Agilent ICP-MS Journal (February 2010 – Issue 41)

Importance of the Topic

ICP-MS is a cornerstone technique in analytical chemistry for sensitive multi-element quantification, interference removal and speciation analysis. Its robustness and adaptability are vital for pharmaceutical quality control, clinical diagnostics and nutritional bioavailability studies.

Objectives and Overview

The key aims covered in this issue include:

• Validating analyte identification using qualifier isotopes in He mode on the Agilent 7700x.
• Preparing pharma laboratories for upcoming USP <232> and <233> standards on elemental impurities.
• Developing a high-throughput method for lead in whole blood with the 7500cx and ISIS-DS.
• Implementing simultaneous speciation of Fe, Zn, S and P using the 7500ce with O₂/He in the ORS.
• Issuing a call for papers for the 2nd Edition of the Speciation Handbook and noting consumables price reductions.

Methodology and Instrumentation

• Agilent 7700x ICP-MS with third-generation Collision/Reaction Cell in He mode for universal polyatomic interference removal and qualifier ion validation.
• Agilent 7500cx ICP-MS coupled to ISIS-DS for discrete sampling in whole blood lead analysis following CADPH protocols.
• Agilent 7500ce ICP-MS in ORS with O₂/He gas mixture for multi-element speciation, hyphenated to SEC for cereal grain extracts.
• Software environment supporting 21 CFR Part 11 compliance via Agilent OpenLab ECM.

Main Results and Discussion

• Qualifier Ion Strategy: He mode on the 7700x achieved RPDs below 3% for Cu and Cr isotope pairs across ten complex matrices, whereas no-gas and H₂ modes showed RPDs up to 915% due to residual interferences.
• Pharma Applications: ICP-MS surpasses ICP-OES in sensitivity for Class 1 (As, Cd, Hg, Pb) and Class 2 impurities, supporting USP’s performance-based methodology and risk-based testing.
• Whole Blood Lead Analysis: The 7500cx with ISIS-DS enabled 52 s sample throughput, an on-instrument detection limit of 5.4×10⁻⁴ µg/dL, stable internal standard recoveries (85–105%) over 300+ samples at 50× dilution.
• Multi-Element Speciation: ORS O₂/He facilitated detection of ³²S¹⁶O⁺, ⁵⁶Fe¹⁶O⁺ and ³¹P¹⁶O⁺, lowering LODs for S (3 µg/L) and Fe (0.5 µg/L), and enabling accurate profiling of Fe-phytate and Zn-protein complexes in grains.

Benefits and Practical Applications

• Enhanced data quality in complex matrices via universal He-mode interference removal and qualifier isotope confirmation.
• Regulatory compliance and method flexibility for elemental impurity testing in pharmaceuticals (USP <232>/<233>).
• High-throughput, low-detection clinical assays for blood lead screening.
• Advanced speciation workflows for nutritional research and plant breeding programs targeting bioavailable mineral forms.

Future Trends and Opportunities

• Growth of hyphenated techniques (LC-ICP-MS, GC-ICP-MS, CE-ICP-MS, A4F-ICP-MS) for nanomaterials and complex biopolymers.
• Second edition of the Speciation Handbook to include emerging applications and novel separation strategies.
• Ongoing consumable pricing optimizations and strategic partnerships to widen ICP-MS accessibility.
• Expanded use of ORS gas chemistries and qualifier ion approaches for multi-technology platforms.

Conclusion

Agilent’s ICP-MS platforms deliver robust interference control, superior sensitivity and high sample throughput, addressing evolving regulatory requirements and enabling cutting-edge research from pharmaceutical QC to nutritional speciation studies.

References

1. Bandura W. – Anal. Chem., 74, 1497–1502 (2002).
2. Persson D.P. et al. – Metallomics, 1, 418–426 (2009).
3. Raboy V. – Phytochemistry, 64, 1033–1043 (2003).
4. Welch R.M. & Graham R.D. – Field Crops Res., 60, 1–10 (1999).
5. Lee Y. et al. – Proc. Natl. Acad. Sci. U.S.A., 106(51), 22014–22019 (2009).