The Dionex ADRS 600 and Dionex AERS 500e use water as the regenerant and have the ability to provide continuous suppression. The tables in Dionex IonPac CS12A Analysis of 24% Sulfuric Acid and Optimum current settings for common eluents for Dionex AERS 500 Carbonate (4 and 2 mm) list the eluent concentrations and flow rates of commonly used mobile phases used in anion separations and the optimum / recommended current level to suppress the eluent. The operation of the Dionex ADRS 600 and Dionex ERS 500e requires a constant flow of water over the electrodes in a direction that is countercurrent to the flow of the eluent.

In the AutoSuppression Recycle Mode, the eluent leaving the conductivity cell is recycled through the regenerant chambers as the water supply. This eliminates the need for an external regenerant water supply and delivery system. When the Dionex ADRS 600 or Dionex AERS 500e is operating in this mode, the amount of water flowing through the regenerant chambers is limited to the eluent flow rate. The AutoSuppression Recycle Mode cannot be used with eluents containing any organic solvents.

The AutoSuppression External Water Mode requires an external source of deionized water for the regenerant chambers. When the Dionex ADRS 600 or Dionex AERS 500e is operating in this mode, the amount of water flowing through the regenerant chambers is independent of the eluent flow rate. Because of this, higher regenerant flow rates are achievable. See the following table.

The AutoSuppression External Water Mode is the mode used if organic solvents (up to 40%) are present in the eluent. It eliminates the potential for buildup of contaminating ions resulting from the oxidation of solvents.

Optimum Current Settings for the Dionex ADRS 600 (Legacy Mode) and Dionex ERS 500e in the Auto Suppression Recycle and External Water Modes

Column

Eluent

Eluent Flow Rate (mL/min)

Optimum Current (mA)

(2 mm)

(4 mm)

(2 mm)

(4 mm)

AS4A-SC

1.8 mM CO32- / 1.7 mM HCO3-

0.5

2.0

7

27

AS9-HC

9.0 mM CO32-

0.25

1.0

12

45

AS12A

2.7 mM CO32- / 0.3 mM HCO3-

0.38

1.5

6

22

AS14

3.5 mM CO32- / 1.0 mM HCO3-

0.3

1.2

6

24

AS14A

8.0 mM CO32- / 1.0 mM HCO3-

0.51)

1.0

21

42

AS22

4.5 mM CO32- / 1.4 mM HCO3-

0.3

1.2

8

31

AS23

4.5 mM CO32- / 0.8 mM HCO3-

0.25

1.0

7

25

AS10

80 mM OH–

0.25

1.0

50

198

AS11

12 mM OH–

0.25

1.0

8

30

38.3 mM OH–

0.5

2.0

48

190

AS11-HC

30 mM OH–

0.38

1.5

29

112

60 mM OH–

0.38

1.5

57

223

AS15

38 mM OH–

0.3

1.2

29

113

40 mM OH–

0.51)

 

50

 

AS16

35 mM OH–

0.25

1.0

22

87

55 mM OH–

0.38

1.5

52

204

AS17-C

15 mM OH–

0.25

1.0

10

38

40 mM OH–

0.5

2.0

50

198

AS18

23 mM OH–

0.25

1.0

15

57

39 mM OH–

0.25

1.0

25

97

AS19

20 mM OH–

0.25

1.0

13

50

45 mM OH–

0.25

1.0

28

112

AS20

35 mM OH–

0.25

1.0

22

87

55 mM OH–

0.25

1.0

34

136

AS21

15 mM OH–

0.35

 

13

 

AS24

55 mM OH–

0.30

 

41

 

AS25

36 mM OH–

0.25

1.0

23

92

AS26

55 mM OH–

0.30

1.2

41

164

The Dionex ADRS 500 and Dionex AERS 500e are not compatible with legacy systems that only provide discrete (50, 100, 300 and 500 mA) current settings. For optimum performance, it is recommended to use a Dionex RFC-10 or Dionex RFC-30 power supply to provide fine current control with the optimum setting.

External Water Flow Rates for Dionex ADRS 600 and Dionex AERS 500e (4 and 2 mm)2)

Minimum External Water Flow Rate

Recommended External Water Flow Rate

Maximum External Water Flow Rate

Equivalent to the eluent flow rate

2x the eluent flow rate

2 mL/min (2 mm suppressors)
5 mL/min (4 mm suppressors)