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. Author manuscript; available in PMC: 2018 Feb 21.
Published in final edited form as: Anal Chem. 2015 Feb 10;87(5):2779–2787. doi: 10.1021/ac504101a

Figure 8.

Figure 8

Harvesting efficiency experiments with modified sample swabs. The QCM responses, based on sampling 200 μg Tropine, are plotted on the ordinate. All measurements were carried out at a QCM detector temperature of 150 °C. Sample collection was based on controlled harvesting from a glass plate with the exception of the last sample “direct deposition”, which infers to the maximal harvesting efficiency possible. The inserts are optical magnifications of (A) the blank Teflon-coated sample swab and (B) lightly sanded swab modification.