Determination of high content copper in carbon/carbon-silicon carbide composites modified with copper-titanium by flame atomic absorption spectrometry
ZOU Ai-lan1, WEI Qiu-yun2, LU Yu-hai3
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; 2.College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 3. State Key Laboratory of Powder Metallurgy Institute,Central South University, Changsha 410083, China
Abstract：The main components of carbon/carbon-silicon carbide (C/C-SiC)composites modified with copper-titanium were copper, titanium, carbon and silicon, and it was insoluble by conventional method. The sample was firstly burned at 800-820 ℃ for 20 min to eliminate the interference of carbon, then transferred from ceramic crucible to corundum crucible for alkali fusion, and at last further dissolved by hydrofluoric acid and nitric acid. Based on this, a method for the determination of copper in C/C-SiC composites modified with copper-titanium was established by flame atomic absorption spectrometry with the test medium as 2.0% hydrofluoric acid. It showed that, the concentration of copper kept a fine linear relationship with the absorbance within the range of 2-12 μg/mL with the linear regression equation of y=0.015 31+0.059 66x and linear correlation coefficient of R=0.999 4. The detection limit was 0.011 2 μg/mL. The self-made sample FL-2 and internal control sample C6 of C/C-SiC composites modified with copper-titanium were determined by the proposed method respectively. The results were consistent with the reference values or that by iodometry, and the relative standard deviation (RSD, n=6 or 12) was 0.39% and 1.1% respectively.
邹爱兰,韦秋云,逯雨海. 火焰原子吸收光谱法测定铜-钛改性的碳/碳-碳化硅复合材料中高含量铜[J]. 冶金分析, 2014, 34(9): 20-23.
ZOU Ai-lan, WEI Qiu-yun, LU Yu-hai. Determination of high content copper in carbon/carbon-silicon carbide composites modified with copper-titanium by flame atomic absorption spectrometry. , 2014, 34(9): 20-23.
