Thu11November0627PM 3

Methods of oxygen measurement include:

True / False

Galvanic fuel cell Incorrect answer selected

Infrared absorption Correct

Paramagnetic analysers Correct

Optodes Correct

Mass spectrometry Incorrect answer selected

Explanation

Oxygen measurement can be carried out by paramagnetic gas analysers, mass spectrometry, fuel cells, Clark electrodes and optodes.

Molecules are paramagnetic if they are attracted toward a magnetic field. This is due to the molecules possessing two unpaired electrons in their outer electron shell. Oxygen is paramagnetic.

Mass spectrometers separate complex gas mixtures allowing their individual measurement.

Oxygen does not absorb infrared light because it is not composed of two dissimilar atoms. Carbon dioxide is commonly measured by this method. Oxygen does however absorb ultraviolet radiation.

The galvanic fuel cell allows measurement of oxygen in blood samples.

Optodes are a method of oxygen measurement, which employ fluorescent dyes.

Reference:

Smith T, Pinnock C, Lin T (eds.) Fundamentals of Anaesthesia. 3rd ed. Cambridge: Cambridge University Press; 2009.

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