Determination of impurity elements in titanium sponge by direct current glow discharge mass spectrometry
ZHANG Ping1, FU Liang*2, LIU Hong-wei1
1.College of Material and Chemical Engineering,Hunan Institute of Technology,Hengyang 421002,China; 2.College of Chemistry and Chemical Engineering,Yangtze Normal University,Chongqing 408100,China
Abstract：The titanium sponge sample was pressed for sample preparation. Due to the lack of proper standard samples, the determination results were corrected with typical RSFX value obtained by several metals. The analysis method of 32 trace impurity elements (including Be, B, C, N, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Y, Zr, Nb, Mo, Sn, Sb, Pb and Bi) in titanium sponge by direct current glow discharge mass spectrometry (GD-MS) was established. The influence of discharge parameters on sensitivity and stability of analytical signals was investigated. The optimized discharge parameters were listed as follows: the glow discharge current was 38 mA, the discharge voltage was 650 V, the discharge gas flow rate was 450 mL/min, and the pre-sputtering time was 30 min. The content of K was determined under high resolution (HR, R=10 000) mass spectrometry mode by selecting the proper isotopes. Other elements were determined under moderate resolution (MR, R=4 000) mode to eliminate the mass spectrometry interference. The experimental method was applied to the determination of 32 impurity elements in actual titanium sponge sample. The relative standard deviations (RSD, n=10) were between 3.3% and 30%. The determination results of main metal impurity elements were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The proposed method was used to analyze commercial grade-0 (Sample 1) and grade-1 (Sample 2) titanium sponge samples. The found results were consistent with the content requirements in national standard (GB/T 2524—2010). Therein, the analytical results of Fe、Si, Cl, C, N, O, Mn and Mg were consistent with those obtained by national standard (GB/T 4698—2011).
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