| Iridium powder samples were digested by hydrochloric acid and potassium chlorate under high temperature and high pressure. 15 impurities were determined by inductively coupled plasma atomic emission spectrometry. Spectral interference, selection of spectral lines, method recovery, precision experiments and matrix matching experiment were investigated. The results showed that the iridium matrix had serious spectral interference on some spectral lines of some impurities, and that the spectral interference was eliminated by selecting an appropriate wavelength and background points. The determination range of impurity elements is from 0.001% to 0.10%, and their recovery rates of standard addition are 87%~109%, and the relative standard deviation (precision) is 0.8% to 6.9%. The direct determination is equivalent to the matrix matching determination. The method can meet the determination requirements of platinum, palladium, rhodium, ruthenium, gold, silver, copper, iron, nickel, aluminum, lead, manganese, magnesium, tin and zinc impurities in iridium powder samples. |
