Dipartimento di Valorizzazione e Protezione delle RIsorse Agroforestali - DIpartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, 1993
I fattori legati alla mobilità del cesio nei suoli e nei sedimenti sono discussi in letteratura, ... more I fattori legati alla mobilità del cesio nei suoli e nei sedimenti sono discussi in letteratura, in particolare sono analizzati il ruolo della sostanza organica e della composizione mineralogica dell'argilla del suolo,. Sostanza orgnica e minerali argillosi possono avere un ruolo antagonista nella ritenzione del radiocesio e degli altri radionuclidi. Nella presente tesi di laurea, sono discussi i modelli di assorbimento del radiocesio sulla sostanza organica e le argille. I dati sperimentali, indicano come la composizione mineralogica delle argille possa avere un ruolo importante nel controllare la velocità di lisciviazione del radiocesio nel suolo, e la sua biodisponibilità. Particolarmente rilevante nel diminuire la mobilità del radiocesio presente nei suoli, è la componente bentonitica dei cristali argillosi del suolo.
The box and flux model is a mathematical tool used to describe and forecast the major and trace e... more The box and flux model is a mathematical tool used to describe and forecast the major and trace elements perturbations of the Earth biogeochemical cycles. This mathematical tool describes the biogeochemical cycles, using kinetics of first, second and even third order. The theory and history of the box and flux modeling are shortly revised and discussed within the framework of Jim Lovelok's Gaia theory. The objectives of the investigation were to evaluate the natural versus anthropic load of Potentially Toxic Elements (PTEs) of the Scottish soils, investigate the soil components adsorbing and retaining the PTEs in non-mobile species, evaluate the aging factor of the anthropic PTEs and develop a model which describes the leaching of PTEs in layered soils. In the Scottish land, the soil-to-rock enrichment factorinversely correlates with the boiling point of the PTEs. The same is observed in NW Italy and USA soils, suggesting the common source of the PTEs. The residence time in soil...
The box and flux model is a mathematical tool used to describe and forecast the major and trace e... more The box and flux model is a mathematical tool used to describe and forecast the major and trace elements perturbations of the Earth biogeochemical cycles. This mathematical tool describes the biogeochemical cycles, using kinetics of first, second and even third order. The theory and history of the box and flux modeling are shortly revised and discussed within the framework of Jim Lovelok's Gaia theory. The objectives of the investigation were to evaluate the natural versus anthropic load of Potentially Toxic Elements (PTEs) of the Scottish soils, investigate the soil components adsorbing and retaining the PTEs in non-mobile species, evaluate the aging factor of the anthropic PTEs and develop a model which describes the leaching of PTEs in layered soils. In the Scottish land, the soil-to-rock enrichment factorinversely correlates with the boiling point of the PTEs. The same is observed in NW Italy and USA soils, suggesting the common source of the PTEs. The residence time in soils of the measured PTEs linearly correlates with the Soil Organic Matter (SOM). The element property which mostly explains the adsorption capacity for PTEs' is the ionic potential (IP). The downward migration rates of the PTEs inversely correlate with SOM, and in Scottish soil, they range from 0.5 to 2.0 cm•year −1. Organic Bentoniteis the most important soil phase adsorbing cation bivalent PTEs. The self-remediation time of the polluted soil examined ranged from 50 to 100 years. The aging factor, the adsorption of PTEs' into non-mobile species, and occlusion into the soil mineral lattice was not effective. The box and flux model developed, tested and validatedhere does not describe the leaching of PTEs following the typical Gaussian shape distribution of the physical diffusion models. Indeed, the mathematical model proposed is sensitive to the inhomogeneity of the layered soils.
Dipartimento di Valorizzazione e Protezione delle RIsorse Agroforestali - DIpartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, 1993
I fattori legati alla mobilità del cesio nei suoli e nei sedimenti sono discussi in letteratura, ... more I fattori legati alla mobilità del cesio nei suoli e nei sedimenti sono discussi in letteratura, in particolare sono analizzati il ruolo della sostanza organica e della composizione mineralogica dell'argilla del suolo,. Sostanza orgnica e minerali argillosi possono avere un ruolo antagonista nella ritenzione del radiocesio e degli altri radionuclidi. Nella presente tesi di laurea, sono discussi i modelli di assorbimento del radiocesio sulla sostanza organica e le argille. I dati sperimentali, indicano come la composizione mineralogica delle argille possa avere un ruolo importante nel controllare la velocità di lisciviazione del radiocesio nel suolo, e la sua biodisponibilità. Particolarmente rilevante nel diminuire la mobilità del radiocesio presente nei suoli, è la componente bentonitica dei cristali argillosi del suolo.
The box and flux model is a mathematical tool used to describe and forecast the major and trace e... more The box and flux model is a mathematical tool used to describe and forecast the major and trace elements perturbations of the Earth biogeochemical cycles. This mathematical tool describes the biogeochemical cycles, using kinetics of first, second and even third order. The theory and history of the box and flux modeling are shortly revised and discussed within the framework of Jim Lovelok's Gaia theory. The objectives of the investigation were to evaluate the natural versus anthropic load of Potentially Toxic Elements (PTEs) of the Scottish soils, investigate the soil components adsorbing and retaining the PTEs in non-mobile species, evaluate the aging factor of the anthropic PTEs and develop a model which describes the leaching of PTEs in layered soils. In the Scottish land, the soil-to-rock enrichment factorinversely correlates with the boiling point of the PTEs. The same is observed in NW Italy and USA soils, suggesting the common source of the PTEs. The residence time in soil...
The box and flux model is a mathematical tool used to describe and forecast the major and trace e... more The box and flux model is a mathematical tool used to describe and forecast the major and trace elements perturbations of the Earth biogeochemical cycles. This mathematical tool describes the biogeochemical cycles, using kinetics of first, second and even third order. The theory and history of the box and flux modeling are shortly revised and discussed within the framework of Jim Lovelok's Gaia theory. The objectives of the investigation were to evaluate the natural versus anthropic load of Potentially Toxic Elements (PTEs) of the Scottish soils, investigate the soil components adsorbing and retaining the PTEs in non-mobile species, evaluate the aging factor of the anthropic PTEs and develop a model which describes the leaching of PTEs in layered soils. In the Scottish land, the soil-to-rock enrichment factorinversely correlates with the boiling point of the PTEs. The same is observed in NW Italy and USA soils, suggesting the common source of the PTEs. The residence time in soils of the measured PTEs linearly correlates with the Soil Organic Matter (SOM). The element property which mostly explains the adsorption capacity for PTEs' is the ionic potential (IP). The downward migration rates of the PTEs inversely correlate with SOM, and in Scottish soil, they range from 0.5 to 2.0 cm•year −1. Organic Bentoniteis the most important soil phase adsorbing cation bivalent PTEs. The self-remediation time of the polluted soil examined ranged from 50 to 100 years. The aging factor, the adsorption of PTEs' into non-mobile species, and occlusion into the soil mineral lattice was not effective. The box and flux model developed, tested and validatedhere does not describe the leaching of PTEs following the typical Gaussian shape distribution of the physical diffusion models. Indeed, the mathematical model proposed is sensitive to the inhomogeneity of the layered soils.
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