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The determination of geochemical fractions of heavy metals (HM) in soils is a key issue when studying their mobility. Therefore, we have determined the geochemical fractions and the vertical distribution of chromium (Cr), copper (Cu), and zinc (Zn) in seven floodplain soil profiles in relation to flooding conditions and relevant soil properties. These soil profiles represent two different soil groups...
We aimed to determine the concentrations and geochemical fractions of rare earth elements (REEs) according to the genetic soil horizons of two soil profiles (Eutric Fluvisols) at the Wupper River, Germany. The concentrations were determined using aqua regia extraction and the geochemical fractions were assessed using a sequential extraction procedure developed by the Commission of the European Communities...
Few studies have been conducted to understand phosphorus (P) dynamics in serpentinitic landscapes where soil P availability is often limited due to immobilization by abundant Fe minerals. The objective of this study was to determine soil-solid P speciation and hosting phases in the soil formed on serpentinitic landscapes using P K-edge X-ray absorption near-edge structure (XANES) spectroscopy and...
Hydrophobic organic compounds in soils, mainly derived from plants, cause soil water repellency (SWR). The relation between such hydrophobic compounds, which we call SWR-markers, and SWR has been rarely known. We aim to understand these relations and trace the possible origin of SWR-markers. Sandy soils were collected from the field under various vegetation at different depths. Of the bulk soil characteristics,...
90Sr is a long-lived radionuclide, which enters the environment by accidental release of liquid radioactive waste. In this study, Sr2+ sorption was investigated using eight different soil types. Experiments were conducted by varying different parameters such as: contact time, solution pH and initial Sr2+ concentration, while distribution of Sr2+ in various soil fractions was studied using modified...
Many floodplains worldwide are contaminated with a variety of potentially toxic trace metals. The flooding of such plains causes decreases of the soil redox potential and strongly affects the mobility of stored metals. We conducted a 40-day incubation experiment by flooding a carbonatic soil in a microcosm and determining Eh, pH, H2S, organic and inorganic C, ion composition, and metal concentrations...
The effect of wetland plants on metal status in the rhizosphere is species specific. The present study aimed to address the effects of different chemical speciations on metal redistribution and verify changes in metal speciation in the rhizosphere caused by wetland plants based on different radial oxygen losses. The presence of wetland plants increased the redox potential and led to the redistribution...
In this study, oxalate-based washing process was designed to remediate the arsenic (As)-contaminated soil, where As was mainly associated with amorphous iron–aluminum (Fe/Al) hydrous oxides. Oxalate is a naturally present organic acid and has been commonly used to extract Fe from amorphous oxides due to its reducing and chelating capacities. In the oxalate-based washing process, reductive and ligand-promoted...
Two different amendments, an iron-rich water treatment residue (Fe-WTR), a municipal solid waste compost (MSW-C) and their combination (Fe-WTR+MSW-C) were added at different rates (from 2 to 4% w/w) to three mining soils (S1, S2, S3) mainly polluted with As (from 371 to 22,661mg·kg−1d.w.) and different co-occurring trace metals (i.e. Pb, Zn and Cu) to evaluate their effectiveness as metal(loid)s-immobilizing...
Zinc (Zn) biofortification in rice improves human nutrition and contributes considerably to rice growth. However, available information on Zn extractability and quantitative knowledge of how Zn is bound in paddy soils from Southeast Asia, which is of immense importance for Zn nutrition in rice, is rather limited. Here, we identified and quantified Zn pools with different solubility in 150 paddy soil...
With the ever-increasing demand for coal, the drawbacks associated with it also increase. Accelerating accumulation of fly ash, a byproduct in coal combustion processes, is of major environmental concern at present. Fly ash finds its maximum utilization in concrete and cement factory due to its pozzolanic property. However, fly ash is also used in the agricultural division as a “fertilizer” especially...
The geochemical fractionation and potential mobilization of Co, Cu, Ni, and Zn were studied in thirteen soil profiles originating from Germany and Egypt to assess the potential mobilization of these potentially toxic metals. The German soils were classified as Eutric Fluvisols, Tidalic Fluvisols, Haplic Gleysols, and Calcic Luvisols, and the Egyptian soils as Eutric Fluvisols, Sodic Fluvisols, and...
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