Extraction method for determining dinotefuran insecticide in water samples.

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Pesticide Science

Background:

• Dinotefuran, a third-generation neonicotinoid insecticide, effectively targets pests resistant to older pesticides.
• Its high water solubility promotes leaching into soil and water systems, necessitating robust detection methods.
• Existing analytical techniques may not adequately address dinotefuran's presence in aqueous matrices.

Purpose of the Study:

• To optimize and validate a liquid-liquid extraction with low temperature purification (LLE-LTP) method.
• To determine dinotefuran residues in water samples using high-performance liquid chromatography with diode array detection (HPLC-DAD).
• To assess the method's efficiency, accuracy, precision, and stability for environmental analysis.

Main Methods:

• Optimization and validation of liquid-liquid extraction with low temperature purification (LLE-LTP).
• Analysis of dinotefuran residues using high-performance liquid chromatography with diode array detection (HPLC-DAD).
• Evaluation of method parameters including recovery, precision, linearity, detection limits, and matrix effects.

Main Results:

• The optimized LLE-LTP method achieved high analyte recovery (85.44–89.72%) with good precision (RSD <5.8%).
• The method demonstrated selectivity, accuracy, and linearity within the 10.0–210 µg L⁻¹ range.
• Dinotefuran showed significant stability in water in the dark (>130 days) but a shorter half-life (7 days) under sunlight.

Conclusions:

• The LLE-LTP coupled with HPLC-DAD is a simple, efficient, and reliable method for dinotefuran residue determination in water.
• This validated method is suitable for routine environmental monitoring of dinotefuran contamination.
• Understanding dinotefuran's environmental stability is crucial for assessing its persistence and impact.