ICP-AES Determination of Calcium,Magnesium,Iron,Titanium and Potassium in Alumina Refractories

Sample of alumina refractory was fused with a mixture of Li2CO3 and boric acid (2+1),and the melt was dissolved in HCl (1+1).An aliquot of the sample solution was taken and used for ICP-AES determination of contents of Ca,Mg,Fe,Ti and K after dilution to a definite volume.Working conditions of the instrument and choice of the analytical spectral lines were studied and optimized.The matrix interference was eliminated by the matrix-matching method and by using the program of spectral interference correction given in the software of the instrument.Precision of the method was tested on 2 samples with different contents of the 5 elements for 10 determinations,values of RSD′s found were all less than 4%.Values of detection limit (3S/N) found for the 5 elements were in the range from 0.004-0.06 mg·L-1.The proposed method was used in the analysis of standard samples giving results in consistency with the standard values.