941 Eluent Production Module

Significance of inline eluent production

Inline preparation of eluents directly within ion chromatography systems ensures consistent concentration, minimizes manual errors and contamination, and stabilizes retention times, which is critical for reliable routine and trace analyses.

Goals and overview of the article

This application note introduces Metrohm’s 941 Eluent Production Module integrated into the 940 Professional IC Vario and 930 Compact IC Flex series. It outlines the system’s design, user benefits, and performance under continuous operation.

Methodology and used instrumentation

The 941 module automates dilution of concentrated eluents with ultrapure water using patented Dosino technology. It interfaces with MagIC Net software for method setup, data logging, and peripheral control. A PURELAB flex 3+ system provides uninterrupted Type I water. Integrated level sensors monitor solution reservoirs and waste canisters. Key connections include USB, MSB for Dosino pumps, and sensor ports.

Main results and discussion

With a 20× dilution factor, two liters of concentrate suffice for a month of uninterrupted operation. A 21-day test with a 250 µg/L multi-anion standard confirmed unprecedented retention time stability. Automation eradicated manual dilution errors and supported consistent, contamination-free measurements.

Benefits and practical applications

• Automated inline eluent generation for stable retention and reliable data
• Flexibility to produce up to four distinct eluents on demand
• Low maintenance and extended unattended operation
• Cost-effective concentrate dilution versus preprepared solutions
• Seamless integration with ultrapure water supply and reservoir monitoring

This solution is ideal for environmental, pharmaceutical, and QA/QC laboratories requiring high-throughput IC analyses.

Future trends and opportunities

Advances will likely involve deeper integration with laboratory automation, real-time monitoring of eluent composition, and AI-driven method optimization. Portable modules and enhanced traceability features will expand applications in field analysis.

Conclusion

Metrohm’s Inline Eluent Production Module, combined with MagIC Net and PURELAB flex 3+, represents a significant step toward fully automated, robust ion chromatography workflows, delivering precision, efficiency, and cost savings.