Concentration Verification of Ethanol/Nitrogen Compressed Gas Cylinders Prior to use for Periodic Determinations of Accuracy in California

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Published: Journal of Analytical Toxicology, ISSN 0146-4760, Volume 25, Number 3, April 2001, pp. 215-218

TECHNICAL NOTE: Concentration Verification of Ethanol/Nitrogen Compressed Gas Cylinders Prior to use for Periodic Determinations of Accuracy in California
Dianna J. Matthias[1], Dennis C. Harvey[1],[2], and Dan E. DeFraga[1]
[1] Kern County Regional Criminalistics Laboratory, Bakersfield, California and
[2] Department of Molecular and Medical Pharmacology, UCLA School of Medicine, Los Angeles, California

A method that uses compressed gas ethanol breath standard (EBS®) cylinders to perform periodic determinations of accuracy on evidential breath alcohol instruments in California was developed. To use EBS cylinders, the California State Department of Health Services required verification of the ethanol content of the EBS cylinders using an infrared method. The infrared method developed employs a modified Alcotest 7110 MK III-C manufactured by National Draeger, Inc. that functions at the 9.5-mm wavelength of the infrared spectrum. Criteria and methodology for verifying EBS cylinder ethanol concentrations are described.

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