  
Author(s):  
John H Eckfeldt ◽  
Linda A Lewis ◽  
John D Belcher ◽  
Jasbir Singh ◽  
Ivan D Frantz
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometer ◽  
Isotope Dilution ◽  
Isotope Dilution Mass Spectrometry ◽  
Internal Standard ◽  
Reference Method ◽  
Gas Chromatograph ◽  
National Reference ◽  
Definitive Methods

Abstract We developed an isotope dilution mass spectrometric cholesterol method with [25,26,27-13C]cholesterol as internal standard and a benchtop gas chromatograph/mass spectrometer (GC/MS) that is much easier and less time consuming than previously described Reference and Definitive Methods for cholesterol. The internal standard, cholesterol standards, and unknown specimen are delivered volumetrically with an automated dilutor and the saponifying reagent. After saponification, extraction, and derivatization, specimens are injected into a benchtop quadrupole MS with an autosampler. Unknown cholesterol concentrations are calculated automatically by comparing the peak area ratio of the m/z = 368, 371 ion pair with the ratios for the cholesterol standards (0 to 12.93 mmol/L). We found within-run and day-to-day (overall) imprecision of 0.44% and 0.95%, respectively, when specimens were assayed singly. In several lyophilized and frozen Standard Reference Material (SRM) pools, cholesterol results with our GC/MS method averaged 0.4% less than the National Institute for Standards and Technology definitive GC/MS result performed about three years earlier. Our GC/MS results averaged 1.3% and 2.0% less than results by the National Reference System (NRS) Abell-Levy-Brodie-Kendall (ALBK) results from clinical specimens and the SRM pools, respectively. These results are consistent with the previously reported bias between the NRS Reference and Definitive Methods and the 0.1% per year decrease in cholesterol concentrations in SRM pools as determined by GC/MS analysis. These results further emphasize the small but consistent bias between cholesterol results by isotope dilution mass spectrometry and the ALBK Reference Method, the latter being the basis for the National Cholesterol Education Program guidelines and population reference values.

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