Determination of Cr, V and P in Ilmenite by Inductively Coupled Plasma-Atomic Emission Spectrometry with Sodium Peroxide Fusion

An analytical method for the determination of trace elements of Cr, P and V in ilmenite with sodium peroxide by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) is proposed. The sample was digested by sodium peroxide fusion following which, the clear top solution was acidized to measure Cr, P and V by ICP-AES. The optimum instrumental conditions and selection of spectral lines for the elemental analysis were studied. The large dilution of 1000 and calibration standard solution by adding sodium as the matrix were conducted to eliminate the matrix effect. 2 mL HCl was loaded to acidize the sample solution in order to avoid eroding the machine's sampling system by the strong basicity of the solution by sodium peroxide fusion. The detection limit of this method was 4.46-23.55 μg/g. According to the validation by national standard materials, the accuracy of the method (relative error) was less than 10%, and precision (RSD, n=12) was 0.68% to 9.90%. Compared with the spectrophotometer method for single element determination, this method showed many advantages, such as a low detection limit, high sensitivity, a wide measuring range, convenient operation, and was suitable for batch samples.