IonPacAS9-SC
034656-06
Page 20 of 28
5.5
Varying the Eluent System - 10 mM Borate with Column Purge
A low concentration of borate is used to improve resolution of early eluting peaks. This is particularly beneficial when
quanititating chlorite and bromate at sub-ppm levels in the presence of high amounts of fluoride and chloride. High amounts
of nitrate, phosphate, or sulfate can be rapidly removed from the column using a step change to a higher borate concentration.
Dilute borate eluents are less affected by CO
2
contamination from the air than dilute carbonate eluents. The Thermal Stabilizer
(TS-2, P/N 043117) was incorporated in this analysis for high sensitivity baseline stabilization.
Sample Loop Volume:
50 µL
Analytical Column:
IonPac AS9-SC Analytical Column
Eluent:
10 mM H
3
BO
3
/10 mM Na
2
B
4
O
7
with step change at 15.1 minutes to
Purge:
50 mM H
3
BO
3
/50 mM Na
2
B
4
O
7
Eluent Flow Rate:
2.0 mL/min
SRS Suppressor:
Anion Self-Regenerating Suppressor, ASRS-ULTRA (4-mm)
AutoSuppression Recycle Mode
or MMS Suppressor:
Anion MicroMembrane Suppressor, AMMS III (4-mm)
MMS Regenerant:
25-50 mN H
2
SO
4
Expected Background Conductivity:
3-4 µS
Long-term Storage Solution (> 1 week):
100 mM Sodium Bicarbonate
Short-term Storage Solution (< 1 week):
Eluent
Figure 5
Anion Separation using 10 mM Borate Eluent
with Column Purge after Nitrate
0.0
-0.1
5.0
20.0
μ
S
5
1,2
7
3
4
6
0.0
Minutes
1.0
5.0
10.0
15.0
12
Column Purge
8
9
10
11
Analyte
mg/L
1.
Fluoride
0.5
2.
Iodate
0.1
3.
Acetate
0.1
4.
Formate
0.1
5.
Chlorite
0.2
6.
Bromate
0.2
7.
Chloride
50
8.
Nitrite
0.1
9.
Carbonate
10. Bromide
0.2
11. Chlorate
0.2
12. Nitrate
10
13. Phosphate
0.5
14. Sulfate
60
Содержание 043185
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