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8 - Uranium

*All listed packages are sold separately.

 

5D – U3O8 Assay DNC (0.1 ppm – 1 % U3O8)

Total Uranium can be determined by delayed neutron counting using an automated system at a nuclear reactor. The principle advantage of this is to provide very rapid and accurate assays for high volumes of samples at a very low cost. The upper limit of this technique is 1% U3O8. Results can be reported as U or as U3O8. From 1 to 10% U3O8, fusion XRF will provide the best quality results and above 10%, U3O8 titration is recommended for accuracy.

 

8 – U3O8 Titration (> 10% U3O8)

For samples greater than 10 % U3O8, analysis by titration is recommended.

 

Acid Digestions

Acid digestion using both aqua regia "partial" and 4-acid "near total” digestion with ICP/MS is also possible but uranium in resistate phases (zircon, monazite, etc.) may not be included in the assays. Hydroflouric acid is used in the digestion and some uranium may be volatilized due to combination with the HF.

           

8 – U3O8 Aqua Regia "Partial" Digestion by ICP/MS

0.5 grams of sample is weighed into disposable test tubes and digested with aqua regia at 95 °C in a microprocessor controlled hot block for two hours. Samples are diluted volumetrically and analyzed by ICP/OES or can be analyzed by ICP/MS. This digestion may not be total as silicates and resistate minerals like zircon, monazite, xenotime are not dissolved. Calibration is achieved by using certified Canmet reference materials. Blanks and control standards are run throughout the analytical run.

 

8 – U3O8 4-Acid “Near Total” by ICP/MS

0.25 grams of sample is weighed into Teflon test tubes and digested with nitric-perchloric-hydrochloric-hydroflouric acids at 260 oC in a microprocessor controlled hot block for 16 hours. Samples are diluted and analyzed by analyzed by ICP/MS. This digestion may not be total as silicates and resistate minerals like zircon, monazite, xenotime may not be totally dissolved. Calibration is achieved by using certified Canmet reference materials. Blanks and control standards are run throughout the analytical run. Uranium may be partially volatile as UF6 can be formed and is volatile. We do not recommend this as a good analytical method for total U3O8.

 

 

8 – U3O8 Assay by XRF (0.005% – 10 % U3O8)

A 0.75 gram sample is roasted then fused with a combination of lithium metaborate/ tetraborate and fused in platinum crucibles. The fusion mix is poured into platinum dishes to form 40 mm glass discs. These discs are analyzed on a Panalytical Axios Advanced XRF. Uranium is calibrated using Canmet certified reference materials. Blanks and control standards are run throughout the analytical run as are preparation duplicates made from a new pulp. The analytical range is 0.05 %-10 % U. The best precision is achieved from 0.5%-10%.

Geochem V, U by XRF Pressed Pellet

Low levels of V and U can be analyzed by pressed pellet XRF.

Element

Detection Limit  (ppm)

V

5 – 10,000

U

5 – 10,000

 

 

5D – Peroxide Boron (>2ppm)

Analysis of B is performed by sodium peroxide fusion and ICP/MS.

 


Activation Laboratories Ltd. | 41 Bittern Street, Ancaster, Ontario, L9G 4V5, Canada | TF: +1.888.228.5227
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