ICP-AES Determination of 5 Chemical Components in Chromium Ores

ICP-AES was applied to the determination of Fe, Al, Si, Mg and Ca in chromium ores. The sample was fused with mixed flux of Na2CO3, K2CO3 and Na2B4O7 (2+2+1, mass ratio) and the melt was dissolved with dil. nitric acid (15+80). An aliquot of the sample solution was taken for ICP-AES analysis. The spectral lines of 393.37 nm, 251.61 nm, 271.44 nm, 396.15 nm and 279.55 nm were selected for determination of Ca, Si, Fe, Al and Mg respectively. National standard samples (BGBW 07201 and GSBD 33001.3) were used for preparation of standard curves. As a check for the feasibility of the present method, 3 standard and known samples were analyzed, the results obtained were in consistency with the certified or known values, with values of recovery and RSD′s (n=6) in the ranges of 99.0%-101.5% and 0.05%-0.78% respectively.