Validation of a Quantitative Determination Method of Blood Alcohol by Gas Chromatography-Headspace with Dual Column

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Watcharachai Rujirojkul
Supisara Sukkasem
Varaporn Chonumpai

Abstract

Blood alcohol level analysis is a routine task in toxicology laboratories. The widely accepted analytical method for accurate results is Gas Chromatography-Head Space (GC-HS) employing dual columns and a flame ionization detector (FID). By comparing the retention times (RT) obtained from the two columns, the type of substance can be accurately identified, and its quantity can be determined using the calibration curves. This study aimed to develop and validate a method for analyzing blood alcohol levels using gas chromatography. Agilent equipment, specifically the GC model 7890B coupled with HS model 7697A, was utilized, along with two alcohol separation columns: DB-BAC1 and DB-BAC2. The findings indicated that the retention time for ethanol was 1.068 minutes on the DB-BAC1 column and 1.175 minutes on the DB-BAC2 column, with tert-butanol serving as an internal standard. The linearity of the method ranged from 5.7 to 376.02 milligram percent (mg%), exhibiting a high correlation coefficient (R2 = 0.9999) for both columns. The percentage of recovery (%Recovery) ranged from 96.83% to 105.76%. The Limit of Detection (LOD) was determined to be 5 mg%, while the Limit of Quantitation (LOQ) was found to be 7 mg%. Consequently, this improved analysis method holds promise as an effective means for determining blood alcohol content.

Article Details

How to Cite
Rujirojkul, W., Sukkasem, S., & Chonumpai, V. (2023). Validation of a Quantitative Determination Method of Blood Alcohol by Gas Chromatography-Headspace with Dual Column. Journal of Criminology and Forensic Science, 9(1), 91–107. retrieved from https://so02.tci-thaijo.org/index.php/forensic/article/view/262881
Section
Research Articles

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