Product Manual for IonPac CS16
Page 34 of 65
5.10.
Analysis of Tap Water at 40 °C
Tap water samples will typically contain high levels of sodium, magnesium and calcium and relatively low levels of other
cations. In the top chromatogram, a weaker 30 mN methanesulfonic acid eluent was used, while the bottom chromatogram
was obtained with the stronger 48 mN methanesulfonic acid eluent. The approximate calculated 300:1 ratio of sodium-to-
ammonium is easy to determine in either case (see peaks 2 and 3).
Column:
IonPac CS16 5-mm Analytical Column (no guard)
Sample Volume:
25 µL Loop
Eluent: See
Chromatogram
Eluent Flow Rate:
1.0 mL/min
Temperature: 40
°C
SRS Suppressor:
Cation Self-Regenerating Suppressor 300 (4-mm) in
AutoSuppression Recycle Mode
or MMS Suppressor:
Cation MicroMembrane Suppressor, CMMS 300 (4-mm)
MMS Regenerant:
TBAOH
MMS Mode:
Displacement Chemical Regeneration (DCR)
Expected Background Conductivity:
< 2 µS
Storage Solution:
Eluent
48 mM Methanesulfonic acid (MSA)
0
5
10
15
20
25
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
5
4
6
3
1
2
0.1
µS
1.0
10
0
15
Minutes
5
20
25
Analyte mg/L
1. Lithium
0.002
2. Sodium
19.73
3. Ammonium
0.065
4. Potassium
0.987
5. Magnesium
7.210
6. Calcium
18.54
where 1 mg/L = 1 ppm
30 mM Methanesulfonic acid (MSA)
0
5
10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
5
4
6
3
1
2
0.1
µS
1.0
10
0
Minutes
5
Analyte mg/L
1. Lithium
0.002
2. Sodium
19.73
3. Ammonium
0.065
4. Magnesium
7.210
5. Potassium
0.987
6. Calcium
18.54
where 1 mg/L = 1 ppm
Figure 19
IonPac CS16 5-mm Analysis of Tap Water
Document No. 031747-05
© 2010 Dionex Corporation
December 2010
