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Quantum Cascade Laser Infrared Spectroscopy for Online Monitoring of Hydroxylamine Nitrate

Journal Article · · International Journal of Analytical Chemistry
DOI:https://doi.org/10.1155/2018/7896903· OSTI ID:1472188
 [1];  [2];  [2]
  1. Oak Ridge National Laboratory, USA, The Bredesen Center at the University of Tennessee Knoxville, USA
  2. Oak Ridge National Laboratory, USA

We describe a new approach for high sensitivity and real-time online measurements to monitor the kinetics in the processing of nuclear materials and other chemical reactions. Mid infrared (Mid-IR) quantum cascade laser (QCL) high-resolution spectroscopy was used for rapid and continuous sampling of nitrates in aqueous and organic reactive systems, using pattern recognition analysis and high sensitivity to detect and identify chemical species. In this standoff or off-set method, the collection of a sample for analysis is not required. To perform the analysis, a flow cell was used for in situ sampling of a liquid slipstream. A prototype was designed based on attenuated total reflection (ATR) coupled with the QCL beam to detect and identify chemical changes and be deployed in hostile environments, either radiological or chemical. The limit of detection (LOD) and the limit of quantification (LOQ) at 3 σ for hydroxylamine nitrate ranged from 0.3 to 3 and from 3.5 to 10 g·L −1 , respectively, for the nitrate system at three peaks with wavelengths between 3.8 and 9.8  μ m.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1472188
Alternate ID(s):
OSTI ID: 1476433
Journal Information:
International Journal of Analytical Chemistry, Journal Name: International Journal of Analytical Chemistry Vol. 2018; ISSN 1687-8760
Publisher:
Hindawi Publishing CorporationCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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