Manual for Analysis of Ethanol in Biological Liquids

Dubowski, Kurt M. · 1977 · ROSA P / United States. National Highway Traffic Safety Administration. Research Institute

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Summary

This manual, prepared by Kurt M. Dubowski for the U.S. Department of Transportation’s National Highway Traffic Safety Administration, addresses the standardization of forensic alcohol analysis. The research was motivated by the wide variability in results reported by different laboratories in proficiency surveys, a problem attributed to the lack of a universally accepted reference method. The document aims to provide precise procedural details and performance characteristics for analyzing ethanol in biological liquids to improve reliability in traffic law enforcement. The manual outlines comprehensive protocols for specimen selection, collection, preservation, and analysis. For living subjects, blood is identified as the only practical specimen for routine law enforcement, with specific recommendations for venous whole blood collection using aseptic, non-alcoholic skin disinfectants to prevent contamination. For cadavers, the text recommends blood from large peripheral vessels (e.g., femoral artery) or vitreous humor to avoid contamination from gastrointestinal diffusion or decomposition. The core analytical method described is gas chromatography (GC) of headspace vapors. The manual provides detailed instructions for both automated (using the Multifract F-40 instrument) and manual GC procedures, including the use of internal standards. It specifies materials, apparatus, reagents, and instrument conditions, such as equilibration times and temperatures, to ensure accurate partition ratios between air and blood. The findings establish the analytical performance characteristics of the proposed GC headspace method. The manual demonstrates that the method is highly reliable, linear, and precise, making it suitable for use as a referee or reference method. It includes data on detector response linearity, precision of replicate analyses, and performance in double-blind proficiency surveys. The text also addresses quality assurance, detailing the validation of reference materials and performance monitoring. Furthermore, it provides guidance on interpreting results, noting the limitations of using urine or saliva for estimating blood-alcohol concentration (BAC) and discussing the complexities of interpreting postmortem findings, particularly in decomposed specimens. The significance of this work lies in its contribution to the standardization of forensic toxicology. By providing a detailed, validated protocol for ethanol analysis, the manual seeks to eliminate inter-laboratory variations and ensure that alcohol analysis results are valid, reliable, and admissible in legal proceedings. It serves as a practical guide for forensic scientists, emphasizing the importance of proper specimen handling and rigorous analytical techniques to support traffic safety enforcement and judicial accuracy.

Key finding

The manual establishes gas chromatographic headspace analysis as a highly reliable reference method for ethanol determination and identifies venous whole blood as the most practical specimen for living subjects while recommending vitreous humor and peripheral blood for postmortem cases.

Methodology

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Provenance

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• alcohol