[ICP-AES method for the determination of active components Mo and Bi in catalyst for acrylonitrile production]

An ICP-AES method for the determination of active components Mo and Bi in catalyst for acrylonitrile production was established and reported in this paper. 0.2 g of the sample was dissolved with 5 mL of aqua regia and 8 mL of HF at 75 degrees C on a water bath and evaporated till dry to expel SiF4. The residue was dissolved and made volume with 3% HCL up to 100 mL. The solution was prepared for Bi determnination. Successively diluted with 3% HCL for 10 times the solution was used for Mo determination. Spectral interferences were investigated in detail by means of profiling the analytical lines with wavelength scanning of the blank and coexisting elements in the vicinity of the lines. Three Mo lines, MoII 202.030, MoII 203.844 and MoII 204.598, and two Bi lines, BiII 190.241 and BiI 223.061 were selected as the analytical lines considered free of spectral interferences. Utilizing multiple lines in a full spectrum for simultaneous determination of one element is of benefit to the improvement of accuracy and precision of the analysis. The method has been successfully used for monitoring the activity of the catalyst in acrylonitrile production.