Physical and chemical characterization of actinides in soil from Johnston Atoll

Article Abstract:

A study aimed at determining the effect of prolonged environmental exposure to the quality of actinides present in Johnston Atoll is presented. A sample of the contaminated coral soil from the atoll was taken to analyze the characterization of its actinide content. Results of the experiments indicate that the sample showed no definite actinide phase in the soil particles, despite the large actinide content. It is further noted that the relatively insoluble actinide oxides turned to the more soluble actinyl oxides and actinyl carbonate coordinated complexes following their prolonged environmental exposure.

Actinium, Oceania, Actinide elements, Nuclear reactions, Johnston Atoll

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Using cadmium-113 NMR spectroscopy to study metal complexation by natural organic matter

Article Abstract:

A study of pH effects on metal complexation in natural organic matter (NOR) using cadmium (Cd) nuclear magnetic resonance spectrometry reveals that acidic solutions obtain a single prominent peak while an alkalinic pH produces a more complex spectra. The study reveals that NOR-Cd exchange rates are faster at acidic levels with positive Cd atoms coordinated with O donor atoms at almost all pH levels. At higher pH levels, positive Cd atom-N donor atom coordination is observed.

Research and Development in the Physical, Engineering, and Life Sciences, Cadmium, Pollution Control R&D, Nuclear magnetic resonance spectroscopy, Pollution control research, Coordination compounds

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Dissolution of iron oxides by phagotrophic protists: using a novel method to quantify reaction rates

Article Abstract:

A novel inert tracer method based on the synthesis of ferrihydrite saturated with Ba was used to estimate the reaction of iron oxides with protozoan grazers. The new technique estimates the collection of tracer in the dissolved phase and measures the degree of iron oxide reaction. The inert tracer method is an improvement over existing methods in its ability to better estimate the degree of dissolution of protozoan-mediatted iron oxides.

Primary metal products, not elsewhere classified, Electrometallurgical Ferroalloy Product Manufacturing, Barium, Magnetic Iron Oxide, Composition, Iron oxides, Sea-water, Seawater, Magnetic materials, Tracers (Chemistry)

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