Study of ammonium uranates by X-ray diffraction and diffuse reflectance infrared spectrometry

Lin, C.Y.; Yeh, Yu-Chai; Griffiths, Peter R.

doi:10.1007/bf02046617

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…The most common methods of uranium ore processing use ammonium hydroxide as a precipitating reagent and produce AU (commonly referred to as ADU) products, which have the general formula (NH 4 ) 2 U 2 O 7 , UO 3 · x H 2 O · y NH 3 , or UO 2 (OH)2· x H 2 O· y NH 3 . 16,19,20,28 The spectra of several AU samples are given in Fig. 3, with the NIR1 and NIR2 ranges presented separately due to the shift in the detector response.…”

Section: Resultsmentioning

confidence: 99%

“…Infrared spectroscopy of UOC materials to characterize the different classes of UOC materials has been reported by several different groups. 13–20 Eidson investigated synthesized mixtures of ADU and U 3 O 8 by transmission infrared (IR) spectroscopy with the goal to determine speciation in urine samples. 13 Kim et al used attenuated total reflectance (ATR) IR spectroscopy of uranium oxides to determine the oxygen-to-uranium (O/U) ratio, which was varied by heating in air.…”

Section: Introductionmentioning

confidence: 99%

“…15 Reaction mechanisms to produce ammonium uranates (AUs) were studied with diffuse reflectance IR spectroscopy by Lin et al, while Rofail investigated ammonium uranyl carbonates (AUCs) by IR spectroscopy and provided band assignments for vibrational modes of ammonia (NH 3 ), carbonate (CO 3 ), and U species. 16,17 Deane examined hydrated uranium oxides (UO x ) and ADUs. 18 Hausen provided a review of methods used to characterize and classify yellowcake samples by X-ray diffraction (XRD), IR spectroscopy, and differential thermal analysis (DTA) and summarized various protocols and processes.…”

Section: Introductionmentioning

confidence: 99%

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Application of Visible/Near-Infrared Reflectance Spectroscopy to Uranium Ore Concentrates for Nuclear Forensic Analysis and Attribution

et al. 2013

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Uranium ore concentrates (UOCs) are produced at mining facilities from the various types of uranium-bearing ores using several processes that can include different reagents, separation procedures, and drying conditions. The final UOC products can consist of different uranium species, which are important to identify to trace interdicted samples back to their origins. Color has been used as a simple indicator; however, visual determination is subjective and no chemical information is provided. In this work, we report the application of near-infrared (NIR) spectroscopy as a non-contact, non-destructive method to rapidly analyze UOC materials for species and/or process information. Diffuse reflectance spectra from 350 to 2500 nm were measured from a number UOC samples that were also characterized by X-ray diffraction. Combination and overtone bands were used to identify the amine and hydroxyl-containing species, such as ammonium uranates or ammonium uranyl carbonate, while other uranium oxide species (e.g., uranium trioxide [UO3] and triuranium octoxide [U3O8]) exhibit absorption bands arising from crystal field effects and electronic transitions. Principal component analysis was used to classify the different UOC materials.

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