The concentration of toxic metals and polycyclic aromatic hydrocarbons (PAHs) in soil, their bioaccumulation Lumbricus terrestris areas around Kolo Creek, Niger Delta, Nigeria were evaluated this study. 12 soil samples collected from 4 sites, while also where obtained. Toxic extracted using aqua regia quantified with a flame atomic absorption spectrophotometer. Extraction PAHs was achieved by l...

platinum extraction from different secondary sources has been experimentally tested by many researchers. in this article, dissolution of platinum in aqua-regia solution from two types of spent catalysts (reforming and nitric acid production) was kinetically studied. a variety of kinetic models for heterogeneous solid-liquid reactions, including homogeneous diffusion model, shrinking core model,...

soil washing by mobilizing is one of in-situ techniques for soil decontamination. applying this technique to the contaminated soils could be followed by many environmental problems. therefore, it is important to study the effective factors on removal of heavy metals from different forms. in the present research, the forms of zn, pb, and cd in three contaminated soils from the zinc-lead smelting...

In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), lead (Pb) contamination in sediment samples were investigated using aqua regia extraction Tessier’s five-step sequential extraction. Based on concentration metals, influence Hapcheon-Changnyeong weir sediments Nakdong River was assessed. The origins contaminants, their bioavailability, mobility determined Greater h...

Rice husk is widely recognized as significant biomass containing cellulose, lignin and silica. Usually, rice combusted for energy purposes but it contributes to severe environmental pollution. Therefore, the integrated components of (i.e. silica) can be extracted converted into value-added products. However, metallic impurities must removed before further extraction. Generally, leached with con...

Sequential extraction procedures (SEPs) are commonly used to determine speciation of trace metals in soils and sediments. However, the non-selectivity of reagents for targeted phases has remained a lingering concern. Furthermore, potentially reactive phases such as phyllosilicate clay minerals often contain trace metals in structural sites, and their reactivity has not been quantified. Accordin...

Abstract The immobilization effect of soil amendments on leaching and bioavailability Pb, Zn Cd in highly contaminated soils under industrial impact was studied by collecting the surroundings Zn-Pb Smelter “Miasteczko Śląskie” southern Poland as an example. Various amounts four additives (phosphate fertilizer, limestone powder, bentonite rock bog iron ore) were tested laboratory experiments to ...

We modified the robust analysis of variance (RANOVA) method to calculate sampling uncertainty of selected trace elements determined in soil samples from two heterogeneous remote historic metal ore mining areas. Classical RANOVA is down-weighting the outlying values by replacing them during the calculation process with mean ± c·σ r . Because the arithmetic mean is greatly influenced by outliers,...

The recycling of precious metals, for example, platinum, is an essential aspect of sustainability for the modern industry and energy sectors. However, due to its resistance to corrosion, platinum-leaching techniques rely on high reagent consumption and hazardous processes, for example, boiling aqua regia; a mixture of concentrated nitric and hydrochloric acid. Here we demonstrate that complete ...