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[Method-performance studies of notified analytical method for chinomethionat]
K Sasaki1, T Tatsuno, M Nakamura
1National Institute of Health Sciences: 1-18-1, Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan.
Summary
This study validated a revised analytical method for detecting chinomethionat in agricultural products. The method demonstrated high recovery rates and reliable precision across multiple crops, ensuring accurate residue analysis.
Area of Science:
- Agricultural Chemistry
- Analytical Chemistry
- Food Safety
Background:
- Chinomethionat is a pesticide used in agriculture.
- Accurate analytical methods are crucial for monitoring pesticide residues in food.
- A revised analytical method for chinomethionat required validation.
Purpose of the Study:
- To evaluate the performance of a revised analytical method for chinomethionat.
- To determine the method's accuracy and precision in agricultural products.
- To establish detection limits for chinomethionat analysis.
Main Methods:
- An interlaboratory study involving six laboratories.
- Analysis of five different agricultural products (rice, cabbage, squash, lettuce, orange).
- Spiking samples with a known concentration of chinomethionat (0.1 µg/g).
Main Results:
- Mean recovery rates ranged from 90.2% to 100.5% across the tested crops.
- Repeatability relative standard deviations were between 4.4% and 7.7%.
- Reproducibility relative standard deviations ranged from 10.9% to 17.1%.
Conclusions:
- The revised analytical method for chinomethionat is suitable for agricultural products.
- The method exhibits good recovery and acceptable precision for residue determination.
- Established detection limits are sensitive enough for regulatory monitoring.