Saha Suman, Majumder Sambrita, Das Sushovan, Das Tapan Kumar, Bhattacharyya Anjan, Roy Sankhajit
Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, 741252, India.
Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, West Bengal, 741235, India.
Bull Environ Contam Toxicol. 2018 Apr;100(4):548-552. doi: 10.1007/s00128-018-2269-9. Epub 2018 Feb 9.
A laboratory experiment was conducted to investigate the effect of pH on the persistence and the dissipation of the new readymix formulation of bispyribac sodium and metamifop. The experiment was conducted in water of three different pH viz. 4.0, 7.0 and 9.2. The spiking level of both the compounds in water was 1.0 and 2.0 µg/mL. The residues were extracted by a simple, quick and reliable method and quantified by liquid chromatography tandem mass spectrometry (LC-MS/MS). The method was justified based on the recovery study, which was > 85%. The dissipation of both compounds followed first order kinetics. The half-life values ranged between 19.86-36.29 and 9.92-19.69 days for bispyribac sodium and metamifop, respectively. The pH of water has a prominent effect on degradation of both the compounds. The rate of dissipation of both the compounds was highest in water of acidic pH followed by neutral and alkaline pH.
进行了一项实验室实验，以研究pH值对双草醚与双唑草酮新预混制剂的持久性和消散的影响。实验在三种不同pH值的水中进行，即4.0、7.0和9.2。两种化合物在水中的加标水平均为1.0和2.0μg/mL。通过一种简单、快速且可靠的方法提取残留物，并通过液相色谱串联质谱法（LC-MS/MS）进行定量。该方法基于回收率研究得到验证，回收率>85%。两种化合物的消散均遵循一级动力学。双草醚和双唑草酮的半衰期值分别在19.86 - 36.29天和9.92 - 19.69天之间。水的pH值对两种化合物的降解有显著影响。两种化合物在酸性pH值的水中消散速率最高，其次是中性和碱性pH值的水。
