Department of Instrumental Analysis, University of Lodz, Pomorska 163, 90-236 Lodz, Poland.
Environ Monit Assess. 2012 Nov;184(11):6575-82. doi: 10.1007/s10661-011-2442-7. Epub 2011 Nov 15.
The pesticide diazinon was determined in its insecticidal formulations by square wave adsorptive stripping voltammetry. The method of its determination is based on the irreversible reduction reaction at the hanging mercury drop electrode. The optimal signal was detected at -1.05 V vs. Ag/AgCl in Britton-Robinson buffer at pH 4.4. Various parameters such as pH, buffer concentration, frequency, amplitude, step potential, accumulation time, and potential were investigated to enhance the sensitivity of the determination. The highest response was recorded at an accumulation potential -0.4 V, accumulation time 60 s, amplitude 75 mV, frequency 100 Hz, and step potential 5 mV. The pesticide electrochemical behavior was considered under experimental conditions. The electroanalytical procedure enabled diazinon determination in the concentration range 4.0 × 10(-8)-3.9 × 10(-7) mol L(-1) in supporting electrolyte. The detection and quantification limit were found to be 1.1 × 10(-8) and 3.7 × 10(-8) mol L(-1), respectively. The method was applied successfully in the determination of the active ingredients in the insecticidal formulations Diazinon 10GR and Beaphar 275.
利用方波吸附溶出伏安法测定了杀虫剂二嗪农在其杀虫配方中的含量。该方法的测定基础是在悬汞电极上发生的不可逆还原反应。在 pH 值为 4.4 的 Britton-Robinson 缓冲液中，在相对于 Ag/AgCl 为-1.05 V 的条件下检测到最佳信号。考察了各种参数，如 pH 值、缓冲液浓度、频率、幅度、阶跃电位、积累时间和电位，以提高测定的灵敏度。在-0.4 V 的积累电位、60 s 的积累时间、75 mV 的幅度、100 Hz 的频率和 5 mV 的阶跃电位下，记录到最高响应。在实验条件下考虑了农药的电化学行为。在支持电解质中，该电化学分析程序能够在 4.0×10(-8)-3.9×10(-7)mol L(-1)的浓度范围内测定二嗪农。检测限和定量限分别为 1.1×10(-8)和 3.7×10(-8)mol L(-1)。该方法成功地应用于测定杀虫配方 Diazinon 10GR 和 Beaphar 275 中的有效成分。
