Page 294 - Advances in Forensic Applications of Mass Spectrometry - Jehuda Yinon

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Figure 6.19 Full scan positive-ion ESI mass spectra at heated capillary of 100 o
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C, of (a) 1 mM NH 4 NO 3 , (b) 1 mM NH 4 NO 3 , (c) 1 mM NH 4 NO 3 and (d) 1 mM
NH 4 N O 3 in methanol–water (50:50) introduced by syringe pump infusion. (From
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Zhao, X. and Yinon, J., Characterization of ammonium nitrate by electrospray
ionization tandem mass spectrometry, Rap. Comm. Mass Spectrom., 15, 1514,
2001. © John Wiley & Sons Ltd. Reproduced with permission).
Chloride adduct ion formation for a series of explosives was investigated
in negative-ion APCI-MS, using a Finnigan LCQ ion trap mass spectrome-
41
ter. Chloride adduct ion formation was studied in 5-nitro-2,4-dihydro-3H-
1,2,4-triazol-3-one (NTO), nitroguanidine (NQ), RDX, HMX, 2,4,6,8,10,12-
hexanitro-2,4,6,8,10,12-hexazaisowurtzitane (CL-20), TNT, tetryl, and
PETN. Limits of detection obtained were 40, 60, 12, 52, 10, 19, 25, and 12
ppb, respectively.
A Finnigan LCQ ion trap mass spectrometer was used to study the ESI
mass spectra of RDX and its degradation products MNX and TNX, as well
38
as HMX, TNB, TNT, DNT, and 2-A-4,6-DNT in ground water. Solid phase
extraction (SPE) cartridges were used to concentrate samples. HPLC sepa-
ration was achieved with a Kromasil C8 reversed-phase column (250 ¥ 2 mm
ID), using an isocratic mobile phase of isopropanol–water–ammonium

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