Analysis of Lubricant Oil Samples in Compliance with ASTM D7500 Using the Shimadzu Simulated Distillation Gas Chromatograph System

Significance of the Topic

Simulated distillation GC according to ASTM D7500 provides an accurate assessment of boiling point distributions for base and lubricant oils. This method is widely used in industrial quality control, research, and environmental compliance to ensure product consistency and performance.

Goals and Study Overview

The study evaluates the Shimadzu GC-2010 Plus AF system equipped with LabSolutions Distillation GC Analysis software to demonstrate compliance with ASTM D7500. It focuses on calibration using standard paraffin mixes and analysis of a construction equipment lubricant, assessing precision and software capabilities.

Methodology and Instrumentation

• Gas chromatograph: Shimadzu GC-2010 Plus AF
• Injection: On-column OCI/PTV-2010, auto injector AOC-20i, 1 µL volume
• Column: UA-SIMDIS (HT) 0.53 mm × 5 m, 0.1 µm film thickness
• Temperature program: 35 °C initial, ramp 10 °C/min to 440 °C (4.5 min hold)
• Carrier gas: Helium at 35 mL/min
• Detector: FID at 450 °C with makeup gas 30 mL/min (N₂), H₂ 40 mL/min, air 400 mL/min

Main Results and Discussion

Calibration with n-C12 to n-C28, C40, Polywax 655, and n-C110 standards produced distinct peaks across the programmed temperature range. The lubricant oil sample showed clear IBP and FBP values. Five replicate analyses of reference oil 5010 yielded an average FBP of 643.4 °C with an RSD of 0.096%, demonstrating excellent repeatability. Overlaid distillation characteristic curves confirmed consistent performance. LabSolutions software allows simultaneous comparison of up to 16 curves, facilitating routine quality checks.

Benefits and Practical Applications

• High precision in determining high-boiling components
• Full compliance with ASTM D7500 for lubricant and base oil testing
• Streamlined data management and curve comparison in LabSolutions
• Suitable for industrial QC, research laboratories, and regulatory testing

Future Trends and Opportunities

Emerging developments may include tighter integration with LIMS platforms, automated sample preparation, advanced stationary phases for broader temperature ranges, and application of machine learning for predictive distillation modeling. Miniaturized GC modules and novel detectors could further expand analytical capabilities and field deployment.

Conclusion

The Shimadzu GC-2010 Plus AF coupled with LabSolutions Distillation GC Analysis software effectively meets ASTM D7500 requirements, offering reliable, repeatable boiling point distributions for lubricant oils. Its robust performance and user-friendly operation support diverse analytical needs in both industrial and research settings.