Curtis A. Palmer

TL;DR: In this paper, 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 about 42 elements.

TL;DR: In this article, the effects of combustion and leaching on 30 elements were analyzed using eight Argonne Premium Coal samples and two other coal samples, and the results were used to infer the modes of occurrence of these elements.

TL;DR: Peat has been studied in several geologic settings: (1) glaciated terrain in cold temperate Maine and Minnesota, U.S.A., (2) an island in the Atlantic Ocean off the coast of Maine, where sea level is rising; (3) the warm temperate United States Atlantic and Gulf Coastal Plains, and (4) the tropical coast of Sarawak, Malaysia, and the tropical delta of the Batang Hari River, Sumatra, Indonesia.

TL;DR: In this article, an integrated analytical approach has been used to determine the mode of occurrence of arsenic in samples of four widely used US coals: the Pittsburgh, Illinois #6, Elkhorn/Hazard, and Wyodak.

TL;DR: The mode of occurrence of chromium in three US bituminous coals and one US subbituminous coal has been examined using both X-ray absorption fine structure (XAFS) spectroscopy and a selective leaching protocol supplemented by scanning electron microscopy (SEM) and electron microprobe measurements as discussed by the authors.