Darryl A Hoppe

Air-free pH and specific conductance measurements for effluent generated during phosphate removal column experiment

These data represent the air-free pH and specific conductance per pore volume of effluent generated by the phosphate removal column experiment. Solid samples used for the columns are of modern and legacy iron and steel slag from the Chicago-Gary area of Illinois and Indiana, USA.

Categories: Data; Tags: Chicago, Cook County, Gary, Illinois, Indiana, All tags... Indiana Harbor, Lake County, Water pH, geochemistry, water temperature, Fewer tags

Germanium (Ge) is an increasingly important element used in critical technologies for communication, defense, and computing. However, Ge is scarce, and there is no United States (U.S.) primary production. Additionally, the environmental behavior of Ge is poorly understood. Germanium does not generally form its own minerals, but is instead recovered as a byproduct of zinc mining or of coal fly ash. It has been deemed critical by the U.S. and globally, and investigations of its geologic concentration, environmental fate and transport, and potential for recovery are crucial for maintaining a sustainable supply. A relevant study site to explore questions of environmental behavior and the potential to recover...

Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service

Chemistry of effluent generated during phosphate removal column experiment using iron and steel slag from the Chicago-Gary area of Illinois and Indiana, USA

These data represent the major, minor, and trace element compositions of effluent water samples generated by column experiments of modern and legacy iron and steel slag from the Chicago-Gary area of Illinois and Indiana. Details of the column experiments may be reviewed in the journal article listed in the cross-reference section of this data release titled, "Geochemical Characterization of Iron and Steel Slag and Its Potential to Remove Phosphate and Neutralize Acid".

Categories: Data; Tags: Chicago, Cook County, Gary, Illinois, Indiana, All tags... Indiana Harbor, Lake County, atomic emission spectroscopy, chemical analysis, geochemistry, mass spectroscopy, Fewer tags

Germanium (Ge) is an element deemed critical globally, and used in electronics, communication, and defense applications. The supply of Ge is limited and as demand for it increases, its criticality increases. Germanium is exclusively recovered as a byproduct of either coal mining or zinc (Zn) mining, and the main mineral hosting Ge in Zn deposits is sphalerite (ZnS). However, the mechanisms of Ge enrichment in sphalerite during mineral deposit formation are poorly understood. Therefore, investigations on the mechanisms controlling geologic enrichment of Ge in ores is crucial for maintaining a sustainable supply. For this study, we used a combination of techniques including optical and electron microscopy, synchrotron-based...

Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service

Acid neutralization potential and grain size analysis of modern and legacy iron and steel slag from the Chicago-Gary area of Illinois and Indiana, USA

These data represent the acid neutralization potential and grain size analysis of 13 samples, 2 duplicate samples, of modern and legacy iron and steel slag from the Chicago-Gary area of Illinois and Indiana, USA.

Categories: Data; Tags: Chicago, Cook County, Gary, Illinois, Indiana, All tags... Indiana Harbor, Lake County, geochemistry, grain-size analysis, sieve-size analysis, Fewer tags