ICP-AES Determination of Chromium, Cobalt, Nickel, Gallium, Scandium and Zirconium in the High Titanium Vanadium Slag

The sample (1.000 0 g) of the high titanium vanadium slag was placed into a 250 mL beaker, and then the wall of the beaker was rinsed with 5 mL of water and the sample was dispersed. 2.5 mL of HF, 15 mL of HCl and 5 mL of HNO₃ were added and the mixture was heated to boil to produce uniform large bubbles. 5 mL of H₂SO₄ (1+1) solution was added, and then the solution was heated at high temperature to fumes of SO₃ for 3-5 min. After cooling, 15 mL of water was added and the solution was heated to boil. After cooling to room temperature, the solution was made its volume up to 100 mL with water. Inductively coupled plasma atomic emission spectrometry (ICP-AES) was used to determine 0.001%-3.0% (w) chromium and 0.001%-0.300% (w) of cobalt, nickel, gallium, scandium and zirconium in the above solution. Matrix matching and synchronous background correction were combined to eliminate the influence of matrix composition, and the analytical spectral lines, background correction region and the working parameters of spectrometer were selected. Detection limits (3s) of elements were in the range of 0.000 1%-0.000 2%, and values of RSDs (n=8) were all less than 25%. The samples were analyzed by the proposed method, giving results in consistency with the results of ICP-MS.