Residue behavior, dietary and ecological risk assessment of oxadiazine insecticide indoxacarb in chili and soil under field condition using GC-MS

ABSTRACT

Dissipation behavior and risk assessment of oxadiazine insecticide indoxacarb in chili ecosystem were evaluated to assess its safe use. The gas chromatography-mass spectrometry method was used for the quantification of indoxacarb residue in chili and soil using a modified QuEChERS method. The mean recoveries were obtained in the range of 90.6–103.9% with repeatability and reproducibility of 1.3–5.8 and 2.4–5.4%, respectively. Indoxacarb dissipated with half-life (T_1/2) of 1.4 to 1.5 and 1.5 to 1.6 days for chili and soil, respectively. A pre-harvest interval of 5 days suggested for the consumption of chili fruit at 60 g a.i./ha of indoxacarb 14.5% suspension concentrate. The residue concentrations were reduced in the range of 13.0 to 47.7% from chili fruit using different decontamination practices. The calculated risk quotient of indoxacarb on chili was less than one and the soil ecological risk assessment was found to be low-level risk to earthworms and arthropods at recommended dose.

KEYWORDS:

• Indoxacarb
• GC-MS
• chili
• dissipation
• decontamination
• risk quotient

Acknowledgments

The authors are grateful to the Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, India for providing infrastructural facilities.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Additional information

Funding

The authors have no funding to report.