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Dissipation Kinetics and Risk Assessment of Thiamethoxam 25% WG in Chilli, Capsicum annuum L.

Author: Anju Viswanathan K. and Ambily Paul

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Abstract

Dissipation and risk assessment of 25 % thiamethoxam WG in chillies were carried out at the Pesticide Residue Research and Analytical Laboratory, College of Agriculture, Thiruvananthapuram. Since chilli is an important spice crop, it is routinely used in every Indian kitchen on an everyday basis, both directly and indirectly. So, it is very important to identify the amount of contaminants adhered to the product and its safety before consumption. Insecticide residue analysis of thiamethoxam was done, and a residue of 0.17 mg kg-1 was observed on the chilli after two hours of spraying. The residue reached below the limit of quantification on the fifth day after spraying. The risk assessment showed that the theoretical maximum residue contribution (TMRC) value was lower than the maximum permissible intake (MPI) value from the day of spraying, making the product safe for consumption.

Keywords

Thiamethoxam, Chilli, Risk assessment, Insecticide residue, Dissipation, TMRC, MPI, LOQ, LC-MS/MS

Conclusion

On chillies, the thiamethoxam 25 % WG dissipation pattern adhered to first-order kinetics. After spraying, the thiamethoxam residues on the chilli reached below the limit of quantification on the fifth day. The first residue measured out to be 0.17 mg Kg-1. The initial residues decayed at a rate of 47.05 per cent on the first day following spraying, reaching a total of 0.09 mg Kg-1. Given the TMRC readings, it was significantly lower than the MPI measured two hours after the spraying event. Because of this, it was deemed safe to eat on the day it was sprayed. To be more precise, an adult weighing 60 kg can comfortably withstand a consumption of 0.85 µg of thiamethoxam without experiencing a significant risk to their life. All these factors mean that the specific insecticide can be used safely against the sucking pest of chilies at the appropriate level without endangering human health.

References

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How to cite this article

Anju Viswanathan K. and Ambily Paul (2023). Dissipation Kinetics and Risk Assessment of Thiamethoxam 25% WG in Chilli, Capsicum annuum L. Biological Forum – An International Journal, 15(10): 675-678.