IonPacAS9-SC
034656-06
Page 17 of 28
5.2
Inorganic Anions Including Chlorate and Chlorite
Separation and elution of anions on the IonPac AS9-SC Analytical Column has been optimized utilizing a carbonate/bicarbonate
eluent. By using this eluent, monovalent and divalent anions can be isocratically separated and quantitated in a single injection.
The carbonate/bicarbonate mixture allows the strength of the eluent, and thus the selectivity of the system to be changed by varying
the HCO
3
-
/CO
3
2-
ratio. Furthermore, the suppressor reaction product is carbonic acid (H
2
CO
3
) and results in a low background
conductivity (14-18 µS) suitable for isocratic analysis. For samples with similar concentrations of ions, the run time can be
decreased to 1/2 the standard run time by doubling the flow rate. For samples with highly variable concentrations, additional
resolution can be obtained at lower flow rates (see Section 4.4, Resolution of Low-Concentration Analytes).
Sample Loop Volume:
25 µL
Analytical Column:
IonPac AS9-SC Analytical Column
Eluent:
1.8 mM Na
2
CO
3
/1.7 mM NaHCO
3
Eluent Flow Rate:
See Chromatogram
SRS Suppressor:
Anion Self-Regenerating Suppressor, ASRS-ULTRA
AutoSuppression Recycle Mode
or AES Suppressor:
Anion Atlas Electrolytic Suppressor, AAES
or MMS Suppressor:
Anion MicroMembrane Suppressor, AMMS III
MMS Regenerant:
25-50 mN H
2
SO
4
Expected Background Conductivity:
12-16 µS
Long-term Storage Solution (> 1 week):
100 mM Sodium Bicarbonate
Short-term Storage Solution (< 1 week):
Eluent
Figure 2
Inorganic Anions including Chlorate, Chlorite and Bromate
Flow Rate = 2.0 mL/min
1
2
3
4
5
6
7
8
9
10
0
5
10
Minutes
-5
15
μ
S
10
5
0
Flow Rate = 1.0 mL/min
1
2
3
4
5
6
7
8
9
10
0
5
10
15
20
-5
15
μ
S
Minutes
10
5
0
Analyte
mg/L
1.
Fluoride
1.0
2.
Chlorite
5.0
3.
Bromate
1.0
4.
Chloride
1.5
5.
Nitrite
5.0
6.
Bromide
15.0
7.
Chlorate
15.0
8.
Nitrate
15.0
9.
Phosphate
20.0
10. Sulfate
25.0
Содержание 043185
Страница 1: ...for IonPac AG9 SC IonPac AS9 SC...
