suppressors SRS -ULTRA Self-Regenerating Suppressor

suppressors SRS -ULTRA Self-Regenerating Suppressor The Self- Regenerating Suppressor utilizes AutoSuppression technology to enhance analyte conductivity while suppressing eluent conductivity. This results in a dramatic improvement in analyte detection limits. The ions required for eluent suppression are generated by the continuous electrolysis of water. This means that there are no regenerant solutions to make and no need for off-line regeneration of the suppressor. The delivers ultra-low backgrounds and noise levels for true trace-level, parts-pertrillion performance, together with rugged construction for extended lifetimes. The is designed to operate with the entire line of Dionex ion chromatography equipment. When combined with the revolutionary EG Eluent Generator, it delivers truly automated, minimalmaintenance ion chromatography. The Suppressor Advantage Dionex introduced chemical suppression in 975, thereby bringing ion chromatography to the forefront of modern analytical techniques for inorganic analysis. Chemical suppression greatly enhances signal-to-noise ratio (see Figure ) by: Decreasing background eluent conductivity Increasing analyte conductivity compared with nonsuppressed Eliminating sample counterions A New Era in Suppression The is the latest embodiment of AutoSuppression, a technique that goes beyond the power of classical chemical suppression to combine high performance with unparalleled ease of use. The SRS- ULTRA offers: Superior performance with low background conductivity, low noise, and excellent baseline stability High suppression capacity; compatibility with gradient chromatography Economical, effortless, and maintenance-free operation Fast equilibration and start-up

Eluent (NaOH) Analytical Column Anion Suppressor Sample F -, Cl -, SO - NaF, NaCl Na SO in NaOH H O HF, HCl H SO in H O Without Suppression Counterions 9- Figure. In this example of anion chromatography, the removes sodium ions (and other cations) from the eluent and replaces them with hydronium ions from the water regenerant. These hydronium ions combine with the hydroxyl ions from the eluent to form water, which has very low conductivity compared with the sodium hydroxide eluent. Analyte conductivity is enhanced because the analyte anions associate with the highly conductive hydronium ions. F - Cl - - SO Time With AutoSuppression - Cl - SO F - Column: IonPac AG5, AS5, mm. 7 Eluent: 8 mm Potassium hydroxide for 6 min, from 6 7 min gradient to 5 mm Potassium hydroxide Eluent Source: EG Flow Rate:.5 ml/min Inj. Volume: ml Detection: Suppressed conductivity, ASRS -ULTRA, external water mode Peaks:. Fluoride µg/l (ppb). Glycolate. Acetate 9. Formate 5 8 5. Chloride 6 6. Nitrite 7. Carbonate - 8. Sulfate 9. Oxalate. Bromide 5. Nitrate 5 5. Phosphate 85 Time Economical, Easy to Use, and Maintenance-Free The self-contained operates reliably without routine maintenance or operator intervention. In the AutoSuppression Recycle Mode the uses no chemical regenerants, eliminating preparation time and the handling of corrosive reagents. Rapid Start-up and Equilibration The equilibrates rapidly, thus ensuring fast start-ups and rapid re-equilibration after changing eluents. True Trace-Level Analysis In the AutoSuppression mode, the operates with low noise, drift, and background conductivity. The result is low parts-per-billion detection limits for anions and cations without preconcentration (Figure ). For the highest sensitivity, the should be combined with the EG Eluent Generator, which provides contaminant-free eluents for ion chromatography and therefore lower background conductivity. Figure. The is the perfect complement to the EG Eluent Generator. The A provides highly efficient suppression of the potassium hydroxide eluent in this example of low parts-per-billion anion analysis.

The Perfect Complement for AutoElution The and the EG Eluent Generator are the perfect combination for ultratrace analysis. The EG converts water into ultra-pure eluents for ion chromatography. The EG combined with the permits gradient chromatography for parts-per-trillion analysis with almost no baseline drift and maximum signalto-noise ratio (Figure ). High Efficiency The internal volume of the SRS- ULTRA is exceptionally low (< 5 µl for the -mm suppressor). Because of this, the suppressor maintains the efficiency of high-performance IC columns with minimal peak dispersion. High Capacity The high suppression capacity of the allows the use of high eluent concentrations with highcapacity columns. High-capacity columns can tolerate a much higher analyte load without deterioration of peak shape or loss of resolution. In addition, the linear working range of analyte concentrations is expanded beyond that available without suppression, thus permitting analysis of samples with widely disparate analyte concentrations. Gradient Compatibility The dynamic suppression capacity of the accommodates rapidly increasing eluent gradients, thus maintaining low background conductance with minimal baseline shift. Rugged Design The internal construction of the is shown in Figure. The consists of alternating layers of high-capacity ion-exchange screens and ion-exchange membranes -.5 Column: IonPac AG5, AS5, mm Conc. Column: IonPac AC5 Eluent: Potassium hydroxide: mm from to min, mm to mm from min to min, mm to 6 mm from to 8 min Eluent Source: EG Temperature: C Flow Rate:.5 ml/min Sample Volume: ml, preconcentrated Detection: Suppressed conductivity, A, AutoSuppression Peaks:. Fluoride. µg/l (ppb). Acetate.. Formate.. Chloride. 5. Nitrite. 6. Carbonate 7. Sulfate. 8. Oxalate. 9. Bromide.. Nitrate.. Phosphate. Figure. The A provides exceptionally good signal-to-noise ratios for tracelevel analysis. In this example, baseline noise is approximately ns. Note that the fullscale setting is only.. Ion-Exchange Regenerant Screen Ion-Exchange Membrane Ion-Exchange Eluent Screen Ion-Exchange Membrane Ion-Exchange Regenerant Screen Eluent Flow Figure. Internal construction of the. separating two electrodes. The screens create a convoluted low-volume path for the eluent and provide an ion transport path for the ion-exchange process. Together, the membranes and screens form a rugged, self-contained device that eliminates down-time and maintenance. 5 7 8 9 5 5 6 Regenerant Flow Electrode Gasket Material Electrode 87 695-A

Eluent AutoSuppression Recycle Mode A Eluents: Hydroxide, carbonate/bicarbonate, borate. C A Eluents: Methanesulfonic Eluents: Hydroxide, acid carbonate/bicarbonate, (MSA), sulfuric acid, borate. and < mm DAP HCl. C Eluents: Methanesulfonic acid (MSA), sulfuric acid, and < mm DAP HCl. Detector Cell Recycled to Figure 5. Eluent flow in the AutoSuppression Recycle Mode. After eluent passes through the flow cell to the detector, it is recycled back to the suppressor to be used as regenerant. Eluent AutoSuppression Gas Assisted Recycle Mode Detector Cell 86- Flexibility The is designed for maximum flexibility. Use of the does not restrict the user to one or two columns and eluents. The is compatible with the full range of Dionex ion-exchange columns, gradients, and eluents. Most applications for anion or cation exchange use the economical and easy-to-use AutoSuppression Recycle Mode (Figure 5). The AutoSuppression Recycle Mode can be enhanced with the use of the Gas Assisted Regeneration Kit. This mode reduces the noise for trace-level analysis without the need for external water regenerant. In this mode, gas is added to the conductivity cell effluent before it enters the SRS s Regen In port (Figure 6). Recycled to Helium or Nitrogen A Eluents: Hydroxide, carbonate/bicarbonate, boric acid/tetraborate. C Eluents: Methanesulfonic acid (MSA), sulfuric acid, and < mm DAP HCl. Figure 6. Eluent flow in the AutoSuppression Gas Assisted Recycle Mode. Gas is added to the conductivity cell effluent before it goes into the SRS s Regen In port, significantly reducing the noise for trace-level analysis. 597

Eluents containing up to % organic solvent are suppressed using the AutoSuppression External Water Mode. In this mode the water for electrolysis is supplied from an external source (see Figure 7). The External Water Mode also can be enhanced with the use of the Gas Assisted Mode, which reduces the regenerant flow rate and lowers noise. Figure 8 shows the operation of the SRS in Gas Assisted External Water Mode. The should be operated in the Chemical Suppression Mode (Figure 9) for eluents containing greater than % solvent. suppressors can also be used to suppress eluents for Mobile Phase Ion Chromatography (MPIC ) when the organic solvent content of the eluent remains below %. Eluent Eluent AutoSuppression External Water Mode A & C Eluents: Eluents containing < % organic solvent. AutoSuppression Gas Assisted External Water Mode Detector Cell DI Water Source Figure 7. Eluent flow in the AutoSuppression External Water Mode. The deionized water used for the electrolysis process is supplied from a constant pressure source. This mode is ideal for high-sensitivity operation. Detector Cell 87- Pump DI Water Source Helium or Nitrogen A & C Eluents: Eluents containing < % organic solvent. 597 Figure 8. Eluent flow in the AutoSuppression Gas Assisted External Water Mode. Gas is added to the external water, which is pumped through the SRS at a consistent flow rate between ml/min. Eluent Chemical Suppression Mode Detector Cell Chemical Regenerant A Eluents: Eluents containing > % organic solvent. C Eluents: Eluents containing HCI, DAP HCI, > % organic solvent. 87-A Figure 9. Eluent flow in the Chemical Suppression Mode. The can be operated as a chemical suppressor by using a chemical regenerant. No current is supplied to the SRS.

Column: IonPac AGA, ASA-5µm, ( x 5 mm) Eluent: 8. mm Sodium carbonate,. mm Sodium bicarbonate Temperature: C Flow Rate:.5 ml/min Inj. Volume:.5 µl Detection: Suppressed conductivity, ASRS, AutoSuppression recycle mode Sample: Drinking water from Milpitas, CA Peaks:. Fluoride.6 mg/l. Chloride. Bromide.. Nitrate. 5. Chlorate. 6. Phosphate.5 7. Sulfate 6. Figure. The IonPac ASA column is ideal for interference-free determination of inorganic anions, including fluoride in drinking water. The A is ideal for suppressing carbonate/bicarbonate eluents to a low background conductivity. 5 6 8 7 5 6 6 8 Column: IonPac CGA, CSA, mm Eluent: 8 mm Methanesulfonic acid Eluent Source: EG Flow Rate:. ml/min Inj. Volume: 5 µl 5 6 Detection: Suppressed conductivity, C, recycle mode Peaks:. Lithium.5 mg/l (ppm). Sodium.. Ammonium.5. Potassium 5. 5. Magnesium.5 6 6. Calcium 5. 57B 9 Anion and Cation Suppressors Microbore and Standard Bore Two versions of the are available the Anion Self-Regenerating Suppressor (ASRS -ULTRA) for the determination of anions and the Cation Self-Regenerating Suppressor (CSRS -ULTRA) for the determination of cations. Both the A and the C are available in formats optimized for use with standard bore (-mm) or microbore (-mm or -mm) analytical columns. The reduced internal volume of the -mm version is essential for maximum performance with microbore IC systems using -mm or -mm i.d. columns. Figures through 8 show analyses using the A and the C in - and -mm configurations. Figure. The C is used in Recycle Mode together with the EG for the separation of the common cations. This application requires only DI water for the chromatograph, eliminating corrosive eluents and regenerants.. 5 5 5 Column: IonPac CG5, CS5, mm Eluent: mn Sulfuric acid / 9% Acetonitrile Flow Rate:. ml/min Temperature: C Inj. Volume: 5 µl Detection: Suppressed conductivity, C, external water mode Peaks:. Sodium mg/l (ppm). Ammonium.5. Magnesium. Calcium 5. Unknown 9 Figure. The C is used in the External Water Mode to suppress an eluent containing organic solvent. This separation permits the determination of trace-level ammonium in a wastewater sample containing a high concentration of sodium.

Column: IonPac CGA, CSA, mm Flow Rate:. ml/min 5 6 7 9 8 Eluent: 5 5 Step gradient at 6 min from. mm Methanesulfonic acid /.5% Acetonitrile to. mm Methanesulfonic acid / 5% Acetonitrile; step gradient at min to 6.8 mm Methanesulfonic acid/ 5% Acetonitrile, gradient from to 6 min to 5. mm Methanesulfonic acid/.5% Acetonitrile Inj. Volume: 5 µl Detection: Suppressed conductivity, C, external water mode Temperature: 5 C Peaks:. Lithium.5 mg/l (ppm). Sodium.. Ammonium.5. Potassium 5. 5. 5-Amino--pentanol. 6. Morpholine. 7. -Diethylaminoethanol. 8. Magnesium.5 9. Calcium 5.. Cyclohexylamine 5.. -Dimethylaminopropylamine. 9 Figure. This analysis of cooling water uses simultaneous gradients of acid and acetonitrile at 5 C. The C is used in the External Water Mode to suppress this complex eluent to a stable background. 6 6 8 5 7 9 5 9 7 8 6 5 5 7 6 8 9 Column: IonPac AG-HC, AS-HC, mm Eluent: 5 mm Potassium hydroxide from to min Eluent Source: EG Peaks: Flow Rate:. ml/min Inj. Volume: 5 µl Temperature: C Detection: Suppressed conductivity, A. Quinate mg/l (ppm) 6. Bromide. Fluoride 7. Nitrate. Lactate 8. Malonate 5. Acetate 9. Maleate 5 5. Propionate. Sulfate 5 6. Formate. Oxalate 5 7. Butyrate. Fumarate 5 8. Methanesulfonate. Tungstate 9. Pyruvate. Phosphate. Valerate 5. Pthalate. Monochloroacetate 6. Citrate. Bromate 7. Chromate. Chloride 5 8. cis-aconitate. Nitrite 9. trans-aconitate 5. Trifluoroacetate 9 Figure. The A suppresses the potassium hydroxide used for this separation of 9 anions. Together with the EG Eluent Generator, the A delivers a very stable, noise-free background.

Column: IonPac AG, AS, mm Eluent: mm Potassium hydroxide, 5 mm Potassium hydroxide from to 5 min Eluent Source: EG Flow Rate:. ml/min Detection: Suppressed conductivity, A, recycle mode Peaks:. Chloride mg/l (ppm). Sulfate. Orthophosphate. Pyrophosphate 5. Trimetaphosphate 6. Tripolyphosphate 7. Tetrapolyphosphate Figure 5. The A suppresses the aggressive potassium hydroxide gradient used to separate these polyphosphates, which are found in a wide variety of consumer products. 6 8 Column: IonPac AG6, AS6 Eluent: 5 mm Sodium hydroxide Flow Rate:. ml/min Inj. Volume: µl Temperature: C Detection: Suppressed conductivity, A, recycle mode Peaks:. Fluoride mg/l (ppm). Chloride. Sulfate 5. Thiosulfate 5. Iodide 6. Thiocyanate 7. Perchlorate Figure 6. The A in the External Water Mode is compatible with eluents containing up to % methanol. 5 5 5 6 6 8 6 5 5 7 Column: IonPac NS- µm Eluent: mm Tetrabutylammonium hydroxide, 8% Acetonitrile Flow Rate:. ml/min Inj. Volume: µl Detection: Suppressed conductivity, A, MPIC suppression mode Regenerant: mm Sulfuric acid Peaks:. Propanesulfonate 5 mg/l (ppm). Iodide 5. Thiocyanate 5. Hexanesulfonate 5 Figure 7. The A can suppress eluents used for Mobile Phase Ion Chromatography (MPIC). The Anion MPIC Suppression Mode uses electrolysis augmented by sulfuric acid regenerant to supply the hydronium ions for suppression. Similarly, the C can be used for Cation MPIC. 7 9 8 96 Multiple Operational Modes The simplest way to operate the is in the AutoSuppression Recycle Mode (Figure 5). As the eluent passes through the suppressor to the detector, it is converted to its weakly ionized form. For example, sodium hydroxide is suppressed to water. After passing through the conductivity detector flow cell, the effluent is recycled to the regenerant inlet of the, supplying the with clean water for electrolysis. This mode requires the least day-to-day maintenance and is the operational mode of choice. The amount of deionized water required to operate an SRS suppressor in external water mode can be very expensive and labor-intensive. The SRS is typically operated in this mode when using solvents in eluents and to achieve lowest noise levels. The Gas Assisted Recycle Mode is a new method of SRS operation that replaces the External Water Mode for aqueous eluents when ultra-low noise levels are required. When using the Gas Assisted Regeneration Kit with aqueous eluents, the SRS is operated in Recycle Mode. Gas is added to the conductivity cell effluent before it goes into the SRS s Regen In port. As shown in Figure 8, the SRS Gas Assisted Mode provides the benefit of low noise without the need for external water, significantly reducing water usage and waste. Gas Assisted Recycle Mode reduces peak-to-peak noise from an SRS by a factor of to for anion determinations and a factor of for cations while using the eluent as the source for regenerant. The SRS can still be operated in normal Recycle Mode without replumbing. The SRS Gas Assisted Kit is easy to install as shown in Figure 6. The effluent from the conductivity cell (which is normally connected to the Regen In port under standard conditions) is now connected to a mixing tee. The cell effluent is mixed with gas (nitrogen or helium) at a set pressure of psi in the tee. This generates a gas flow rate of approximately ml/min.

A check valve in the gas line ensures no leakage of liquid back into the gas line. When the gas pressure is turned off, the SRS is automatically operated in normal Recycle Mode. The AutoSuppression External Water Mode (Figure 7) is used for applications requiring organic solvents in the eluent. In this mode, a constant external source of deionized water supplies the water for the electrolysis process. The detector cell effluent is directed to waste. This is the most efficient AutoSuppression mode and also should be used for applications using high concentrations of eluent and to enhance signal-to-noise ratios for trace-level analyses. The External Water Mode can be enhanced with the use of the Gas Assisted Kit. The Gas Assisted External Water Mode is for eluents containing solvent. A pump is used to deliver the external water regenerant at a consistent flow rate between ml/ min. A flow diagram for this mode of operation is shown in Figure 8. Table shows the typical benefits of operating a C in both the Gas Assisted Recycle and Gas Assisted External Water Modes. The background noise when using the Gas Assisted Recycle Mode is reduced from.5 ns/cm to. ns/cm. For the Gas Assisted External Water Mode, the deionized water usage is reduced from. L/ hours to.6 L/ hours. AutoSuppression is not recommended for eluents containing more than % solvent. The Chemical Suppression Mode (Figure 9) requires the use of caustic or acidic regenerants. This mode delivers the maximum signal-tonoise ratio and is required for eluents containing high concentrations of organic solvent. In this mode, a chemical regenerant is pumped through the suppressor either from a pressurized regenerant reservoir (supplied in the MMS /SRS External Regenerant Installation Kit) or from the optional AutoRegen delivery system..8 5 Average noise:.5 ns/cm 6 7 8.8 5 5 5 Column: IonPac AS5, mm Eluent: EG, mm Sodium hydroxide Flow Rate:. ml/min Inj. Volume: 5 µl Detection: Suppressed conductivity, A, gas assisted mode Peaks:. Fluoride 6.6 mg/l (ppm). Chloride.. Carbonate. Nitrite. 5. Sulfate 5. 6. Bromide. 7. Nitrate. 8. Phosphate 5. Figure 8. The EG combined with the SRS Gas Assisted Recycle Mode reduces noise levels, allowing µg/l (ppb) detection of common anions. TABLE BENEFITS OF C GAS ASSISTED REGENERATION MODES Eluent Eluent Regenerant Gas Noise Regenerant Flow Rate Flow Rate Pressure (ns/cm) Water Usage (ml/min) (ml/min) (psi) (L/ hours) mn. ml/min...5 H SO (Recycle) mn. ml/min.. H SO (Recycle) mn. ml/min ml/min..5. H SO / 9% ACN mn. ml/min.5 ml/min.5.6 H SO / 9% ACN 58

Ordering Information To order in the U.S., call -8-6-69 or contact the Dionex regional office nearest you. Outside the U.S., order through your local Dionex office or distributor. Refer to the following part numbers: SRS Self-Regenerating Suppressors A ( mm) Anion Self- Regenerating Suppressor Replaces the ASRS-I (P/N 89) and the ASRS-II (P/N 68). For use with -mm anion-exchange columns... P/N 596 A ( mm) Anion Self- Regenerating Suppressor Replaces the ASRS-I (P/N 87) and the ASRS-II (P/N 678). For use with -mm microbore anionexchange columns... P/N 597 C ( mm) Cation Self- Regenerating Suppressor Replaces the CSRS-I (P/N 9) and the CSRS-II (P/N 679). For use with -mm cation-exchange columns... P/N 598 C ( mm) Cation Self- Regenerating Suppressor Replaces the CSRS-I (P/N 88) and the CSRS-II (P/N 68). For use with -mm microbore cationexchange columns... P/N 599 Suppressors for Mobile Phase Ion Chromatography (MPIC) For ASRS-MPIC: Order the A. Note: The AMMS -ICE Anion MicroMembrane Suppressor cannot be used for Anion MPIC. For CSRS-MPIC: Order the C. MMS/SRS External Regenerant Installation Kit Required for initial installation of the AutoSuppression External Water Mode and the Chemical Suppression Mode. Includes one -L pressurizable regenerant reservoir, one pressure regulator ( psi/ kpa), and all tubing and fittings required to install the for operation in these modes....p/n 88 SRS Gas Assisted Regeneration Kit Required for the initial installation of the Gas Assisted Recycle Mode or Gas Assisted External Water Mode. Contains one pressure regulator (- psi/- kpa), /-8 mixing tee, one check valve, and all tubing and fittings required to install the for operation in these modes....p/n 56886 Upgrading Older Dionex IC Systems with the SRS Controller Module All DX-6, DX-5, and DX- detectors, CDM- and PED- detectors, DX- (model DX -), and DX- IC systems contain builtin control and power supplies for the. Earlier Dionex systems can accommodate operation with the stand-alone SRS Controller Module. When ordering, please indicate that you are upgrading your Dionex system for operation, and order the following module: SRS Controller Module (SRC-) 5/ V. SRS control must be provided by a stand-alone SRS Controller Module for any CDM-, CDM-, PED-, or DX- IC system without built-in SRS control... P/N 77 Spare Parts Backpressure Loop, each For -mm system...p/n 5877 For -mm system...p/n 5878 Syringe,. ml, disposable For flushing the at start-up...p/n 688 Syringe Adapter, female Luer lock, / 8 threads...p/n 5 SRC- Ship Kit Contains all fittings, tubing, and a gas-separator waste tube required for installation of a second SRS- ULTRA on a system... P/N 57 SRS Extension Cable,. m (7 ft) For remote placement of the SRS unit... P/N 5

SPECIFICATIONS Void Volume: SRS ( mm) < 5 µl SRS ( mm) <.5 µl Dimensions (h x w x d): 6 cm x.5 cm x.5 cm (6.6 in. x.8 in. x.7 in.) Weight:. kg ( lb) SRS Controller Module Approximate Current Output Levels: Level : 5 ma Level : ma Level : ma Level : 5 ma Status LEDs: Green Normal operation Red Power shut off by self-diagnostic circuitry Power Requirement: 85 65 V ac, 5/6 Hz Temperature Requirements: C (5 F) Dimensions (h x w x d):.9 cm x 5.7 cm x. cm (5 in. x. in. x 5.5 in.) Weight:.8 kg (.7 lb)

AutoElution, MicroMembrane, MPIC, AMMS, and MMS are trademarks and AutoRegen, AutoSuppression, AMMS, ASRS, CSRS, SRS, Self-Regenerating Suppressor, and IonPac are registered trademarks of Dionex Corporation. Printed on recycled and recyclable paper with soy-based inks. ionex Corporation Dionex Corporation Dionex U.S. Regional Offices Dionex International Subsidiaries 8 Titan Way Salt Lake City Technical Center Sunnyvale, CA (8) 77-85 Austria () 66 5 5 Belgium (5) 8 Canada (95) 8-965 France 9 6 8 Germany 66-99- P.O. Box 6 55 West South, Suite A Westmont, IL (6) 789-66 Italy (6) 66 5 5 5 Japan (6) 6885- The Netherlands (6) Switzerland (6) 5 99 66 United Kingdom (76) 697 Sunnyvale, CA Salt Lake City, UT Houston, TX (8) 87-565 * Designed, developed, and manufactured under an NSAI registered ISO 9 Quality System. 988-6 89-8 Atlanta, GA (77) -8 (8) 77-7 (8) 97-99 Marlton, NJ (856) 596-6 http://www.dionex.com LPN 78-5 6M / Dionex Corporation