Dissipation kinetics and dietary risk assessment of chlorantraniliprole residues in/on garden bean (Lablab purpureus var. typicus) using ultra high-performance liquid chromatography

The aim of the study was to find out the dissipation rate of the chlorantraniliprole residues in garden bean pods. Insecticides were sprayed at the farmers’ holding located at Naraseepuram, Coimbatore during the year 2022 (March to April), and the collected samples were processed and analyzed in the laboratory. An effective modified QuEChERS method was developed and validated to estimate the chlorantraniliprole residues in Ultra High-Performance Chromatography. Good linearity with R2 greater than 0.99 was achieved with the Limit of Quantification as 0.05 mg/kg. The relative standard deviation was below 5% for the recoveries obtained (93.30 to 97.91%). The residues persisted up to 10 and 15 days after treatment for recommended (20 g a.i./ha) and double the recommended doses (40 g a.i./ha), respectively. The half-life of chlorantraniliprole in garden beans was calculated as 2.18 days for recommended dose and 2.89 days for double the recommended dose. Intake of chlorantraniliprole residues through garden beans at either of the doses was found to be safe as the calculated Risk Quotient (RQ) was less than one.