Coal, containing all the elements that are present in nature and more than 200 minerals, has
a complex chemical structure, making it one of the most complex geological materials …

Coal, one of the most complex geological materials, consists of organic and mineral matter,
the latter including crystalline minerals, non-crystalline mineraloids, and elements with non …

A series of 20 coal samples were subjected to sequential leaching with ammonium acetate,
hydrochloric acid, hydrofluoric acid, and nitric acid to quantify the modes of occurrence of …

Redox-sensitive transition group elements are involved in almost all fundamental
geochemical processes. Of these elements, vanadium (V) contributes a particularly powerful …

This research focused on the distribution and chemical speciation of Cr, Pb, Cd, Cu, Zn, and
As in fly ash and flue gas desulfurization gypsum (FGD gypsum) from a large-scale …

The growing demand for rare earth elements (REEs), which play vital roles in the production
of technologically advanced products, has stimulated the development of original processes …

Koocanusa Reservoir (KOC) is a waterbody that spans the United States (US) and
Canadian border. Increasing concentrations of total selenium (Se), nitrate+ nitrite (NO3 …

Two new approaches to quantify sulfur functionalities in natural organic matter from S K-
edge XANES spectroscopy are presented. In the first, the K-edge spectrum is decomposed …

The labyrinthine world of arsenic minerals has piqued the curiosity of many researchers in
mineralogy, geochemistry, chemistry, and environmental sciences. Arsenic was known to …

Electron beam microanalysis of coal samples in US Geological Survey (USGS) labs
confirms that As is the most abundant minor constituent in Fe disulfides in coal and that Se …