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[Comparative measurements with breath alcohol measuring devices].

G Schoknecht1

  • 1Bundesgesundheitsamt, Berlin.

Blutalkohol
|November 1, 1992
PubMed
Summary

This study evaluated two breath-alcohol analyzers for forensic use. Both instruments demonstrated high precision, with a standard deviation below 0.01 mg/l for breath alcohol concentration measurements.

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Breath-alcohol analyzers are crucial for law enforcement and clinical settings.
  • Ensuring the accuracy and reliability of these devices is paramount for forensic applicability.
  • Regulatory bodies like the Federal Health Office set essential requirements for breath analysis instruments.

Purpose of the Study:

  • To assess the performance and precision of two different breath-alcohol analyzers.
  • To compare measuring systems, including infrared and fuel cell technologies.
  • To evaluate the forensic applicability of the tested breathalyzers.

Main Methods:

  • A drinking experiment involving 12 participants was conducted.
  • Two distinct breath-alcohol analyzers were tested, one with dual infrared and fuel cell systems, the other with a single infrared system.
  • Breath temperature and volume were measured to standardize breath alcohol concentration (BrAC) to 34°C.

Main Results:

  • Both instruments met essential requirements for forensic use.
  • The precision of all tested systems was high, characterized by a standard deviation of less than 0.01 mg/l.
  • BrAC values were comparable after standardization to a reference temperature.

Conclusions:

  • The evaluated breath-alcohol analyzers exhibit excellent measuring precision suitable for forensic applications.
  • Both infrared and fuel cell technologies, when properly implemented, provide reliable breath alcohol measurements.
  • The study supports the forensic applicability of modern breathalyzer technology.

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