Dissipation kinetics of co-formulation with two herbicides, clodinafop-propargyl and oxyfluorfen, in/on onion (Allium cepa) samples

• Published in: Environmental science and pollution research international 2023-04, Vol.30 (17), p.50225-50233
• Main Authors: Litoriya, Nitesh S., Chauhan, Nirmal R., Kalasariya, Ravi L., Parmar, Kaushik D., Chawla, Suchi, Parmar, Ambalal V., Raj, Pratik V., Shah, Paresh G.
• Format: Article
• Language: English
• Subjects: Allium cepa; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; bulbs; Dissipation; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; green onions; Half-Life; harvest date; Harvesting; Herbicides; Herbicides - analysis; Kinetics; Onions; Onions - chemistry; oxyfluorfen; Pesticide Residues - analysis; Pesticides; Quantitation; Research Article; Residues; Seasons; soil; Soil - chemistry; Soil Pollutants - analysis; Soils; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 1614-7499; 0944-1344; 1614-7499
• DOI: 10.1007/s11356-023-25785-0

Supervised field trail on dissipation of co-formulation with herbicides clodinafop-propargyl and oxyfluorfen in spring onion showed similar pattern of dissipation during two different seasons. Residues of clodinafop-propargyl reached ≤ limit of quantitation (LOQ, 0.05 mg kg −1 ) on 3rd day after application at both standard and double dose during both the seasons. Oxyfluorfen residues followed first-order kinetics in both the doses during first season with half-life of 0.81 to 3.14 days. The residues of clodinafop-propargyl were detected in soil at both the doses during first season. However, residues were ≤ LOQ (0.05 mg kg −1 ) during second season. The residues of oxyfluorfen were detected only in double dose during first season in soil. In all other cases and in onion bulb, residues were ≤ LOQ (0.05 mg kg −1 ) at the time of harvest. As the residues were either ≤ LOQ (0.05 mg kg −1 ) on 3rd day or have a half-life of 3.14 days, the co-formulation can be used safely, provided a pre harvest interval (PHI) of 3 days is followed. On the basis of maximum residue limits (MRLs) in other commodities and from the data of present study, a default MRL of 0.05 mg kg −1 is proposed for both the pesticides.