E.Y. Campbell L. Paul Greenland 1973 <div id="aep-abstract-id4" class="abstract author"><div id="aep-abstract-sec-id5"><p id="simple-para.0010">Rocks containing 10–140 ng of indium per g are decomposed with hydrofluoric and nitric acids in the presence of<span>&nbsp;</span>¹¹⁴In. Indium is separated from other constituents by sequential extractions of the bromide, cupferronate, and acetylacetonate, and is then reacted with a substoichiometric amont of EDTA. Excess of indium is removed by acetylacetone extraction and the specific activity of the complexed fraction is determined by counting<span>&nbsp;</span>¹¹⁴In. Analyses of the U.S.G.S. standard rocks are reported. These show good agreement with previous neutron activation analyses. Repetitive rock analyses indicated an analytical precision of ±4–7%.</p></div></div> application/pdf 10.1016/S0003-2670(01)80230-0 en Elsevierr Determination of indium in rocks by substoichiometric radioisotope dilution analysis article