Thermo Scientific IonPac CG16, Руководство по эксплуатации продукта

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Product Manual for IonPac CS16 Page 29 of 65
5.6. Isocratic Elution of Ammonium, Alkali Metals and Alkaline Earth Metals (Li
+
, Na
+
, NH
4
+
,
K
+
, Rb
+
, Cs
+
, Mg
2+
, Ca
2+
, Sr
2+
, Ba
2+
) at 60 °C
The isocratic elution of ammonia plus Group I and Group II cations (Li
+
, Na
+
, NH
4
+
, K
+
, Rb
+
, Cs
+
, Mg
2+
, Ca
2+
, Sr
2+
, Ba
2+
) can
be completed within 20 minutes using a methanesulfonic acid eluent (MSA) at 60 °C. A sulfuric acid eluent should not be
used for the determination of barium. The advantage of the higher capacity of the CS16 for this application is improved
resolution between sodium and ammonium, enabling these two analytes to be present at disparate concentration ratios. Note
that with the higher capacity CS16 column, cesium, a monovalent, elutes after magnesium, a divalent.
Column:
IonPac CS16 3-mm Analytical Column (no guard)
Sample Volume: 25 µL Loop
Eluent: 36 mM Methanesulfonic acid (MSA)
Eluent Source: EG40
Eluent Flow Rate: 0.5 mL/min
Temperature: 60 °C
SRS Suppressor: Cation Self-Regenerating Suppressor 300 (2-mm) in
AutoSuppression Recycle Mode, (suppressor placed outside the oven)
or MMS Suppressor: Cation MicroMembrane Suppressor, CMMS 300 (2-mm)
MMS Regenerant: TBAOH
MMS Mode: Displacement Chemical Regeneration (DCR)
Expected Background Conductivity: < 2 µS
Storage Solution: Eluent
0 5 1 0
Minutes
15 20 25
0 . 1
4 . 5
µ S
1
3
4
5
6
7 8
9
1 0
2
Analyte mg/L
1. Lithium 0.1
2. Sodium 0.4
3. Ammonium 0.5
4. Potassium 1.0
5. Rubidium 5.0
6. Magnesium 0.5
7. Cesium 5.0
8. Calcium 1.0
9. Strontium 5.0
10. Barium 5.0
where 1 mg/L = 1 ppm
Figure 14
IonPac CS16 Isocratic Elution of
(Li
+
, Na
+
, NH
4
+
, K
+
, Rb
+
, Mg
2+
, Cs
+
, Ca
2+
, Sr
2+
, Ba
2+
)
Document No. 031747-05 © 2010 Dionex Corporation December 2010