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. 2015 Dec 29;8(1):10. doi: 10.3390/toxins8010010

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Effects of the PTSPE procedure conditions for recovery of DA (n = 3): (a) the amount of sorbent; (b) the number of aspirationg/dispensing cycles; (c) the concentration of formic acid and (d) the volume of eluent.