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**Definition:** *refers to the type of sampling used by the primary sampling instrument measurement instrument, or is the sample preparation phase).*
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| Name | Definition |
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| ---------- | --------------------------------------------------------- |
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| continuous | air is drawn in continuously, with a consistent flow rate |
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| injection | | |
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| Name | Definition |
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| ------------------- | ------------------------------------------------------------------ |
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| continuous | air is drawn in continuously, with a consistent flow rate |
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| injection | instrument is injected with limited quantities of air |
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| continuous injection | instrument is periodically injected with limited quantities of air |
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| passive | air is not drawn in, rather the air sampled is the ambient air which interacts which measurement apparatus. | |
