Analysis of VOC in Water using Nexis GC-2030 and Headspace Sampler HS-10

Importance of the Topic

Concerns over organophosphorus pesticide residues in food have intensified due to health risks associated with long-term exposure. High-sensitivity detection techniques are essential for reliable monitoring at trace levels, ensuring compliance with regulatory standards and protecting public health.

Objectives and Study Overview

This study assesses the performance of the Nexis GC-2030 gas chromatograph equipped with the FPD-2030 flame photometric detector for qualitative and quantitative analysis of 22 organophosphorus pesticides. Both high-concentration and trace-level methods are evaluated to demonstrate the system’s versatility in food safety applications.

Used Instrumentation

• Nexis GC-2030 gas chromatograph
• FPD-2030 flame photometric detector (phosphorus mode)
• SH-Rtx-1701 capillary column (30 m × 0.25 mm I.D., 0.25 μm film)
• Helium carrier gas with constant linear velocity control

Methodology

Two analytical workflows were developed:

• High-concentration analysis of a 20 mg/L pesticide mix via split injection (1:20), 1 μL injection volume, column temperature ramp from 60 °C to 280 °C over 50.6 min.
• Trace-level analysis of a 5 μg/L mix using high-pressure splitless injection (300 kPa, 1 min), 2 μL volume, modified temperature program (total 37.4 min) and increased linear velocity (46.8 cm/s).

Injection temperatures ranged from 250 °C to 260 °C, with detector operated at 275 °C–300 °C.

Main Results and Discussion

The high-concentration run achieved clear separation of all 22 target compounds. In trace-level mode, signal-to-noise ratios spanned from 5 (Formothion) to 42 (Ethoprophos, Thiometon), confirming the detector’s capacity to quantify low-μg/L residues with high stability and reproducibility.

Benefits and Practical Applications of the Method

• Superior phosphorus selectivity enhances detection of trace pesticide residues in complex food matrices.
• Robust retention times and peak resolution support accurate qualitative identification and quantification.
• Applicable in regulatory testing, environmental monitoring, and quality control laboratories.

Future Trends and Applications

• Coupling with high-resolution mass spectrometry for broader analyte coverage and confirmatory analysis.
• Automated sample preparation workflows to increase throughput and reduce labor.
• Adaptation of methods to additional pesticide classes and more challenging matrices such as soil or biological samples.

Conclusion

The Nexis GC-2030 with FPD-2030 demonstrates exceptional sensitivity and reliability for both high-level and trace-level determination of organophosphorus pesticides. This validated approach offers a dependable solution for food safety and environmental compliance needs.

Reference

Shimadzu Application News G294: Analysis of Organophosphorus Pesticides Using Nexis GC-2030. First Edition: July 2017.