1,720,996 research outputs found
Evaluation of Pb and Ni Mobility to Groundwater in Calcareous Urban Soils of Ancona, Italy
No full textThis study was performed on 21 soils with the aim of establishing whether Pb and Ni adsorption/desorption parameters could be considered as good indicators of the risk of groundwater pollution. Results showed that high pH values in soil caused a totally irreversible Pb adsorption, thus excluding any risk of Pb groundwater pollution. Sorption/desorption studies, quantified by the desorption index (DI), showed that Ni retention was only partly affected by the basic pH values but it was also due to the electrostatic attraction processes occurring on soil surfaces, as demonstrated by the partial reversibility of the Ni sorbed. This justifies possible risks of Ni groundwater pollution. The results of a monitoring research confirmed these findings. Results suggested that the adsorption/desorption parameters, namely DI, are promising indicators to predict the risk of groundwater pollution from metals in calcareous soils
Adsorbimento e desorbimento di Ni e Pb nei suoli urbani della città di Ancona-XXV Convegno Nazionale SICA
No full textDistribuzione e valutazione del potere inquinante per le falde dei metalli pesanti presenti nei suoli urbani della città di Ancona
No full textNitrogen dynamics in two soils with different texture treated with livestock –derived organic materials.
No full textAggregation and nitrogen mineralisation in two soils with different texture treated with live-stock derived organic materials
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Adaptive Strategy of Three Typical Plant Species Over Majella Massif (central Italy): Differences in Microbial Community and Nutrient Uptake
No full textThe rhizosphere represents a highly dynamic and complex interface for chemical, physical and biological interactions between plant and soil (Berg and Smalla, 2008). We report the adaptive strategy induced by the rhizosphere of three plants colonizing the high-elevated base-rich soils of Majella Massif (central Italy): Silene acaulis (L.), Dryas octopetala (L.), Helianthemum nummularium (L.) Mill. subsp. grandiflorum (Scop.). The aims of the research were to investigate the effects of these species, distinguishing between rhizospheric and bulk soil, on: (i) the main chemical characteristics (ii) the microbial community structure, abundance and activity, and (iii) the nutrient absorption strategy
Factors Involved in Uptake of Lead by Some Edible Crops Grown in Agricultural Soils of Central Italy
No full textThis study was organized to investigate the bioavailability of Pb in soil, as affected by soil type and crop species. The four most representative forms of Pb in soil (exchangeable, bound to carbonates, bound to the Fe-Mn oxides, and bound to organic matter) were considered, and their respective contribution to the uptake of this metal was determined. Four edible crops (lettuce, radish, tomato, and Italian ryegrass) were grown in four soil types, both nonspiked and spiked with 200 mg Pb kg-1. Chemical analyses were carried out to determine the amount of Pb sorbed from the soil and stored in the different plant organs. The bioaccumulation factor (BAF) and the translocation factor were derived and used to compare plant species. Results showed that all the test plants sorbed 10 to 30 times more Pb from spiked soils, as compared with nonspiked soils. The BAF and translocation factor showed that, excluding Italian ryegrass, all the crops sorbed less Pb from the soils containing Ca carbonate. On the basis of BAF, lettuce, tomato, and Italian ryegrass could be classified as crops with high Pb uptake ability in all soils. Concerning the distribution of Pb within the plant, all species showed the tendency to store this metal mainly in roots. The translocation to above-ground organs was the highest with lettuce, tomato (with reference to non edible above-ground organs) and Italian ryegrass, whereas radish showed the lowest translocation ability, together with the lowest uptake ability
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