Analyses of iron content of the hydrochloric and nitric acid extracts in the ASTM procedure for sulphur forms in coals can be accurately determined by atomic absorption spectrometry. Sulphate ion and sulphuric acid were found not to interfere.
Bibliographical noteFunding Information:
Financial support for this work was provided by the Energy Research and Development Administration-Fossil Energy under contract number E(49-18)1225 and this assistance is gratefully acknowledged. The raw and processedc oal samples were provided by Dr J. 0. Golden and Robert Baldwin of the Department of Chemical and Petroleum Refining Engineeringo f the Colorado School of Mines.