Improved productivity for the determination of metals in oil samples with ASTM Method D5185, using the Agilent 5100 Radial View (RV) ICP-OES

Significance of the Topic

Monitoring metal content in lubricating and base oils is crucial for assessing equipment wear, optimizing additive blends and ensuring product quality in petrochemical and industrial settings.

Aims and Overview of the Study

This study evaluates the Agilent 5100 Radial View ICP-OES equipped with SPS 3 and SVS 2+ for rapid multielement analysis of oil samples following ASTM D5185. The focus is on improving throughput, reducing gas consumption and maintaining analytical performance.

Methodology and Instrumentation

The radial view configuration and 27 MHz solid state RF generator enable stable plasma conditions for organic matrices. Automated sample introduction uses the SPS 3 system and SVS 2+ switching valve to minimize uptake, stabilization and washout times. Method parameters include 2s read time, 3 replicates, 10s stabilization and a 0.5mL sample loop. A semi-volatile organics kit with a 1.4mm concentric nebulizer and double-pass cyclonic spray chamber is used. Calibration standards from 0 to 50ppm are matrix matched in 10% oil in kerosene. Wavelengths for 22 elements are selected per ASTM D5185 with MDLs between 0.042 and 4.6mg/kg.

Main Results and Discussion

Linear calibration curves achieved R2 greater than 0.9999 across the range. Method detection limits met ASTM requirements. Spike recovery tests in used engine oil gave recoveries within 90 to 105% for all elements at low and high levels. The analysis cycle time is 30s per sample including rinse, consuming only 9.5L of argon per run. Long term stability over 4h and 500 samples showed RSD below 2% and concentration drift under 4%.

Benefits and Practical Applications

• High throughput analysis with 30s sample cycle and rapid valve switching
• Reduced argon consumption lowers operating costs for large sample batches
• Robust performance for challenging organic matrices without high plasma gas flows
• Intuitive software and plug and play torch design ensure reproducible results

Future Trends and Potential Applications

The integration of automated sample preparation and advanced data analytics will further streamline multielement oil analysis. Emerging miniaturized ICP-OES designs and AI-driven method optimization may expand applications to on-line monitoring in industrial processes and field testing.

Conclusion

The Agilent 5100 RV ICP-OES with SPS 3 and SVS 2+ offers a robust, fast and cost-effective solution for metals determination in oils according to ASTM D5185. It delivers high precision, excellent long term stability and significant argon savings, making it ideal for high throughput laboratories.

References

• ASTM D5185-13 Standard Test Method for Multielement Determination of Used and Unused Lubricating Oils and Base Oils by ICP-AES