ICP-AES Determination of Manganese in Ferromanganese

A method of ICP-AES determination of Mn in ferromanganese was proposed. The sample was fused with a mixture of NaOH and Na2O2, and leached with HCl. The sample solution obtained was diluted 25 times and determined at the analytical spectral line at the wavelength of 293.306 nm. Interferences were eliminated by drift correction and by correction with standard material. The proposed method was applied to the analysis of CRM′s of ferromanganese with high and low carbon contents, giving results in consistency with their certified values. Values of RSD′s (n=7) found were kept in the range of 0.16%-0.31%.