On-line monitoring of chromium aerosols in industrial exhaust streams by laser-induced plasma spectroscopy (LIPS) |
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| Authors: | R E Neuhauser U Panne R Niessner and P Wilbring |
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| Institution: | (1) Institute for Hydrochemistry, Technical University Munich, Marchioninistrasse 17, D-81377 Munich, Germany e-mail: ulrich.panne@ch.tum.de, DE;(2) TüV Rheinland, Institute for Environmental Protection and Energy Technology, Air Pollution Control Department, Am Grauen Stein, D-51105 K?ln, Germany e-mail: Wilbring@csi.com, DE |
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| Abstract: | Ultrafine heavy metal aerosols can have severe toxic and carcinogenic effects when inhaled in higher concentrations. The
objective of this work was to develop a mobile continuous emission monitor (CEM) based on laser-induced plasma spectroscopy
(LIPS) for an on-line analysis of chromium aerosols. The LIPS emission sensor was installed in an electroplating facility
for a fast monitoring of particulate emissions to provide instantaneous feedback for process control. The prototype was tested
in cooperation with an independent laboratory, which determined the total chromium content and the Cr(VI)/Cr(III) ratio in
the exhaust stream by conventional filter analysis. The system provided both the necessary time-resolution and detection limits
(14 μg m–3) for emission monitoring below the legal threshold (1 mg m–3) values. A good correlation was found between the on-line LIPS measurement and the independent reference analysis.
Received: 22 March 1999 / Revised: 5 May 1999 / Accepted: 11 May 1999 |
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