Comparison of extraction abilities of different extractants used in liquid-liquid extraction and gas chromatography for determination of trace carbon tetrachloride in hydrolytic system of titanium tetrachloride
Li Q.,Guizhou Academy of Analysis Test |
Li Q.,Guizhou University |
Song G.-L.,Guizhou Academy of Analysis Test |
Tan H.,Guizhou Academy of Analysis Test |
And 3 more authors.
Yejin Fenxi/Metallurgical Analysis
The extraction effects of four extractants liking heptane, n-hexane, n-octane and iso-octane used for the extraction of trace carbon tetrachloride in the determination trace carbon tetrachloride in the hydrolytic sample of refined titanium tetrachloride by liquid-liquid extraction gas chromatography were compared. The four extractants all exhibited fine response to carbon tetrachloride and gave good peak positions and peak shapes in the chromatograms. The coexisting impurities including chloroform, chloroacetyl chloride and trichloroacetyl chloride in titanium tetrachloride didn't interfere in the determination of carbon tetrachloride.For heptane, n-hexane, n-octane and iso-octane, the linear correlation coefficients of the calibration curves were 0.990 8, 0.997 2, 0.998 7 and 0.999 5, the detection limits were 0.003 2, 0.001 5, 0.004 4 and 0.001 1, the sample standard average recoveries were 95.4%, 98.8%, 96.4% and 99.6% and the relative standard deviations were 2.6%, 4.0%, 4.6% and 1.6%, respectively. Thus, the four extractants all had satisfactory extraction capacity for carbon tetrachloride, but iso-octane had the best extraction capacity and better stability. Source