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Proceedings Paper

Online monitoring of waste water for aromatic hydrocarbons by UV derivative spectroscopy
Author(s): Frank Vogt; Maurus Tacke
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Paper Abstract

The new method 'Dynamic Derivative-Spectroscopy' (DDS) is presented for contamination detection and monitoring in water. As a first application, the selective measurement of aromatic solvents is investigated. The feasibility of the new technique to measure such substances selectively at competitive measurement speed is demonstrated. Selective monitoring is in contrast to the conventional 'Total Organic Carbon'-method (TOC) which determines only the total load of organic carbon in waste water. A measurement in the ultraviolet spectral range is appropriate since water has a high transparency in the effective wavelength range of a commercial Deuterium lamp. Further, DDS is also attractive for process control in chemical industry. To enhance spectral features for discrimination between the single sample components the first and second derivative of the transmission signal are used by DDS. The DDS technique makes use of a small periodic modulation of transmission wavelength of a monochromator to generate these signals in an optical manner. The corresponding modulation of the spectroscopic signal is treated by phase sensitive detection, which results in signals that correspond approximately to the first and second mathematical derivatives of the transmission. Experimental detection limits are below 0.1 mg analyte per liter water by using 10 cm absorption path and 3 minutes measurement time.

Paper Details

Date Published: 10 February 1999
PDF: 8 pages
Proc. SPIE 3534, Environmental Monitoring and Remediation Technologies, (10 February 1999); doi: 10.1117/12.339002
Show Author Affiliations
Frank Vogt, Fraunhofer-Institute for Physical Measurement Techniques (United States)
Maurus Tacke, Fraunhofer-Institute for Physical Measurement Techniques (Germany)

Published in SPIE Proceedings Vol. 3534:
Environmental Monitoring and Remediation Technologies
Tuan Vo-Dinh; Robert L. Spellicy, Editor(s)

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