Effect of hydrogen peroxide on the photodegradation of metamifop in the presence of zn(ii) ions.

The photodegradation of metamifop contained in Nominee-M herbicide and the effect of adding Hydrogen Peroxide and Zn(II) ions were studied. Worldwide, the persistence of herbicide and heavy metal contamination in the irrigation water have led to water pollution issues. Thus, the study focused on a photolytic system using UV light to enhance production of hydroxyl radicals (•OH) to degrade the targeted pollutant. The photodegradation process was conducted under UV lamp in the laminar flow chamber for 3 hours and magnetic plate with a magnetic stirrer was used to stir the sample. To monitor the degradation efficiency, the concentration of the organic compound and metal ions were characterized using High Performance Liquid Chromatography (HPLC) and UV-Visible spectrophotometer (UV-Vis). The highest degradation in UV/H2O2 was obtained at 97.3% on 5 ppm of metamifop in the presence of 10 ppm of Zn(II) ions and hydrogen peroxide. The result proved that less concentrated solutions of metamifop were easier to degrade and more concentrated solutions of Zn(II) ions and hydrogen peroxide in metamifop promoted the degradation by UV radiation. It was identified that when the concentration of metamifop, Zn(II) ions and hydrogen peroxide is increased, the degradation percentage decreased relatively. Hence, the findings demonstrated that the degradation percentage was conditional on the concentration of samples.