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. 2015 Dec 16;408:943–952. doi: 10.1007/s00216-015-9187-z

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Extraction optimization measurements for PAL SPME Arrow extractions of PAH from aqueous solutions: a extraction time (stirring rate kept at 1500 rpm), b stirring rate (extraction time kept at 70 min). All samples contained 500 ng L⁻¹ of PAHs and were extracted by a PAL SPME Arrow with a PDMS sorption phase (250 μm × 20 mm, 10.2 μL). Exponential trend lines were added via Origin Pro 2015