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Metrohm AG - 861 Advance Compact IC with Sequential Compression

Year of introduction 1999
Status available
Company Metrohm AG
Categories Chromatography: LC/IC
An innovative step forward in the compact ion chromatography sector: Metrohm introduces the 861 Advanced Compact IC with sequential suppression. With values below 1 µS/cm after suppression, the background conductivity approaches the theoretical limit of 0.05 µS/cm. When running anions, low background conductivity directly relates to very low detection limits, which means the compact ion chromatograph now covers the single-figure ppb range. In short:
  • No injection peak
  • No system peak
  • No interference from carbonate
  • Previously unachieved precision for rapidly eluting anions
  • Significantly improved detection limits
  • Sequential suppression
  • Flexibility of carbonate eluents with the baseline of a hydroxide eluent
  • With the 861 Advanced Compact IC you are experiencing a new type of chromatography: larger peak areas, no injection peak, no carbonate peak, and baseline stability better than anything you have seen up until now.
Compact means that all instrument components can be accommodated in a small housing, i.e. with a small footprint. Everything that is required for state-of-the-art ion chromatography is included in the 861 Advanced Compact IC.
  • <2 ppb detection sensitivity for standard anions
  • Measuring range expanded to 5000 µS/cm
  • Column heating
  • 10-year «MSM II» suppressor warranty
  • Extremely small footprint
  • Analog and digital output
  • CLICK – One-Button IC – the new simple analysis software
  • Low acquisition costs
  • Lowest total cost of ownership
  • Suitable for «MISP» – Metrohm Inline Sample Preparation, for example by dialysis or ultrafiltration
  • Highest Quality «Swiss Made»
  • The 861 Advanced Compact IC needs no gas supply or computer plug-in cards, the only things required are electricity and a connection to the COM port of the PC.
Sequential suppression
The 861 Advanced Compact IC combines the two most effective suppression techniques sequentially into a single instrument: namely, the second generation of the Metrohm Suppressor Module «MSM II» for chemical suppression, which coincides with a completely new development – «MCS», the 853 Metrohm CO2 Suppressor. This combination guarantees an accurate and reproducible analysis while representing an entirely new type of ion chromatography.

The removal of CO2 keeps the carbonate equilibrium from affecting the peak areas: with sample concentration and sample volume being the same, up to 50% larger peak areas and markedly lower detection limits are obtained.
No carbonate peak – this means no bothersome interferences during the quantification of certain analyte anions. For example, on many polystyrene/divinylbenzene columns, chloride and carbonate coelute. The use of the CO2 suppressor eliminates this problem.

The virtual absence of an injection peak improves the determination of rapidly eluting anions such as fluoride. Although excellent separation between the injection peak and fluoride peak is achieved on polyalcohol columns, the use of the CO2 suppressor improves the detection limit even further. As the injection peak is negligibly small, considerably larger sample volumes can be injected.

Applications
The 861 Advanced Compact IC can carry out all applications in the routine IC analysis sector, while its outstanding sensitivity also allows the 861 to be used in the R&D field. Completely integrated within the Metrodata IC Net software, the 861 can be automated extensively, making the instrument available for Metrohm inline sample preparation applications such as dialysis, ultrafiltration and sample preconcentration.

Analysis of inorganic anions in water, soil, drinks, ...
From 5 ppb bromate up to 500 ppm phosphate, whether it be with or without suppression, the 861 Advanced Compact IC determines everything that can be recorded using conductivity: standard anions in wastewater, drinking or surface water, perchlorate in soil eluates, sulfite, sulfate and thiosulfate in the paper industry, chloride, nitrite, nitrate and sulfate in the cooling water of conventional and nuclear power stations, phosphate and citrate in cola drinks, cyanate, azide and even chlorate in explosives. Numerous anion applications for the 861 Advanced Compact IC are available in more than 200 Application Notes.

With sequential suppression, the Advanced Compact IC 861 achieves detection limits ranging from 0.7 to 1.9 ppb for the standard anions – with an injection volume of merely 20 µL.

Analysis of organic anions
The 861 Advanced Compact IC reliably determines water-soluble carboxylic acids with a chain length of up to six carbon atoms, such as short-chain fatty acids, hydroxy fatty acids, dicarboxylic acids as well as weak inorganic acids. The built-in «MSM II», when used for post-column derivatization, significantly increases the detection sensitivity. More than 25 relevant applications can be found in the application section and downloaded from the Info Center.

Cations
The 861 Advanced Compact IC covers a multitude of monovalent and divalent cationic compounds: alkali metals and alkaline earths, ammonium and biogenic amines, heavy and transition metals. This analysis is without post-column reaction, and above all, without chemical suppression. For example, the transition metals can only be determined by conductivity without suppression, that is with a simple but very effective system that can reliably determine even 20 ppb. The field is covered by an ever updated list of more than 60 Application Notes that give an overview of possible applications made readily available for download in the Info Center.

Analysis automation and sample preparation
The 861 Advanced Compact IC can be automated with all Metrohm sample changers. Choosing the right sample changer depends on the type of application and budget:
  • The 813 Compact IC Autosampler is suitable for routine tasks and accommodates a maximum of 36 samples.
The new Advanced IC Sample Processors offer many options:
  • The 838 Advanced IC Sample Processor is freely programmable and handles 148 sample vessels.
  • The 838 Advanced IC Dialysis Sample Processor performs inline dialysis with heavily loaded samples.
  • The 838 Advanced IC Filtration Sample Processor automates filtration.
  • The 838 Advanced IC Dilution Sample Processor dilutes the samples before injection.
In addition, the 861 Advanced Compact IC has eight remote lines available for the direct control of external devices. These could be any configuration of sample changers, valves for step gradients and column switching or sample preparation modules such as dialysis or ultrafiltration. The 861 Advanced Compact IC is completely integrated in the IC Net software, forming part of very intricate and fully automated systems. It can also be combined very easily with other detectors such as UV/VIS, DAD, VA or PAD.
Specifications
  • Compact high-performance ion chromatography system with sequential chemical and CO2 suppression 
  • Built-in 6-way injection valve
  • Low-pulsation serial dual-piston pump, flow range 0.2 to 2.5 mL/min, typical flow range 0.4 to 1.5 mL/min
  • Maximum pressure 35 MPa (350 bar)
  • Pulsation absorber
  • Insulated column compartment
  • Column heating for two separation columns – adjustable between ambient temperature +5 °C and 80 °C
  • Eluent organizer
  • Detector temperature-stabilized to better than 0.01 °C, temperature range 25...45 °C in 5-°C steps, four measuring ranges 0...50 µS/cm, 0...250 µS/cm, 0...1000 µS/cm, 0…5000 µS/cm
  • Metrohm Suppressor Module «MSM II»
  • «MCS» Metrohm CO2 Suppressor
  • Built-in 22-bit A/D converter
  • Analog and digital signal output
  • 8 remote I/O lines for controlling external instruments
  • Software for control and integration
  • Free application updates from the Internet
  • Dimensions in mm (W/H/D) 259/446/355






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