Analysis of GC Multiresidue Pesticide

Significance of the topic

This method is essential for monitoring trace levels of organochlorine pesticides in environmental and food samples, ensuring regulatory compliance and protecting public health.

Objectives and overview of the study

The study presents a comprehensive GC–MS multiresidue analysis of 40 organochlorine pesticides using a Shimadzu GCMS with SH-I-5MS column. It aims to achieve reliable separation, identification and quantification in a single run.

Methodology and instrumentation used

The analysis employed gas chromatography–mass spectrometry under electron ionization conditions with a capillary SH-I-5MS column (30 m×0.25 mm i.d., 0.25 µm). Key parameters included a split injection (1 µL, 1:50, 250 °C injector), helium carrier gas at 1.4 mL/min, and a temperature program from 90 °C (1 min) to 330 °C (5 min) at 8.5 °C/min. The transfer line was set to 290 °C and ion source to 325 °C with a 5 min solvent delay.

Main results and discussion

All targeted analytes, including isomers and degradation products such as DDT, DDE, endosulfan derivatives and mirex, were baseline resolved. The method demonstrated consistent retention time reproducibility and mass spectral confirmation, enabling confident multiresidue screening.

Benefits and practical applications of the method

• High throughput screening of diverse pesticides in a single analysis
• Low detection limits suitable for regulatory monitoring
• Robust identification via mass spectral data
• Applicability to environmental, food and quality control laboratories

Future trends and potential applications

Advancements may include coupling with high-resolution mass spectrometry, automated sample preparation, miniaturized GC systems and online monitoring platforms. Expanding libraries for emerging contaminants and integrating data analytics will further enhance surveillance capabilities.

Conclusion

This GC–MS method provides a robust and efficient approach for multiresidue pesticide analysis, meeting the demands of modern analytical laboratories for sensitivity, selectivity and throughput.