| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for determinating ruthenium, osmium, iridium and rhodium contained at low concentration in an intermediate generated in a smelting process of ores, concentrates, and non-ferrous metals. SOLUTION: Nickel powder, sulfur powder, sodium carbonate, borax and silica sand are placed in a crucible together with a sample and mixed therein, heated to melt and cooled to obtain nickel sulfide button. Hydrochloric acid is added to nickel sulfide button, heated to melt and infiltrated to obtain the precipitation. This precipitation is dissolved by using hydrochloric acid, nitric acid and aqueous hydrogen peroxide in the coexistence of tellurium to obtain the determination solution. At least one of the concentrations of ruthenium, osmium, iridium and rhodium in the obtained determination solution is measured by an inductively coupled plasma mass spectrometer, and the concentration of the element in the sample is obtained from the obtained measurement value.</p> |
