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An experimental set-up for detection of elemental chlorine in chlorinated hydrocarbons (CHCs) was realised with the aim of developing a miniaturised system, which could be used for on-line monitoring of chlorinated compounds. It was shown that with an optimised time-resolved detection chlorine from CHCs such as CCl(4) can be determined by laser induced breakdown spectroscopy (LIBS) with ppm-detection limits in the gas phase. Application of a miniaturised Nd:YAG laser resulted only in a minor loss in performance, hence it could be used for designing a rugged and small on-line sensor. In addition, preliminary results for the detection of chlorine via the formation of CuCl in the plasma formed by focusing the laser on a copper surface are reported. Utilising the luminescence of the CuCl D-system at 440 nm, a tenfold improvement in the detection limits was obtained. It appears that the formation of small molecules in a laser plasma could be a promising alternative for selective and sensitive analysis of gaseous chlorinated and other species.

Additional information

Authors: HAISCH C, Technical University Munich, Institute of Hydrochemistry (DE);NIESSNER R, Technical University Munich, Institute of Hydrochemistry (DE);MATVEEV O I, JRC Ispra (IT);PANNE U, JRC Ispra (IT);OMENETTO N, JRC Ispra (IT)
Bibliographic Reference: Article: Fresenius' Journal of Analytical Chemistry (1995)
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