The influence of direct current electric fields on the possible electrokinetic delivery of nano-iron slurry in clay for the purpose of fast and effective remediation of soil contaminants has been tested. Nano-iron can be introduced to soil hydraulically in slurry form, but in tight clay soil, delivery of a uniform distribution of the slurry may be difficult to achieve for effective remediation....

Role of Soil Plasticity in Evaluating Clay Conditioning for EPB Tunnelling Soil clogging occurred at the early construction stage of Nanchang Metro Line 1, China, when an earth balance pressure (EPB) shield passed through the argillaceous siltstone with a total content of clay minerals of 40.5%. To avoid the reappearance of soil clogging at the later stage, a new scheme was proposed to determin...

introduction: iron is found in different forms in the soil. in the primary minerals, iron is found as fe3+ or fe2+ which converted to fe2+ and released in unsuitable reduction conditions. minerals such as sulfide or chlorine and bicarbonate can affect and change the different forms soil fe. feas these elements are abundance in groundwater or soil, they are capable to react chemically with fe an...

the purpose of the present research was to study the properties of natural habitats and growth status of the genus tamarix in miankangi, sistan province, south-eastern iran. selective sampling was used to examine the natural stands structure. then, the one ha-rectangular sample plots were stablished in the stands and surrounding bare lands as control plots. quantitative variables of stands viz....

Regolith characterization in its entirety is particularly difficult gneissic regoliths due to the heterogeneity of their rock structure. Rare earth elements (REE) are a useful tool helping understand evolution regoliths. This study relates mineralogy and weathering indexes three gneisses (P1-leucocratic, P2-mesocratic P3-melanocratic gneisses) distribution REE at depth. In soil, clay activity, ...

SOIL pore space and its intrinsic characteristics such as surface area, roughness, tortuosity, and connectivity are probably the most important factors controlling water and solute movement in soils. Interaggregate porosity is the result of the arrangement of the soil aggregates. These aggregates are composed of subunits, of which clay minerals and other colloids are the main components. The wa...

Rheological characteristics of soils, including their deformation and flow behaviors when subjected to external stress, can provide important information on microstructural stability. In this study we used rheological measurements examine the soil aggregate microstructure stability four different orders – Alfisol, Mollisol, Inceptisol, Entisol along a forested catena in Mazandaran Province, nor...

Several studies have shown that soil microorganisms play a key role in the success of plant invasion. Thus, ecologists have become increasingly interested in understanding the ecological effects of biological invasion on soil microbial communities given continuing increase in the effects of invasive plants on native ecosystems. This paper aims to provide a relatively complete depiction of the c...

An enigmatic stepwise increase in oxygen in the late Precambrian is widely considered a prerequisite for the expansion of animal life. Accumulation of oxygen requires organic matter burial in sediments, which is largely controlled by the sheltering or preservational effects of detrital clay minerals in modern marine continental margin depocenters. Here, we show mineralogical and geochemical evi...

dynamically stable redox state under oxidizing conditions in soils. The constant capacitance model, a chemical surface complexation Arsenate adsorption on soils and soil minerals has model, was applied to arsenate, As(V), adsorption on 49 soils selected been described using various modeling approaches. Such for variation in soil properties. The constant capacitance model was able to fit arsenat...