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ESI / APCI Adduct Ion Calculator
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Ion Name
Ion Mass
Charge
Adduct Ion Mass
▲(M+ : Adduct)
1. Positive-Ion Mode
M+H
M + 1.007276
1+
M+NH4
M + 18.033823
1+
M+Na
M + 22.989218
1+
M+CH3OH+H
M + 33.033489
1+
M+K
M + 38.963158
1+
M+ACN+H
M + 42.033823
1+
M+2Na-H
M + 44.971160
1+
M+ACN+Na
M + 64.015765
1+
M+2K+H
M + 76.919040
1+
M+DMSO+H
M + 79.02122
1+
M+2ACN+H
M + 83.060370
1+
2M+H
2M + 1.007276
1+
2M+NH4
2M + 18.033823
1+
2M+Na
2M + 22.989218
1+
2M+3H2O+2H
2M + 28.02312
2+
2M+K
2M + 38.963158
1+
2M+ACN+H
2M + 42.033823
1+
2M+ACN+Na
2M + 64.015765
1+
2. Negative-Ion Mode
▲(M- : Adduct)
M-H
M – 1.007276
1-
M+Na-2H
M + 20.974666
1-
M+Cl
M + 34.969402
1-
M+K-2H
M + 36.948606
1-
M+HCOOH-H
M + 44.998201
1-
M+CH3COOH-H
M + 59.013851
1-
M+Br
M + 78.918885
1-
M+TFA-H
M + 112.985586
1-
2M-H
2M – 1.007276
1-
2M+HCOOH-H
2M + 44.998201
1-
2M+CH3COOH-H
2M + 59.013851
1-
3M-H
3M – 1.007276
1-
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