Chlorine Analysis by Diode Laser Atomic Absorption Spectrometry
Chlorine Analysis by Diode Laser Atomic Absorption Spectrometry作者机构：Inst. Spectrochemistry Appl. S. Bunsen-Kirchhoff-Street 11 D-44139 Dortmund Germany
出 版 物：《光谱学与光谱分析》 (Spectroscopy and Spectral Analysis)
年 卷 期：2000年第20卷第2期
页 面：149-155页
核心收录：
学科分类：07[理学] 070302[理学-分析化学] 0703[理学-化学]
主 题：Chlorine analysis Gas chromatography Laser ablation Diode laser atomic absorption spectrometry
摘 要：The general characteristics of Diode Laser Absorption Spectrometry (DLAAS) in low pressure plasmas particulary with respect to the detection of non metals are comprehensively recapitulated and discussed. Furthermore, a detector, which is based on DLAAS in a microwave induced low pressure plasma as an alternative technique for halogene specific analysis of volatile compounds and polymeric matrices is described. The analytical capability of the technique is demonstrated on the chlorine specific analysis of ablated polymer fragments as well as gas chromatographically separated hydrocarbons. Since the measurements were carried out by means of a balanced heterodyne detection scheme, different technical noise contributions, such as laser excess and RAM noise could efficiently be suppressed and the registered absorption was limited only by the principal shot noise. Thus, in the case of the polymer analysis a chlorine specific absolute detection limit of 10 pg could be achieved. Furthermore, fundamental investigations concerning the influence of hydrocarbons on the dissociation capability of the microwave induced plasma were performed. For this purpose, the carbon , chlorine and hydrogen specific stoichiometry of the compounds were empirically determined. Deviations from the exspected proportions were found to be insignificant, implying the possibility of internal standardization relative to the response of a reference sample.
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