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. Author manuscript; available in PMC: 2014 Aug 21.
Published in final edited form as: Analyst. 2013 Jun 18;138(16):4443–4447. doi: 10.1039/c3an00934c

Fig. 2.

Fig. 2

MS spectra (mass range: m/z 200–1000) by Orbitrap and MS/MS spectra (parent ion: m/z 316.1, mass range: 297.0–299.0 and 240.0–242.0) by TSQ for blank paper substrates subject to different treatments. (a) untreated 31 ET paper, (b) 31 ET paper washed with water, (c) 31 ET paper treated with 10−3 M HNO3 aqueous solution and (d) ET paper treated with NaClO aqueous solution (Cl% = 1.5 g/L, pH=12). Paper spray solvent: 90% acetonitrile: 10% water solution; solvent volume: 25 µL; Voltage: 3.5 kV.