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Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite by Artur P. Deditius1,* and Martin Reich2,3 is a Earth and Planetary Sciences article available to read on EtoBox.

What is Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite about?

Arsenic-rich (arsenian) pyrite can contain up to tens of thousands of parts per million (ppm) of toxic heavy metals such as Hg, Tl, and Cd, although few data are available on their solid solubility behavior. When a compilation of Hg, Tl, and Cd analyses from different environments are plotted along with As in a M(Hg, Tl, and Cd)-As log-log space, the resulting wedge-shaped distribution of data points suggests that the solid solubility of the aforementioned metals is strongly dependent on the As concentration of pyrite. The solid solubility limits of Hg in arsenian pyrite-i.e., the upper limit of the wedge-shaped zone in compositional space-are similar to the one previously defined for Au by Reich et al. ( 2005) (C Hg,Au = 0.02C As + 4 × 10 -5 ), whereas the solubility limit of Tl in arsenian pyrite is approximated by a ratio of Tl/As = 1. In contrast, and despite a wedge-shaped distribution of Cd-As data points for pyrite in Cd-As log-log space, the majority of Cd analyses reflect the presence of mineral particles of Cd-rich sphalerite and/or CdS. Based on these data, we show that arsenian pyrite with M/As ratios above the solubility limit of Hg and Tl contain nanoparticles of HgS,

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Author

Artur P. Deditius1,* and Martin Reich2,3

Publisher

Mineralogical Society of America

Published

2016

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)