Timothy Pasakarnis

TL;DR: A mass balance model is derived to quantify the extent of Fe atom exchange between goethite and aqueous Fe(II) that accounts for different Fe pool sizes and results from sequential chemical extractions indicate that (57)Fe accumulates in extracted Fe(III)Goethite components.

TL;DR: The extent of Fe atom exchange between magnetite and aqueous Fe(2+) was significant, and went well beyond the amount of Fe atoms found at the near surface, suggesting that for magnetite, unlike goethite, Fe atom diffusion is a plausible mechanism to explain the rapid rates ofFe atom exchange in magnetite.

TL;DR: In this paper, a 28-day sterile experiment was conducted in a tropical soil, where 57Fe-enriched Fe2+(aq) (57/54Fe = 5.884 ± 0.003) was reactivated in anoxic conditions and the aqueous and bulk pools both moved ∼7% toward the isotopic equilibrium.

TL;DR: In this paper, the authors evaluated the reduction of Hg(II) by magnetites with varying Fe (II) content in both the absence and presence of chloride, and found that magnetite stoichiometry (x = Fe(II)/Fe(III) influences the rate of inorganic mercury reduction and formation of products.

TL;DR: In this article, an environmental history of a river-estuary complex in mid-coast Maine to examine ecosystem degradation and collapse during three centuries of intensified human disturbance followed by ecosystem recovery over the three decades since the Clean Water Act and the ban on the general use of DDT pesticide in 1972.