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This paper presents field and column experiments to determine the fate of radionuclides ( 238 U, 226 Ra and 210 Pb) and Mn, when applied in uranium mine waste water sprayed on to highly weathered soils near the Ranger uranium mine at Jabiru, Northern Territory, Australia. The radionuclides were retained in the surface few centimetres of soil. ...
The environmental impact of metal additions to a soil depends on the metal sorption ability of the soil. This study compared the Cd and Pb sorption abilities of some selected English and Indian soils. The results showed that the English soils generally sorbed Cd and Pb more strongly and in greater amounts compared to the Indian soils. Soil pH, CEC, contents of organic matter, clay and CaCO 3 ...
The impact of the surface properties of Fe oxides formed both in the absence and the presence of citric acid at the citrate concentration of 10 -5 M on their kinetics and mechanisms of Pb sorption was investigated by using pressure-jump relaxation spectrometry. The adsorption edge of Pb on these two Fe oxides can be described by the modified triple layer model (TLM) using the FITEQL program...
Remediation and revegetation of abandoned mined sites is often complicated by the lack of knowledge on factors leading to soil development on anthropogenic mine waste materials. Natural soil development has been examined on 35-year-old sulphide-rich waste deposits of a former gold mine. The muddy waste materials were discharged into a small settling basin (9850 m 2 ) by successive floods during...
The bioavailability and the potential toxicity of heavy metals in the environment depend on their speciation in the soil and the soil solution. The analytical task is rendered difficult because the individual chemical species are often present at nano- and picomolar concentration in natural systems.To determine the free metal ion (FMI) concentration, both analytical and computational approaches were...
Knowledge of the distribution of soil lead (Pb) is useful for making sound environmental decisions. The objective of this study was to determine soil Pb distribution in two Florida urban areas of similar size with different levels of industrial development and population: Gainesville and Miami. About 200 and 240 soil samples were collected within a depth of 0.2 and 0.1 m in Gainesville and Miami,...
The bioavailability and ultimate fate of heavy metals in the environment are controlled by chemical sorption. To assess competitive sorption of Pb and Cd, batch equilibrium experiments (generating sorption isotherms) and kinetics sorption studies were performed using single and binary metal solutions in surface samples of four soils from central Spain. For comparisons between soils, as well as, single...
The adsorption characteristics of lead on each genetic horizon of a natural brown forest soil profile were studied to recognize the possible immobilizing effect of a mineralogical diverse soil profile in the case of a possible lead contamination. Lead adsorption experiments were carried out on whole soil samples, soil clay fractions, as well as on their carbonate and organic matter free variant. TEM-EDS...
The impact of heavy metal pollution on growth and water quality has become a public concern. Fractionation of soil lead (Pb) is an important approach of chemical characterization and can provide useful information on its bioavailability. A greenhouse study was undertaken to estimate the availability of Pb fractions to rice in two paddy soils of Inceptisol (Fluventic Umbrepts) and Ultisol (Plinthudic...
Enhanced phytoextraction of heavy metals using chelating agents and agricultural crops is widely discussed as a remediation technique for agricultural soils contaminated with low mobile heavy metals. In this study, phytoextraction efficiency of Zea mays after single and split applications of EDTA was tested on the laboratory and the field scale. EDTA effectively increased the mobility of target heavy...
The spatial extent of metal contamination caused by small-scale ore veins is increased by periglacial solifluction. Our objectives were (1) to examine the spatial distribution of Pb in cover beds that migrated over Pb ore veins, (2) to calculate the transport distance of ore-derived Pb, and (3) to determine controls on the transport distance.We examined six transects (320–775 m long) in the Rhenish...
Reactions of heavy metals with soils are important in determining their availability and fate in the environment. Mono-metal sorption and lability of sorbed cadmium (Cd) and lead (Pb) in different representative soils from Egypt and Greece as influenced by their properties were investigated in this study. For this purpose eleven surface soil samples varying widely in their origin and properties were...
Soils play an important role in the control of metallic cations in the environment. Therefore, knowledge of the adsorption properties of soil is crucial in understanding and solving pollution problems. The aim of this paper is to study lead and zinc adsorption, onto an Algerian soil sample, as a function of the reaction time, pH, ionic strength and metal concentration. The adsorption of lead and zinc...
Exposure to toxic metals from fruits is an important pathway of human exposure to soil pollutants, but few researches on metals accumulation in the soil–fruit system were performed. In this study, we conducted a systemic survey of Cd and Pb accumulations in the soil–mango (Mangifera indica L.) system from an uncontaminated area, Hainan Island, China. Results indicated that concentrations of Cd and...
The Volturno River plain (Campania, Italy), is an extensive alluvial formation with large pedovariability, supporting valuable crop and livestock productions. The presence of illegal waste dumps with Potentially Toxic Elements (PTEs) could threaten both environmental safety and the agricultural activities. Research is currently underway aiming to evaluate the environmental conditions and present and...
Spatial distribution of soil lead (Pb) in cropland is an important reference for regional planning and eco-environmental protection, but related information was not available in an individual county with potential contamination in the high-speed developing Chengdu Plain. In this investigation, 623 topsoil samples, randomly taken from the Shuangliu county, Sichuan province, China, were analyzed for...
Preferential flow is the non-uniform movement of water and solutes through soils that bypasses a portion of the soil matrix. It limits the effective sorbing capacity of the soil and it has been related to a reduced solute residence time accounting for an increased risk of groundwater contamination. A dye tracer experiment and a subsequent soil sampling procedure in three adjacent soil profiles were...
Mixtures of organic and inorganic pollutants are frequently found in the environment. Because these pollutants can possess vastly different properties and compositions, their removal using conventional techniques is often difficult. In this work, electrokinetic remediation was studied to remediate clay soils and sandy soils that were contaminated with lead and phenanthrene. During electrokinetic remediation,...
Total concentrations and pools of Pb in the surface layers of mountain soils in the Karkonosze National Park are presented and discussed in relation to site altitudes and soil properties. Soil samples were collected from a forest floor and from the depths of 0–10cm and 10–20cm in 372 monitoring sites situated in a forested zone of the Park. Particularly high concentrations of Pb (24–200mg∙kg −1...
The lower sector of the Guadiana River Basin, located in southern Portugal and Spain, hosts soils and plants with elevated Pb, Cu and As near former and current mining sites. Two geogenic and two anthropogenic sources of Pb were identified where elevated concentrations are mostly related to the occurrence of sulphide-rich ore deposits, Volcanic Sedimentary formations and mining. These were generally...
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