Traceable measurements of breath alcohol and interfering substances are required to underpin drink driving, airline and other workplace legislation. Gas standards containing these compounds can be used, for example, to calibrate evidential breath analysers as specified by the OIML (International Organization of Legal Metrology) International Recommendation OIML R 126 (Evidential breath analyzers).
Gas standards containing ethanol and interfering substances can be prepared to the requirements of the customer. Examples of the most common components in these mixtures are given below. Other interfering substances (such as those listed in OIML R 126) may be available on request.
Component | Matrix gas | Amount fraction range | |
From | To | ||
Ethanol | Nitrogen or air | 20 μmol/mol | 1.6 mmol/mol |
Methanol | Nitrogen or air | 10 μmol/mol | 100 μmol/mol |
Acetone | Nitrogen or air | 10 μmol/mol | 100 μmol/mol |
Toluene | Nitrogen or air | 10 μmol/mol | 100 μmol/mol |
Methyl ethyl ketone | Nitrogen or air | 100 μmol/mol | 1 mmol/mol |
Ethanol | Nitrogen or air |
20 μmol/mol | 1.6 mmol/mol |
Carbon dioxide | 10 mmol/mol | 100 mmol/mol |
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