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VOCs are detected for two purposes. The first is to determine if an area is safe from explosive or combustible levels of gas, and the second to quantify concentrations of specific VOCs due to their toxicity or as compliance with environmental guidelines.
Combustible and exposive mixtures are measured with an explosimeter. A device which operates on the principle of resistance proportional to heat -- a wire is heated, and a sample of the gas is introduced to the hot wire. Combustible gases burn in the presence of the hot wire, thus increasing the resistance and disturbing a Wheatstone bridge. The Output is interpreted as a concentration of gas.
Detecting VOCs for speciation is done by:
* Bagging a sample for later analysis at a laboratory with a GC/Mass Spec unit * Absorbing VOCs from the gas stream on activated carbon for later desorbtion and laboratory examination * In situ analysis with a portable GC/Mass Spec. * By passing a laser beam through the gas and noting reflection or adsorption bands
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MaxineVOCs can be detected using specialized equipment such as gas chromatography or portable VOC monitors. These devices can measure the concentration of VOCs in the air and provide real-time data on their presence. Detection can also be done using colorimetric tubes or passive samplers.
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