Abstract：The mutual interference of CO+ (m/z=28) and N2+ (m/z=28) usually existed in mass spectrometric analysis. Therefore, C+ (m/z=12) and N+ (m/z=14) were commonly used as the analytical lines of CO and N2 in the simultaneous analysis of CO and N2. It was found that, however, certain amount of CO++( m/z=14) possibly had interference with N+ (m/z=14). In other words, during the determination of gas containing CO and N2 under same experimental conditions, the ionic intensity at N+ (m/z=14) would be comprised of CO++ and N+ jointly, influencing the detection of N2. Based on the problem above, the interference of CO++ to N+ was investigated. The corresponding mathematical correction model was established. Firstly, various amounts of CO standard gas were used to establish the ionic intensity equation between CO++ and C+ to obtain the relationship curve. Secondly, the content of CO++ could be calculated, so the accurate content of N+ could be obtained. Then, the content of N in sample could be obtained. The established correction model was used on pulse melting time-of-flight mass spectrometer with own invention patent to analyze O and N in metal. The effect was significant especially for the analysis with the existence of high content O in metal. This method could be also applicable for the on-line determination of CO and N2 in industrial process.
杨植岗, 沈学静, 王 蓬, 胡少成, 马红权, 王海舟. 氧氮联测技术中CO++对N+质谱干扰校正方法建立及应用[J]. 冶金分析, 2013, 33(3): 1-8.
YANG Zhi-gang, SHEN Xue-jing, WANG Peng, HU Shao-cheng,MA Hong-quan, WANG Hai-zhou. Establishment of correction method of mass spectrometry interference of CO++ to N+ in determination of oxygen and nitrogen and its application. , 2013, 33(3): 1-8.
［1］ Wang Peng, Shen Xuejing, Hu Shaocheng, et al. Inert gas fusion-time-of-flight mass spectrograph—A novel analytical instrument of gas in metallurgical materials［C］.第13届中国金属学会分析测试分会学术年会, 2006.
［5］ Wei Gao, Zhengxu Huang, Huiqing Nian,et al. A novel gas analysis system for metallurgical materials based on time-of-flight mass spectrometry［J］. International Journal of Mass Spectrometry,2010, 294:77-82.
［6］ Xuejing Shen,Peng Wang, Shaocheng Hu, et al. Simultaneous determination of oxygen, nitrogen and hydrogen in metals by pulse heating & time of flight mass spectrometric method［J］. Talanta,2011, 84:1057-1062.
［7］ Wang Peng, Hu Shaocheng, Yang Zhigang, et al. Determination of Ar in titanium alloy & nano powder by inert gas fusion -time of flight mass spectrograph method［C］. 8th International Workshop of CETAS, Luxembourg, 2011:175-181.
［8］ 原怀保,李月红. 脉冲红外法测定难熔金属钛中氧含量［J］. 光谱实验室(Chinese Journal of Spectroscopy Laboratory),2012,(3),1442-1445.
［9］ 高伟, 黄正旭, 周振, 等. 电子轰击源垂直加速式飞行时间质谱仪的研制［J］. 质谱学报(Journal of Chinese Mass Spectrometry), 2008, 29(4): 209-212,217.
