Quantitative determination of titanium tetrachloride and dichloromethane by Raman spectroscopy using carbon disulfide as internal standard

Analytical method for quantitation of titanium tetrachloride and dichloromethane in their mixtures was established by Raman spectroscopy. The cheap glass sampling pipe was used as carrier for Raman spectroscopy measurement. The Raman peak height of carbon disulfide was used as the internal standard to remove the interference factors such as sampling pipe diameter, temperature, laser power and other effect from the instrument. The peak height ratio between the Raman characteristic line of titanium tetrachloride or dichloromethane and that of carbon disulfide was proportional to the analyte concentration. The equations of standard curve was y=0.02028+5.04909x with an R2 of 0.9986 at 387 cm-1 band for titanium tetrachloride determination. And the equations of standard curve was y=0.00097+0.26647x with R2 of 0.9975 at 706 cm-1 band for dichloromethane determination. The concentration of standard samples was calculated using these standard curves and the reproducibility is good with the RSEP value of 4.25% and 2.59% respectively for determining titanium tetrachloride and dichloromethane concentration. The established method was used to analyze the concentration of titanium tetrachloride and dichloromethane in samples obtaining from gas-liquid equilibrium still. These results were in good agreement with results obtained by Infrared spectroscopy.