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Six kinds of amendments were added to contaminated soil with the goal to alter the mobility of heavy metals and to modify potential environmental impacts. The following amendments were used at doses ranging from 1 to 5%: two kinds of young brown coals (lignite, oxihumolite) with a high content of humic acids, two commercially available derivatives of humic acids (potassium humate and iron humate),...
Mangroves of New Caledonia act as a buffer between a lagoon of more than 20,000km 2 and the Island, which suffers intense processes of erosion resulting from urbanization and natural resources exploitation. This preliminary study aims at determining how heavy metals are distributed in mangrove sediments and pore-waters in relationship with their organic content. To reach our goal, a series...
In the framework of a project aiming to phytoremediate heavy metal contaminated soils in the Apulia region, Southern Italy, a series of greenhouse experiments followed by field trials were performed in order to optimize heavy metal phytoextraction by Brassica napus. The effects of root colonization by Bacillus licheniformis BLMB1 and of addition of municipal solid waste (MSW) composts on the capacity...
The usefulness of limestone, red mud, and furnace slag on the in situ stabilization of arsenic (As) and heavy metals was evaluated relative to different endpoints (microorganisms, plants, and humans). Individually or combined treatment of iron-rich amendments were effectively lowered the availability of trace elements. Compared to control soil, Ca(NO 3 ) 2 -eatractable As, Cd, Pb,...
The sorption and retention of mixtures of heavy metals by soil are complex processes that depend on both soil properties and competition between metals for sorption sites. Cu 2+ and Cd 2+ are among the most potentially toxic heavy metals, they are present –often together – in numerous polluting spills and in agrochemicals. The objective was to evaluate and compare the competitive and...
Interest in soil contamination has been growing in recent years due to the ongoing degradation of soil environments. Therefore, the development of remediation techniques and the study of contaminant sorption and migration are areas of intense research.In this study, the authors sought to evaluate the scenario of co-contamination of a loamy sand soil by multiple heavy metals. To that end, the sorption...
The selection of appropriate plant species is critical in the successful application of phytoremediation techniques. The present study is an attempt to assess the capability of three brassicaceae, Brassica alba (L.) Rabenh, Brassica carinata A. Braun and Brassica nigra (L.) Koch, for the phytoextraction of Cr, Cu, Pb and Zn from an unpolluted and polluted silty loamy soil added with either Bacillus...
Transport of heavy metals from acid mine drainage through soils can impact valuable water resources and have a deleterious effect on their associated ecosystems. The movement of single, binary and multi-metal systems through lateritic soil columns were experimentally determined and then modeled with the HYDRUS-1D using a local equilibrium convection–dispersion (CD eq ) model, or chemical nonequilibrium...
Elemental composition of various fresh parent rocks has received little attention in relation to cation imbalance and potential for high concentrations of heavy metals in soils. The objective of the study was to assess elemental composition of fresh parent rocks and its effect on cation imbalance and natural heavy metal occurrence in soils. Seven fresh rocks consisting of basalt, gabbro, basaltic...
Carbonate-rich mine tailings are exposed to severe erosion and dispersion in Mediterranean climates. In Jalta mining area, the dispersion of particles that contain (Pb, Zn and Cd) results in the contamination of the surrounding agricultural soils. These soils have high concentrations of Pb (17,229mg/kg), Zn (4813mg/kg) and Cd (42mg/kg). Mobilization of heavy metal rich particles from mining waste...
The fate of heavy metals in the environment is largely controlled by sorption reactions. In the current study, sorption of Ni, Cd, Zn and Cu to distinctive silicate clay minerals that occur primarily in arid and semiarid regions, namely palygorskite and sepiolite, was assessed in multi-metal batch experiments. The results confirmed that competitive sorption pattern of Ni, Cd, Zn and Cu on the minerals...
Magnetic and geochemical analyses on a collection of 84 soil samples from the alluvial plain of Ogosta river and its tributaries (NW Bulgaria) have been carried out for revealing the pollution pathways and the role of iron oxides in mobilization, vertical re-distribution and occurrence of different heavy metals in Fluvisols. Three depth soil profiles, representing non-contaminated background site;...
Soil contamination by heavy metals is an important problem in many countries. As a first step in mitigating the related health risks, one has to delineate zones where metal concentrations exceed tolerable levels. Predictions of metal concentrations are usually required for blocks because remediation or regulatory decisions are imposed for entire parcels. Parcel areas typically exceed the observation...
This study presents an application of environmental magnetism techniques for the characterisation of the soils near Coimbra (central Portugal). Magnetic measurements, scanning electron microscopy and geochemical studies were carried out on samples collected in 6 soil profiles in order to find possible relationships and to interpret environmental implications. Magnetic susceptibility, saturation isothermal...
A set of periurban calcareous agricultural Mediterranean soils, with a natural gradient in the content and composition of organic matter (OM), was spiked with a mixture of Cd, Cu, Pb and Zn at two levels – designated Tt1 and Tt2 – within the limit values proposed by the current European legislation and incubated for ≤12months. We conducted bioassay experiments with romaine and iceberg varieties of...
Excessive application of chemical products for promoting crop growth is a significant contributor for elevated concentrations of heavy metals in agricultural soils potentially threatening human health through the food chain. In this study, a series of heavy metals were quantified in 132 agricultural soils of Argolida basin, Peloponnese, Greece, with the aim to characterize their accumulation patterns...
This study discovers and surveys sites left by former Zn–Pb mining in western Małopolska (S Poland), focusing on old heaps of mining waste rock located in agricultural land and suburban wasteland. Topsoil samples were taken from 73 heaps and described using many parameters, including heavy metal contamination (the content of total, EDTA-extractable, BaCl 2 -extractable and water-extractable...
The chemical composition of peat cores sampled from nine drained peatland catchments overlying either black schist or felsic bedrock was studied in Finland. Black schist is enriched in heavy metals, sulphur and graphitic carbon, and therefore it is susceptible to weathering whereas felsic rock types in the study region are more resistant and contain only negligible amounts of heavy metals, sulphur...
The sequential extraction procedure (SEP) is often applied to soils for identification of binding phases but rarely is it used to monitor binding dynamics temporally. In this study, contaminated soils were subjected to two different leaching scenarios, one analogous to a hydrostatic or stagnant water exposure, and one that represents a hydrodynamic event such as heavy precipitation. A four step SEP...
The environmental mobility and bioavailability of heavy metals in soil are greatly influenced by sorption reactions on soil minerals, which are, in turn, controlled by the presence of various organic ligands, such as amino acids, in soil solution. In this study, the effects of l-cysteine (Cys) and l-histidine (His) amino acids on lead (Pb) sorption by palygorskite and sepiolite, as the specific silicate...
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