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Development and validation of a rapid analytical method to quantify naled residue
1John A. Mulrennan, Sr. Public Health Entomology Research and Education Center, Florida A&M University, Panama City 32405, USA.
Journal of the American Mosquito Control Association
|January 24, 2002
Summary
A new gas chromatography method accurately detects naled pesticide residues. Naled degrades quickly in the environment but remains stable in hexane solvent for storage.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Pesticide Science
Background:
- Thio-organophosphate pesticides like naled are widely used for mosquito control.
- Accurate detection methods are crucial for environmental monitoring and risk assessment.
- Previous methods may lack the sensitivity or speed required for rapid field analysis.
Purpose of the Study:
- To develop and validate a rapid gas chromatographic method for naled residue detection.
- To assess the stability of naled under various storage conditions.
- To evaluate the method's performance in field studies for environmental monitoring.
Main Methods:
- Gas chromatography with a DB-5 capillary column and thermionic specific detector.
- Direct injection analysis with a limit of detection at 0.01 microg/ml.
- Laboratory and field studies involving filter paper and acrylic yarn sampling.
Main Results:
- Over 90% recovery of naled was achieved using the developed method.
- Naled demonstrated rapid environmental degradation but stability in hexane solvent at 4°C and 23°C for 7 days.
- Field studies showed variable spike recovery on filter paper (31-49%) but high recovery on yarn (93%).
Conclusions:
- The developed gas chromatographic method is effective for detecting naled residues.
- Naled's environmental persistence is limited, necessitating timely monitoring.
- Acrylic yarn proved to be a suitable matrix for collecting naled samples in field applications.