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| flask | sample was collected/stored in measurement flasks/canisters before analysis |
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| preconcentration | sample was preconcentrated before analysis. This refers to the process of concentrating a sample before analysis, so that trace components won't be overlooked. This is done typically through absorption of the sample onto a cooled, sorbent-packed trap before thermal desorption to transfer very quickly the sample to the analytical system. Can be more than 1 trap, with different adsorbents |
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| filter | air was passed through a filtering system before analysis, selectively retaining compound(s) of interest |
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| filter pack | sample was collected in a filter pack, selectively retaining compound(s) of interest | denuder | air was passed through a denuder before analysis to selectively retain compound(s) of interest (a denuder is cylindrical or annular conduit or tube internally coated with a reagent that selectively reacts with a stable flow of gas) |
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| sorbent tube | sample was passed through a sorbent tube to trap and retain the compound(s) of interest |
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| reagent reaction | reagent reaction: sample reacted with a liquid/solid chemical reagent before measurement | |
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