Heavy metal pollution has become a major concern in agriculture, with adverse effects on soil health an‎d food safety. Chromium an‎d manganese are elements found in soil that can leach into water an‎d agricultural products through groundwater. Cr6+ an‎d Mn7+ ions are toxic species that cause a variety of diseases. Therefore, it is important to eliminate the toxicity of these dangerous ions from various sources of water, soil, an‎d food. Therefore, the use of natural compounds of plant origin to reduce the risks of toxic species has received much attention in recent years. In the meantime, plant extracts, due to their various compounds such as polyphenols an‎d anthocyanins, can reduce toxic ions an‎d be effective in eliminating their toxicity. The Persian pomegranate plant, with the scientific name Pleniflora Punica var granatum, is from the Puniaceae family. Infertile pomegranate flowers are known as an important medicinal plant in traditional medicine. This plant is widely used due to its various compounds including polyphenols, flavonoids an‎d anthocyanins. In this study, anthocyanins in Persian pomegranate flowers were extracted using three methods: leaching with solvent, microwaves an‎d ultrasound bath. Then, column chromatography containg silicagel was used to purify an‎d separate the anthocyanins in Persian pomegranate flowers. Using this method, four phases were separated. Subsequently, the separated phases were fully characterized using UV-Vis, FT-IR, LC/MSMS, 1H-NMR an‎d fluorescence spectroscopy. The reduction of the toxicity of potassium permanganate (Mn7+) an‎d sodium dichromate (Cr6+) using Persian pomegranate flower extract as a natural reducing agent was investigated using two methods: spectroscopy an‎d titration. UV-Vis absorption spectra were used to analyze the toxicity reduction in detail. In general, the results showed that Persian pomegranate flower extract could be a suitable option for reducing the toxicity of chromium (VI) an‎d manganese (VII) metal ions due to its polyphenolic compounds an‎d various anthocyanins. In addition, the complexes were synthesized under reflux conditions using Persian pomegranate flower extract an‎d metal ions including copper (II), nickel (II), chromium (III), zinc (II), iron (III), cobalt (II) an‎d manganese (II). Then, the obtained complexes were characterized using FT-IR, UV-Vis, XRD, FE-SEM an‎d UV-Vis DRS methods, which indicated the successful synthesis of the complexes.

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محمد ديناري , كاظم كرمي