Determination of Carbon Dioxide in Refined Titanium Tetrachloride by Infrared Spectroscopy
SONG Guang-lin1,2, LUO Yun-jun1*, LI Jin-qing1, TAN Hong2
1. School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China 2. Guizhou Academy of Analysis and Testing, Guiyang 550002, China
Abstract：Refined TiCl4 is the key procedure in producing titanium sponge. Besides, the content of carbon and oxygen (C and O) impurities in titanium sponge and that of C and O impurities in refined TiCl4 presents the 4-times enrichment relationship. Therefore, the content control of the C and O impurities in refined TiCl4 becomes the key part for the quality control of titanium material. In order to control the oxygen and carbon, there is the need to analyze the source of Cand O impurities so that strict control can be conducted over the impurities ofrefined TiCl4. Determination of CO2 in refined TiCl4 was significant for analysis of its impurities. CO2 could be determined by infrared spectroscopy due to its infrared characteristic spectrum line. However, normal infrared absorption cell was not fit for the sample analysis, because TiCl4 easily reacted with moisture in the air and immediately was hydrolyzed to form highly corrosive hydrochloric acid smoke. According to Lambert-Beer Law, which means the concentration (cx) and absorbance(A)～length (L) curve’s slope havedirect ratio. The infrared absorption cell with the window film of ZnSe ( 10 mm×1 mm, wavenumers: 7 800～440 cm-1) and the glass cell (optical path: 42, 22, 12, 7 and 4 mm) was assembled and utilized in determination of the CO2 in refined TiCl4 by standard addition method. The detection limit ofCO2 was 0.92 mg·kg-1, the regression equation was Y=0.031 1X,R=0.997 2; With standard addition method, the regression equation of CO2 was Y=0.131 7X, R=0.998 6, it’s good in linearity relation, theCO2 content in refined TiCl4 is determined to be 1.53 mg·kg-1 and SD up to 0.04 mg·kg-1. RSD of the method precision is between 0.53%～1.27%, while recovery rate is between 89.2%～96.8%. This infrared absorption device was safe, simple and convenient, easily removable and washable, and re-useable. The method could conduct the quantitative analysis over the CO2 content in refined TiCl4 through adding standard sample for one time, itcould meet the requirement of determination of CO2 in refined TiCl4.
宋光林1,2，罗运军1*，李晋庆1，谭 红2 . 红外光谱法测定精四氯化钛中二氧化碳的含量 [J]. 光谱学与光谱分析, 2015, 35(03): 626-630.
SONG Guang-lin1,2, LUO Yun-jun1*, LI Jin-qing1, TAN Hong2 . Determination of Carbon Dioxide in Refined Titanium Tetrachloride by Infrared Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(03): 626-630.
