Inside Front Cover: Two‐dimensional gas chromatographic method for direct determination of formalin

2019 ◽  
Vol 2 (6) ◽  
Author(s):  
Kalsang Tharpa ◽  
Makarand Diwakar ◽  
Sudha Tantry ◽  
Kola S. Naidu ◽  
A. D. Rosa ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Direct Determination ◽  
Two Dimensional ◽  
Front Cover ◽  
Gas Chromatographic Method

Two‐dimensional gas chromatographic method for direct determination of formalin

2019 ◽  
Vol 2 (6) ◽  
pp. 210-215
Author(s):  
Kalsang Tharpa ◽  
Makarand Diwakar ◽  
Sudha Tantry ◽  
Kola S. Naidu ◽  
A. D. Rosa ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Direct Determination ◽  
Two Dimensional ◽  
Gas Chromatographic Method

scholarly journals Single-Laboratory Validation of a Gas Chromatographic Method of Direct Determination of Volatile Compounds in Spirit Drinks: Need for an Improved Interlaboratory Study

2019 ◽  
Vol 102 (2) ◽  
pp. 669-672 ◽  
Author(s):  
Siarhei V Charapitsa ◽  
Svetlana N Sytova ◽  
Anton L Korban ◽  
Lidia N Sobolenko
Keyword(s):  
Volatile Compounds ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Direct Determination ◽  
Relative Bias ◽  
Interlaboratory Study ◽  
Detector Response ◽  
Gas Chromatographic Method ◽  
Single Laboratory

Abstract Background: The quality and safety control of an alcoholic drink is mainly the establishment of its chemical content, particularly the quantity of volatile compounds. Objective: A single-laboratory validation of a gas chromatographic method of direct determination of volatile compounds in spirit drinks was conducted. The discussed method applies ethanol, the major volatile component of an alcoholic beverage, as an internal standard. Possible algorithms of method validation based on interlaboratory study were proposed and described. Methods: Seven standard solutions of the following volatile compounds were prepared gravimetrically in 40% (v/v) water–ethanol solution: acetaldehyde, methyl acetate,ethyl acetate, methanol, 2-propanol, 1-propanol, isobutanol, 1-butanol, and isoamylol. Each sample wasmeasured with the proposed method 30 times in repeatability conditions. Results: Flame ionization detector response was linearly correlated with assigned concentrations at a range of 2 to5000 mg/L of absolute alcohol (AA) with coefficients of determination (R2)more than 0.995 for all analyzed components. Repeatability (RSDr ≤ 4.5%; RSDr ≤ 2.0%), reproducibility (RSDR ≤ 5.0%; RSDR ≤ 2.0%), and trueness (relative bias ≤ 2.6%; relative bias ≤ 1.4%) were obtained for low (10–25 mg/L AA for methanol and 2–10 for othervolatiles) and high (25–5000 mg/L AA for methanol and 10–5000 for other volatiles) ranges of concentrations, correspondingly. Conclusions: The method increases the reliability of measurements and eliminates manual proceduresof internal standard addition into both calibrationstandard solutions and spirit drinks.

Gas Chromatographic Determination of Carbetamide Residues in Rape and Soil

1989 ◽  
Vol 72 (4) ◽  
pp. 660-662
Author(s):  
Jia-Lun Wu ◽  
De-Fang Fan
Keyword(s):  
Gas Chromatography ◽  
Petroleum Ether ◽  
Chromatographic Method ◽  
Direct Determination ◽  
Chromatographic Determination ◽  
Soil Samples ◽  
Nitrogen Phosphorus Detector ◽  
Gas Chromatographic Method ◽  
Nitrogen Phosphorus

Abstract A gas chromatographic method is described for direct determination of carbetamide residues in rape and soil. Rapeseed, leaves and stem of rape, and soil samples are extracted with acetone and the extracts are cleaned up by coagulation and partition with petroleum ether, followed by extraction with dichloromethane. Carbetamide is determined by gas chromatography using a nitrogen-phosphorus detector. Recovery ranges for rapeseed, leaves and stem of rape, and soil samples fortified with 0.1-10 ppm carbetamide were 91.4-103% [average 97.2 ± 12% (n = 9)], 94.4-102% [98.2 ± 4.4% (n = 12)], 87.9-93.9% [91.2 ± 6.5% (n = 9)1, and 86.7-102% [94.5 ± 4.5% (n = 15)], respectively.

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