Speciation of neptunium during sorption and diffusion in natural clay

Speciation of neptunium during sorption and diffusion in natural clay

In argillaceous rocks, which are considered as a potential host rock for nuclear waste repositories, sorption and diffusion processes govern the migration behaviour of actinides like neptunium. For the safety analysis of such a repository, a molecular-level understanding of the transport and retardation phenomena of radioactive contaminants in the host rock is mandatory. The speciation of Np du...

Pesticide sorption and diffusion in natural clay loam aggregates.

Pesticide sorption in soils is controlled by time-dependent processes such as diffusion into soil aggregates and microscopic sorbent particles. This study examines the rate-controlling step for time-dependent sorption in clay loam aggregates. Aggregates (5 mm) were stabilized with alginate, and adsorption of azoxystrobin, chlorotoluron, and cyanazine was measured in batch systems equilibrated f...

Methylarsenic Sorption and Speciation Mechanisms in Natural Systems

Arsenic (As) originates in many rocks and minerals throughout the world. Natural phenomena, such as weathering and biological activities, along with industrial activities and agricultural activities are responsible for As introduction to the environment. The most predominate oxidation states for inorganic As species are arsenate As (H3AsO4) and arsenite As (H3AsO3). In addition to inorganic for...

Sorption of trivalent actinides on smectite rich natural clay

effectiveness of hedstroum files and rotary k3 instruments in removal of obturation materials during retreatment in curved canals

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