Separation of Eighteen Pesticides Using Accucore RP-MS HPLC Column

Importance of the Topic

Environmental monitoring of pesticide residues in water sources is essential due to increased pesticide use and strict regulations such as DIN38-407 F12. Rapid, reliable chromatographic methods support compliance, protect public health, and guide environmental risk assessments.

Objectives and Study Overview

This application note demonstrates the separation of eighteen common pesticides using a Thermo Scientific Accucore RP-MS HPLC column. The primary goal is to achieve baseline resolution in under fifteen minutes while evaluating performance across multiple flow rates.

Methodology and Instrumentation

The method employs Core Enhanced Technology particles (2.6 µm core–shell) in a 150 × 2.1 mm Accucore RP-MS column. A water–acetonitrile gradient was applied at flow rates of 400, 700, and 1000 µL/min. Column temperature was maintained at 50 °C, injections were 2 µL in partial loop mode, and detection was performed with a UV detector at 230 nm. Sample preparation involved a 1:1 dilution of a pesticide standard mixture in water.

Instrumentation Used

• Thermo Scientific Accela UHPLC system
• Accucore RP-MS 2.6 µm, 150 × 2.1 mm column
• UV detector set at 230 nm

Main Results and Discussion

At 400 µL/min, all eighteen pesticides eluted between 2 and 15 minutes with baseline resolution. Critical pairs such as diuron/isoproturon were fully resolved. Retention time reproducibility showed relative standard deviations below 0.3%. Increasing flow to 1000 µL/min reduced total run time to 11 minutes with only minor efficiency loss.

Benefits and Practical Applications

• High sample throughput with sub-15-minute analyses
• Lower backpressure compared to sub-2 µm columns
• Compatibility with both conventional HPLC and UHPLC systems
• Enhanced resolution for challenging pesticide pairs

Future Trends and Possibilities

Advances in high-pressure instrumentation will further shorten analysis times. Core–shell column technology can be extended to other analyte classes, and coupling with mass spectrometry will enhance selectivity and sensitivity in complex matrices.

Conclusion

Accucore RP-MS columns deliver rapid, high-resolution separation of multiple pesticides, improving laboratory efficiency without compromising performance. Their robustness and versatility make them a valuable tool for routine environmental analysis.