Analysis of Low-Concentration Organophosphorus pesticides

Significance of the Topic

Organophosphorus pesticides are widely used in agriculture but pose significant health and environmental risks even at trace levels. Reliable analytical methods capable of detecting low concentrations are essential for ensuring food safety, environmental monitoring, and regulatory compliance.

Objectives and Study Overview

This application note evaluates the performance of the Shimadzu Nexis GC-2030 system equipped with an FPD-2030 detector in phosphorus mode and an SH-1701 capillary column for the simultaneous analysis of 22 organophosphorus pesticides at trace levels (5 μg/L each).

Methods and Instrumentation

The developed method utilizes high-pressure splitless injection (300 kPa for 1 min) of a 2 μL sample onto an SH-1701 column (30 m × 0.25 mm I.D., 0.25 μm film thickness), with helium as the carrier gas under constant linear velocity mode at 46.8 cm/s. The oven temperature program ramps from 60 °C (1 min) to 180 °C at 20 °C/min, then to 250 °C at 5 °C/min (10 min), and finally to 280 °C at 7 °C/min, completing in 37.4 min. Injector and detector temperatures were set at 260 °C and 300 °C, respectively.

Used Instrumentation

• Gas chromatograph: Shimadzu Nexis GC-2030
• Detector: FPD-2030 in phosphorus mode
• Column: SH-1701, 30 m × 0.25 mm I.D., 0.25 μm film thickness

Main Results and Discussion

The method achieved baseline separation and sensitive detection of all 22 target pesticides at 5 μg/L. The optimized temperature program ensured sharp peaks and efficient resolution within 37.4 min. High-pressure splitless injection enhanced analyte focusing, improving signal intensity, while the phosphorus-mode FPD provided selective detection, minimizing matrix interference.

Benefits and Practical Applications

• Trace-level quantification of organophosphorus pesticides in food, water, and soil samples
• High selectivity and sensitivity for phosphorus-containing analytes
• Robust and reproducible workflow for routine quality control and regulatory monitoring

Future Trends and Opportunities

Advances in automated sample preparation and data processing will increase throughput and reduce manual intervention. Coupling GC-FPD with mass spectrometry could offer confirmatory identification. Development of faster temperature programs and novel stationary phases may further reduce analysis time and improve resolution for emerging pesticide derivatives.

Conclusion

The Shimadzu Nexis GC-2030 system with FPD-2030 in phosphorus mode and SH-1701 column delivers a robust, sensitive, and selective method for the analysis of low-concentration organophosphorus pesticides, supporting compliance with safety standards and regulatory requirements.

Reference

Application News G294 (JP, ENG), Shimadzu Corporation, First Edition: September 2022, ERAS-1000-0314