Resilient Vertical Torch Means Less Cleaning, Less Downtime, and Fewer Replacements—Even for Tough Samples

Importance of the Topic

In analytical chemistry high total dissolved solids TDS samples pose challenges for plasma stability and detection limits using ICP OES techniques. Samples such as soil sludges brines and strong acid digests require robust instrumentation that can maintain precision and minimize maintenance under harsh conditions. The development of resilient vertical torch technology addresses these needs by offering improved resistance to high matrices and volatile solvents.

Objectives and Overview of the Article

This article evaluates the performance advantages of vertical torch configurations in the Agilent 5900 and 5800 ICP OES systems. The focus lies on reducing downtime cleaning and torch replacements while maintaining low detection limits and stable long term operation in samples with elevated TDS.

Methodology and Instrumentation

The study compares traditional horizontal and radial torch arrangements with the vertical torch module across different viewing modes. A high solids dual view torch with radial axial and synchronous vertical dual view capabilities was tested. Sample performance was assessed using a 25% sodium chloride solution spiked with a multi element standard over a 9.4 hour period including rinse cycles.

Used Instrumentation

• Agilent 5900 Synchronous Vertical Dual View ICP OES with Dichroic Spectral Combiner
• Agilent 5800 Vertical Dual View and Radial View ICP OES configurations
• Resilient vertical Easy fit torch with automatic alignment and mass flow controllers
• Solid state radio frequency generator operating at 27 MHz with 750 to 1500 W power
• Argon humidifier accessory for improved plasma stability in high chloride matrices

Main Results and Discussion

The vertical torch systems achieved relative standard deviations below 1.6 percent for 14 elements in a 25 percent NaCl spike over 9.4 hours. Stability testing demonstrated exceptional long term precision across elements including Al As Ba Cd Co Cr Cu Mn Mo Ni Pb Se Sr and Zn. The vertical orientation reduced the need for frequent cleaning and replacement compared to high solids horizontal designs.

Benefits and Practical Applications

• Enhanced tolerance to high matrix and volatile organic samples
• Reduced cleaning frequency and instrument downtime
• Extended torch lifetime leading to lower operational costs
• Consistent alignment and reproducible results across operators
• Flexible viewing modes for both low detection limits and high throughput analysis

Future Trends and Opportunities

The integration of advanced torch designs and solid state RF systems paves the way for further automation and miniaturization in ICP OES instruments. Future developments may include adaptive plasma control algorithms and enhanced gas management to support increasingly complex sample matrices. Expanding capabilities in field deployable modules and real time monitoring represent key areas for ongoing innovation.

Conclusion

The resilient vertical torch technology in Agilent 5900 and 5800 ICP OES platforms delivers robust plasma performance for challenging high TDS samples while maintaining precise detection limits. Combined with solid state RF and automated alignment the system reduces maintenance overhead and delivers consistent results. This configuration offers a balanced solution for routine environmental industrial and research laboratories facing demanding sample types.