IonPac CS14 Manual
Doc. No. 034848-10
Page 19 of 54
5.4
Isocratic Elution of Ammonium, Group I & II Cations
Resolution of Group I and Group II Cations (Li
+
, Na
+
, NH
4
+
, K
+
, Rb
+
, Cs
+
, Mg
2+
, Ca
2+
, Sr
2+
, Ba
2+
) is accomplished by isocratic
elution using 10 mM methanesulfonic acid (MSA).
Sample Loop Volume:
4.5 µL (2-mm), 18 µL (4-mm)
Analytical Column:
IonPac CS14 Analytical Column
Eluent:
10 mM MSA
Eluent Flow Rate:
0.25 mL/min (2-mm), 1.0 mL/min (4-mm)
SRS Suppressor:
Cation Self-Regenerating Suppressor, CSRS ULTRA (2-mm or 4-mm)
Recycle Mode
or MMS Suppressor:
Cation MicroMembrane Suppressor, CMMS III (2-mm or 4-mm)
MMS Regenerant:
100 mN TBAOH
(tetrabutylammonium hydroxide)
or AES Suppressor:
Cation Atlas Electrolytic Suppressor, CAES
(up to 25 µeq/min)
Expected Background Conductivity:
< 3 µS
Storage Solution:
Eluent
Figure 3
Isocratic Elution of Ammonium, Group I & II Cations
(Li
+
, Na
+
, NH
4
+
, K
+
, Rb
+
, Cs
+
, Mg
2+
, Ca
2+
, Sr
2+
, Ba
2+
)
Analyte
mg/L
1.
Li
+
1.0
2.
Na
+
4.0
3.
NH
4
+
10.0
4.
K
+
10.0
5.
Rb
+
20.0
6.
Cs
+
20.0
7.
Mg
2+
5.0
8.
Ca
2+
10.0
9.
Sr
2+
3.3
10. Ba
2+
10.0
1 mg/L = 1 ppm
0
10
20
30
μ
S
0
Minutes
1
2
3
4
5
6
5
10
7
8
9
10
