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Breathalyzers/blood-tests/BAC; How long does it take for alcohol to dissipate in the body?

May 04, 2008 by Lee | Posted in Beer, Wine & Spirits

On the breathalyzer and blood tests for alcohol (BAC), how long does it take for alcohol to dissipate in the body? A person can show a 0.00 on a blood test, but still have had a drink earlier in the night?

Thank you for your answers, thoughts, ideas and advice.

All useful links to information would also be greatly appreciated!

Thank you very much!
Please see my other question regarding this issue of breath and my son Prom night.

The dissipation rate depends on your body weight and metabolism of a good rule of thumb is the body process approximately .02 BAC per hour. It is therefore possible to have three drinks and later show a 0.0 blood alcohol level three hours.

This is not a particularly good area for experimentation. If you drink, do not drive or operate machinery and vice versa. In this case prevention is better than cure.

Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction:

Apr 09, 2008 by vana | Posted in Chemistry

Breathalyzers determine the level of alcohol in the breath of a person by the following (unbalanced) reaction oxidation-reduction:


C2H5OH + Cr2O72 -> CH3CO2H + Cr3 + (acidic solution).

If analyzing a breath sample generates 2.20 x10-4 M Cr3 + ion in 45.0 ml mg how much alcohol he does it contain?

You first need to balance the equation (do rxns half, then add):

3C2H5OH + 2Cr2O7 ^ 2 - + 16H + ----> 3CH3CO2H + 4Cr ^ 3 + + 27H2O


Then find the number of moles of Cr ^ 3 +:

, 045 L * 2.20e-4 mol / L = 9.9 e-6mol

Then the problem of equivalence:

9.9E-6mol of Cr3 + 3moles of C2H5OH = / 4 mole of Cr3 +

9.9E-6 divided by the moles of Cr3 + and multiply by the number of moles of C2H5OH.

You get 7.425e-6mol of C2H5OH (alcohol). Now its just a question of conversion in grams, and mg.

Voila:

7.425e-6 mol of alcohol * alcohol 46.08g/mol
= 3.42144e-4 g alcohol / 10e-3 g = 342,144 mg of alcohol.

Yay!

Alcohol Breathalyzer

:)

Drugs & Alcohol » Blog Archive » Digital Breathalyzer UK-what ...

by admin

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Source: Drugs & Alcohol » Blog Archive » Digital Breathalyzer UK-what ...