Total Petroleum Hydrocarbons

Significance of the topic

The quantification of Total Petroleum Hydrocarbons (TPH) is a cornerstone in environmental monitoring, industrial quality control, and process analytics. It provides a broad assessment of hydrocarbon contamination across defined carbon ranges without requiring detailed speciation. Conventional methods often exceed 30 minutes per run, creating bottlenecks in high-throughput laboratories. Ultra-fast gas chromatography (GC) technology addresses these limitations by delivering rapid, reliable results in under four minutes, thus enhancing operational efficiency and reducing sample backlogs.

Study Objectives and Overview

This application note describes the integration of the CALIDUS™ 101-HT UltraFast GC system for TPH analysis in soil and water extracts. The primary goals are to:

• Demonstrate sub-4-minute GC separation of hydrocarbons from C8 to C44.
• Validate method compatibility with standard extraction techniques (Soxhlet, continuous liquid, SPME).
• Showcase instrument performance, portability, and ease of use in laboratory and field settings.

Methodology and Instrumentation

The analytical workflow comprises:

• Sample Processing Module: Standard split/splitless injection port with syringe-through-septum or autosampler introduction; includes septum purge to eliminate bleed contaminants.
• Programmed Temperature Column Module (PTCM): Houses a MXT-1 High-Temperature Resistively Heated Stainless Steel Capillary Column; operated under precise temperature programming for rapid hydrocarbon separation.
• Data System: Chromperfect® chromatography data system integrated with InfoMetrix® LineUp™ on a Windows PC; automates calculation of TPH concentrations across carbon ranges C8–C44.

Key Results and Discussion

Performance benchmarks highlight:

• Complete chromatographic separation of C5–C44 hydrocarbons achieved in approximately 110 seconds.
• High signal intensity and resolution demonstrated by calibration mixes and real-world gasoline overlays, ensuring robust quantification in complex matrices.
• Instrument footprint of 43 cm (L) × 21.5 cm (D) × 27.9 cm (W) and weight of 9.07 kg enables easy deployment for at-line and field analysis.

These results confirm that the CALIDUS™ 101-HT system offers the fastest TPH analysis in the industry without compromising data quality or reliability.

Benefits and Practical Applications

The ultra-fast TPH method provides:

• Significant reduction in analysis time, raising sample throughput and laboratory efficiency.
• Enhanced flexibility for in-field or transportable testing scenarios.
• Reliable quantification across broad carbon ranges for soil and water monitoring, spill response, and regulatory compliance.

Future Trends and Potential Applications

Advancements likely to shape TPH analysis include:

• Further miniaturization and integration into handheld or autonomous monitoring platforms.
• Coupling with advanced detectors (e.g., mass spectrometry) for improved specificity.
• Artificial intelligence–driven data processing to accelerate decision-making and trend analysis.

Conclusion

The CALIDUS™ 101-HT UltraFast GC system revolutionizes TPH analysis by delivering sub-4-minute runs, high resolution, and portable design. This innovation streamlines environmental and industrial workflows, reduces backlogs, and opens new possibilities for rapid on-site hydrocarbon screening.

References

• EPA Method 8000B: Determination of Volatile Organic Compounds by Gas Chromatography
• EPA Method 8015C: Nonhalogenated Organics by Gas Chromatography
• EPA Method 3540C: Soxhlet Extraction
• EPA Method 3510C: Separatory Funnel Extraction
• EPA Method 3535: Solid-Phase Microextraction (SPME)
• ISO 9377-2: Water Quality – Determination of Hydrocarbon Oil Index – Part 2
• ISO 16703: Water Quality – Determination of Hydrocarbon Oil Index – Separation
• EN 5991/7219: Solid and Sludge Analysis – Hydrocarbons
• Application Note: Total Petroleum Hydrocarbons CALIDUS™ 101-HT UltraFast GC