Plants require nutrients from the soil solution for their growth. However,potentially toxic elements (PTEs) can be absorbed and accumulated in plant organs andtissues, and this is an important channel through which PTEs can enter into the foodchain. The study of the dynamics of these elements in the soil is fundamental for abetter understanding of the factors that influence soil-plant transfer. Kinetic studies canhelp to elucidate factors related to PTEs desorption, that is a key phenomenon affectingPTE bioavailability. Furthermore, reaction time, contact time and the content of soilorganic matter- OM (and its multiple interactions with the soil mineral fraction) areclosely related to the processes of sorption and solubilization of PTEs in the soil. Ouraim is to assess the effect of OM on PTE desorption in garden soils. Kineticexperiments will be carried out using rates of organic composts added to PTE-spikedsoils. A stirred-flow chamber system will be used, and the extracts will be collected atfixed intervals. PTE desorption against time, and the static method, Profile Analysis,will allow the evaluation of the effect of the OM and time on PTE desorption.
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