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1983年Slavin等提出了“特征质量”(m_0)的概念,即产生0.0044 A.s积分吸光度信号时所对应的待测元素量,用pg表示。目前,特征质量已被用为石墨炉原子吸收绝对分析(或无标样分析)的定量基准,其理论计算也受到人们的重视。L’vov等提出了计算稳定温度平台炉(STPF)中待测元素特征质量的理论模型,但未涉及因塞曼效应引起谱线分裂所带来的影响。本文将在L’vov模型的基础上,综合考虑多普勒增宽、压致增宽、超精细结构和塞曼分裂对吸收谱线轮廓的影响,结合光源发射线轮廓,建立计算塞曼石墨炉原子吸收分析中特征质量的通用方法,并将计算结果与管壁原子化实验值相比较。
In 1983, Slavin et al. Proposed the concept of “characteristic mass” (m_0), that is, the amount of the element to be measured corresponding to the 0.0044 A.s. integral absorbance signal, expressed in pg. At present, the quality of features has been used as a quantitative basis for absolute analysis of graphite furnace atomic absorption spectrometry (or no standard analysis), the theoretical calculations have also been people’s attention. L’vov et al. Proposed a theoretical model for calculating the characteristic mass of the element to be measured in a stable temperature platform furnace (STPF), but did not deal with the influence of spectral splitting caused by the Zeeman effect. Based on the L’vov model, the effects of Doppler broadening, pressure broadening, hyperfine structure and Zeeman splitting on the absorption line profile are considered in this paper. Combined with the contour of the emission line, Furnace atomic absorption analysis of the characteristics of the general method, and the calculated results with the tube wall atomic value comparison.