Simultaneous determination of Asulam, Thiophanate-methyl, Siduron, Iprodione

Importance of the topic

Reliable monitoring of pesticide residues is critical for environmental safety, food quality, and regulatory compliance. Asulam, thiophanate-methyl, siduron, and iprodione are widely used agrochemicals requiring sensitive and rapid analytical methods. Simultaneous determination streamlines analysis, reduces solvent consumption, and increases laboratory throughput.

Objectives and study overview

This study presents an optimized reversed-phase liquid chromatography method for concurrent detection of five pesticides. The primary aim is to establish conditions that deliver clear separation, robust quantification, and fast analysis time using Shimadzu systems.

Methodology and instrumentation

• System: Shimadzu Prominence-i
• Column: Shim-pack VP-ODS (150 mm × 4.6 mm I.D., 5 µm)
• Mobile Phase: 50 mM KH₂PO₄ (pH 3.0) / acetonitrile = 55/45 (v/v)
• Flow Rate: 1.0 mL/min
• Column Temperature: 40 °C
• Injection Volume: 10 µL
• Detection: UV at 230 nm for thiophanate-methyl, siduron, iprodione; 270 nm for asulam

Key results and discussion

Baseline separation of all target compounds was achieved within a short runtime. Dual-wavelength detection exploited distinct absorbance maxima, enhancing sensitivity. Calibration curves demonstrated excellent linearity over the tested concentration range (1.0–1.5 mg/L), ensuring reliable quantification. Peak shapes were symmetrical, indicating minimal secondary interactions.

Benefits and practical applications

• Simultaneous analysis reduces total run time and solvent use.
• High sensitivity allows trace-level detection in environmental and food matrices.
• Method adaptability suits routine quality control and research laboratories.

Future trends and possibilities

Advancements may include coupling with mass spectrometry for lower detection limits and improved specificity. Miniaturization of LC systems and adoption of greener solvents can further reduce environmental impact and operational costs.

Conclusion

The developed RP-LC method offers a robust, efficient, and cost-effective approach for simultaneous pesticide analysis, supporting regulatory requirements and quality assurance in various industries.

Reference

Application News L480 (Shimadzu Corporation, Dec. 2021)