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Subject: Chemistry × Author: Devrath, Anil × End date: 2021 × Start date: 2021 ×
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    ThesisItemOpen Access
    Dissipation kinetics and leaching potential of pinoxaden in soils of punjab
    (Punjab Agricultural University, Ludhiana, 2021) Devrath, Anil; Pervinder Kaur
    The present study investigates the degradation and leaching potential of pinoxaden in soils under laboratory conditions. Soil samples were treated with pinoxaden at application rates of 25, 50, 100 and 150 g ha-1. Soil type, application rate and temperature had a great influence on degradation rate of pinoxaden. Pinoxaden residues were extracted by ultrasonic assisted extraction (UAE) and salting out liquid liquid extraction (SALLE) from soil and water, respectively and quantified using HPLC-UV. Average recoveries of pinoxaden ranged from 84.9 to 102.6% and 86.6 to 103.9% from soil and water, respectively. Limit of detection (LOD) and limit of quantification (LOQ) were 0.0026 µg mL-1 and 0.008 µg mL-1, respectively. Degradation of pinoxaden followed first order kinetics with half- lives varying from 51.09 to 66.98 hours in studied soils. Degradation increased with increase in temperature and varied from 51.09 to 63.38, 41.18 to 66.98 and 22.85 to 55.72 hours at 5±2, 15±2 and 25±2°C, respectively. Leaching potential of pinoxaden was investigated in loamy sand, sandy loam and clay loam at application rates of 25, 50, 100 and 150 g ha-1 with rainfall equivalent to 150 and 300 mm. No residues of pinoxaden were detected from the different depths at 25 and 50 g ha-1 in loamy sand, sandy loam and clay loam soil at 150 and 300 mm rainfall simulation. However, residues of pinoxaden at higher application rates 100 and 150 g ha-1 varied from 0.011 to 0.015 and 0.012 to 0.016 μg g ha-1 at 150 and 300 mm simulated rainfall. Pinoxaden was not detected in leachates collected from soil columns at 150 and 300 mm simulated rainfall.