Agilent V-groove Nebulizer for ICP-OES and MP-AES

Importance of the Topic

The reliability of sample introduction in ICP-OES and MP-AES analyses is critical for high-throughput laboratories. Conventional concentric nebulizers often suffer from blockages when handling samples with high Total Dissolved Solids (TDS) or large particulates, leading to downtime, repeated analyses, and increased operational costs. The Agilent inert V-groove nebulizer addresses these challenges by offering virtually unblockable aerosol generation and improved long-term stability.

Study Objectives and Overview

This application note evaluates the design and performance of the Agilent inert V-groove nebulizer. Key objectives include demonstrating its resistance to blockage, assessing long-term stability with challenging matrices, and comparing its productivity improvements against traditional nebulizer designs. The study covers samples containing up to 30% TDS, large particulates up to 350 µm, and aggressive acid digests such as aqua regia and hydrofluoric acid mixtures.

Methodology and Instrumentation

Analyses were performed on Agilent ICP-OES and MP-AES systems equipped with standard cyclonic or Scott-type spray chambers. The nebulizer employs a precision ceramic V-groove tip and a 1.0 mm internal diameter PEEK sample capillary, separated from a dedicated gas channel. Solution uptake was maintained between 0.04–2.0 mL/min, and nebulizer gas flow ranged from 0.4–1.2 L/min. Long-term aspiration tests used an unfiltered high-TDS black mass digest run continuously for eight hours.

Main Results and Discussion

After eight hours of uninterrupted operation with an unfiltered black mass digest (30% aqua regia), build-up of undigested particulates was observed in the spray chamber, but the V-groove tip remained clear, illustrating its ability to handle large particulates and high TDS without blockage. A six-hour stability trial involving over 1 000 samples of used oil spiked with various elements showed replicate precisions better than 5% RSD. These results confirm that the V-groove design maintains aerosol consistency and reduces maintenance requirements.

Benefits and Practical Applications

• Virtually Unblockable: Handles high TDS and large particulates up to 350 µm.
• Enhanced Productivity: Minimizes pre-filtering, re-analysis, and maintenance downtime.
• Broad Chemical Compatibility: Resistant to HF, aqua regia, organic solvents, and complex digests.
• Easy Integration: Drop-in replacement for conventional inert or glass concentric nebulizers without method changes.
• Cost Efficiency: Reduces running costs by eliminating frequent cleaning and replacement.

Future Trends and Opportunities

Further developments may include integration of the V-groove nebulizer into automated sample handling and hyphenated techniques (e.g., LC-ICP-MS), expansion into extreme matrices such as radioactive or slurry samples, and miniaturization for microflow applications. Ongoing material innovations could further broaden its chemical resistance and durability.

Conclusion

The Agilent inert V-groove nebulizer delivers robust, unblockable performance for demanding ICP-OES and MP-AES analyses. Its parallel-path design and inert materials enable stable, long-term operation with minimal maintenance, significantly improving laboratory efficiency and reducing downtime.