Determination of 22 Elements Following US EPA Guidelines with a New Megapixel CCD ICP-OES

Significance of the topic

Elemental analysis for environmental samples is essential to protect human health and ecosystems.
High-throughput and precise quantification of trace and major elements facilitates compliance with regulatory standards and reduces operational costs.

Study objectives and overview

This study evaluates the Agilent Vista-MPX simultaneous ICP-OES for determination of 22 US EPA elements under ILM05.0 guidelines. Key goals:

• Simultaneous measurement of all US EPA elements in under 5 minutes per sample
• Full compliance with US EPA ILM05.0 quality control requirements
• Assessment of detection limits, linear dynamic range, stability, interference, and QC protocols

Instrumentation

• Agilent Vista-MPX simultaneous ICP-OES with custom megapixel CCD detector (1.1 million pixels, 177–785 nm coverage)
• Axial viewing configuration
• SPS-5 autosampler and autodiluter for automated dilution of over-range samples
• Three-channel peristaltic pump with Y-piece for internal buffer addition

Methodology

The instrument operated at 1.4 kW RF power with plasma gas flow of 15 L/min and auxiliary gas flow of 1.5 L/min. Samples were introduced via a glass concentric nebulizer with defined stabilization and rinse protocols. The Vista-MPX software MultiCal feature enabled simultaneous wavelength measurement and automatic sensitivity selection. QC templates embedded the required tests as specified in ILM05.0.

Key results and discussion

• All 22 elements achieved instrument detection limits below contract required detection limits (3σ criteria)
• Linear range recoveries were within ±5% at recommended concentrations
• Continuing Calibration Verification over 8 hours remained within ±10% stability limits
• Interference check samples passed US EPA criteria without resorting to inter-element correction factors
• Laboratory control samples, duplicates, and spike recoveries met specified control limits
• Total analysis time per sample was 4 minutes 39 seconds

Benefits and practical applications of the method

The Vista-MPX offers high sample throughput, real-time background correction, and removes the need for internal standards or manual interference corrections. Automated QC workflows streamline method development and ensure regulatory compliance, while online dilution and MultiCal extend the dynamic range and simplify analysis of over-range samples.

Future trends and potential applications

Advancements in megapixel CCD detectors in ICP-OES promise further gains in spectral resolution and throughput. Enhanced software automation, AI-driven method optimization, and remote diagnostics will improve laboratory efficiency. Expansion to additional regulatory frameworks and diverse sample matrices will broaden applicability across environmental, industrial, and clinical sectors.

Conclusion

The Agilent Vista-MPX simultaneously determines 22 US EPA elements in under 5 minutes per sample, fully complying with EPA ILM05.0 protocols. Its robust stability, precision, and automated QC make it an effective solution for high-throughput elemental analysis in regulated environments.

References

• S. Bridger and M. Knowles, A Complete Method for Environmental Samples by Simultaneous Axially Viewed ICP-OES following USEPA Guidelines, Varian at Work #29, January 2000
• US EPA, ILM05.0, Quality Control Requirements for the Determination of Metals and Trace Elements by ICP-OES, 2008