Buchi Alltech 3300 ELSD - Volatile Mobile Phase Modifiers

BÜCHI Labortechnik AG
www.buchi.com
29
7.3 VOLATILE MOBILE PHASE MODIFIERS
VOLATILE BUFFERS AND
MOBILE PHASE MODIFIE
RS
pKa
pKb
pH Range
BP
MP
Acids
Trifluoroacetic Acid
Formic Acid
Acetic Acid
Carbonic Acid
0.3
3.75
4.75
6.37
13.70
10.25
9.25
7.63
72.4°C
100.7°C
116.0°C
-
Bases
Ammonia
Methylamine
Ethylamine
Triethylamine
9.25
10.81
10.66
11.01
4.75
3.19
3.34
2.99
-33.35°C
16.6°C
-6.3°C
89.3°C
Buffers
Ammonium Formate
Pyridinium Formate
Ammonium Acetate
Pyridinium Acetate
Ammonium Carbonate
(used for reverse phase)
Ammonium Carbonate
3.0-5.0
3.0-5.0
3.8-5.8
4.0-6.0
8.0 (adjusted)
5.5-7.5 and 9.3-11.3
120°C
111°C
Ion
-
Pair Reagents
Pentafluoropropionic Acid
Heptafluorobutyric Acid
Nonafluoropentanoic Acid
Pentadecafluorooctanoic Acid
Tridecafluoroheptanoic Acid
~0.6
~0.6
~0.6
~0.6
~0.6
96-97°C
120°C
140°C
189°C
175°C