Online fiber-optic spectrophotometry
To improve the timeliness of chemical information and reduce the potential for personnel radiation exposure, the Savannah River Laboratory has developed online absorption spectrophotometers. Absorption spectrophotometers are rugged, precise instruments which, however, are susceptible to interference from other optically absorbing species and to changes in analyte absorbance due to different matrixes. Also, it is difficult and expensive to interface absorption spectrophotometers to SRP's radioactive processes. The fiber-optic spectrophotometer described solves these problems by combining three technologies: fiber optics, diode array spectrophotometers, and multivariate data analysis. A multiplexed fiber-optic light transmission system connects as many as ten process sample locations to a single remote spectrophotometer up to 100 meters distant. In addition to the sample locations, the spectrophotometer is also connected to reference and standard optical cells for online data validation and error checking. For each sample location, the spectrophotometer rapidly collects a series of absorption spectra from 300 to 820 nm. Spectra are tested for sample quality and integrity before analyte concentrations and residual spectra are computed from a multivariate model of the absorption characteristics of the chemical system. Residual spectra are tested to determine if any unknown interference or matrix effect may invalidate concentration results.
- Research Organization:
- Savannah River Lab., Aiken, SC (USA)
- DOE Contract Number:
- AC09-76SR00001
- OSTI ID:
- 5955544
- Report Number(s):
- DP-MS-87-100; CONF-8710168-1; ON: DE88001378
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ACTINIDE COMPOUNDS
CONTROL
DATA ANALYSIS
DESIGN
DISPERSIONS
ELECTRONIC EQUIPMENT
EQUIPMENT
FIBER OPTICS
ION EXCHANGE
MEASURING INSTRUMENTS
MIXTURES
MULTIPLEXERS
NATIONAL ORGANIZATIONS
NITRATES
NITROGEN COMPOUNDS
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
OXYGEN COMPOUNDS
PLUTONIUM COMPOUNDS
PLUTONIUM NITRATES
PROCESS CONTROL
PROCESS SOLUTIONS
SAVANNAH RIVER PLANT
SOLUTIONS
SPECTROPHOTOMETERS
SPECTROPHOTOMETRY
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL NITRATES
US AEC
US DOE
US ERDA
US ORGANIZATIONS