Direct Spectrofluorimetric Method for Analysis of Bifenthrin and Resmethrin Pyrethroid Insecticides in Senegalese...

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Agricultural Science

Background:

• Pyrethroid insecticides bifenthrin (BIF) and resmethrin (RES) are used in Niayes agriculture.
• Monitoring these pesticides in water sources is crucial for environmental safety.

Purpose of the Study:

• To develop and validate a sensitive analytical method for BIF and RES in surface and groundwater.
• To assess the method's performance, including sensitivity, precision, and accuracy.

Main Methods:

• Optimization of pH and methanol concentration for pesticide analysis.
• Establishment of calibration curves and determination of linearity.
• Calculation of Limit of Detection (LOD) and Limit of Quantitation (LOQ).
• Assessment of interday and intraday precision, recovery rates, and interference studies.

Main Results:

• Optimal analysis conditions identified as pH 7 and 20% methanol in water.
• Higher fluorescence intensity observed in H₂O-MeOH solvent for both BIF and RES.
• Method demonstrated high sensitivity with low LOD and LOQ values.
• Satisfactory recovery rates (96.2-103.7%) and high precision (intraday <5%, interday 1.8-4.3%) were achieved.
• The method proved robust against interference.

Conclusions:

• A reliable and sensitive analytical method for bifenthrin and resmethrin in water samples was successfully developed.
• The method is suitable for monitoring pyrethroid insecticide contamination in agricultural water environments.
• The validated method ensures accurate and precise quantification of these pesticides.