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Dissipation of Bifenthrin in Water as Affected by pH and Temperature

机译:pH和温度对联苯菊酯在水中的耗散的影响

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A laboratory experiment was conducted to study the persistence of bifenthrin in water at different pH and temperature conditions. To study the effect of pH, fortified water samples at pH 4.0 (acidic), 7.0 (neutral) and 9.2 (alkaline) were incubated at 25°C. Effect of temperature was studied at 5,25 and 40°C with water samples fortified at 1.0 μg/ml level. Residues were estimated by GLC-ECD at different time intervals. Results revealed that the residues in all the treatments persisted beyond 45 days. Dissipation at different pH revealed that bifenthrin was most stable under alkaline pH followed by neutral and acidic pH. Half-life values at different pH varied from 14.8-42.4 days. Bifenthrin residues dissipated fastest at 40°C (T_(1/2)27.4 days) followed by 25 (T_(1/2)32.4 days) and 5°C(T_(1/2)44.3 days). Dissipation in all cases followed first order kinetics.
机译:进行了实验室实验,以研究联苯菊酯在不同pH和温度条件下在水中的持久性。为了研究pH的影响,将pH为4.0(酸性),7.0(中性)和9.2(碱性)的强化水样品在25°C下孵育。在5.25和40°C下研究温度的影响,以1.0μg/ ml的水平强化水样品。通过GLC-ECD在不同的时间间隔估算残留物。结果显示,所有处理中的残留物持续超过45天。在不同pH下的消散表明联苯菊酯在碱性pH下最稳定,随后在中性和酸性pH下最稳定。在不同pH下的半衰期值为14.8-42.4天。联苯菊酯残留在40°C(T_(1/2)27.4天)消散最快,其次是25(T_(1/2)32.4天)和5°C(T_(1/2)44.3天)消散。在所有情况下,耗散遵循一级动力学。

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