Published August 1990 | Version v1
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Time-resolved laser-fluorimetry in inline process analysis - as tested for uranium analysis in reprocessing solutions

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Description

Time-resolved laser-fluorimetry was shown to be a sensitive, fast and nondestructive methode for continuous process-monitoring. This was demonstrated by the analysis of uranium in reprocessing solutions. The time-resolved methode is less matrix dependent than other fluorimetric measurements. Furthermore no problems arise with the analysis of flowing systems or with signal transmission by glas fibers. The applicability of the method was demonstrated with a laboratory setup of the uranium purification step in nuclear fuel reprocessing. The uranium concentration was monitored continuously in the outlet of the purification column, the break through of the column was indicated. Maximal flow rates of 140 ml/min. were used in the experiments, the detection limit of uranium in 3 M nitric acid was found to be 2.5 μg/ml. (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Am Beispiel der Uran-Konzentrationsbestimmung im Wiederaufarbeitungsprozess konnte gezeigt werden, dass die zeitaufgeloeste Laserfluorimetrie als empfindliche, schnelle und zerstoerungsfreie Methode fuer die kontinuierliche in-line Ueberwachung eines Prozesses geeignet ist. Messungen im Durchfluss und die Signaluebertragung ueber Lichtleiter sind problemlos moeglich. Besondere Vorteile, auch gegenueber anderen fluorimetrischen Verfahren, ergeben sich aus der relativen Matrixunabhaengigkeit der zeitaufgeloesten Messung. Als Test fuer das Verfahren wurde die Uran-Konzentration im Auslauf einer Uran-Feinreinigungskolonne in Laboranordnung kontinuierlich ueberwacht und der Saeulendurchbruch registriert. Die in dieser Anordnung maximal verwendete Durchflussgeschwindigkeit betrug 240 ml/min, die Nachweisgrenze der vorhandenen Apparatur fuer Uran in 3 M Salpetersaeure ergab sich zu 2,5 μg/ml. (orig.)

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Additional details

Additional titles

Original title (German)
Zeitaufgeloeste Laser-Fluorimetrie in der in-line Prozessanalytik am Beispiel der Uranbestimmung im Wiederaufarbeitungsprozess

Publishing Information

Imprint Pagination
36 p.
Report number
KFK--4782

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
22002489
Subject category
S11: NUCLEAR FUEL CYCLE AND FUEL MATERIALS;
Descriptors DEI
ABSORPTION SPECTRA; EMISSION SPECTRA; FLUORESCENCE SPECTROSCOPY; FLUORIMETERS; LASER SPECTROSCOPY; LUMINESCENCE; ON-LINE MEASUREMENT SYSTEMS; PUREX PROCESS; QUANTITATIVE CHEMICAL ANALYSIS; REPROCESSING; SOLUTIONS; URANIUM
Descriptors DEC
ACTINIDES; CHEMICAL ANALYSIS; DISPERSIONS; ELEMENTS; EMISSION; EMISSION SPECTROSCOPY; HOMOGENEOUS MIXTURES; MEASURING INSTRUMENTS; METALS; MIXTURES; ON-LINE SYSTEMS; PHOTON EMISSION; SEPARATION PROCESSES; SPECTRA; SPECTROSCOPY