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Instrument ESI or Reference Ion Assignment Ions APCI 21 [RDX + CH 3 COO] – [M + 59] – ESI Quadrupole 33 [M + 44] – ESI Quadrupole [M + 45] – [RDX + CH 3 COO] – [M + 59] – [M + 75] – 39 [RDX+NO 2 -H] – [M + 45] – ESI Triple quadrupole [RDX+NO 2 +CH 3 O+2H] – [M + 75] – 38 [RDX + CHOO] – [M + 45] – ESI Ion
Adduct ions in LC/MS Mass Spectra of RDX
2 mM ammonium acetate (NH 4 )COOCH 3 5 mM ammonium acetate (NH 4 )COOCH 3 No additive NH 4 HCOO No additive 0.5% ammonium acetate NH 4 CH 3 COO NH 4 OH 1 mM ammonium nitrate
Additive 10 mM ammonium formate 0.5% ammonium hydroxide
Table 6.2 Mobile phase Acetonitrile–water (50:50) Methanol–water (75:25) Methanol–water (50:50) Methanol–water (50:50) Methanol–water (50:50) Acetonitrile Acetonitrile Methanol–water (50:50) © 2004 by CRC Press LLC