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- [[File:Fig1 PassiveSampling.jpg|thumbnail|400 px|right|Figure 1. The Snap Sampler<sup>TM</sup> is an exampl [[File:Fig2 PassiveSampling.jpg|thumbnail|400 px|right|Figure 2. Passive diffusion bags are a common type o21 KB (2,965 words) - 22:01, 26 April 2022