PRECIPITATION OF SUBMICROGRAM QUANTITIES OF THORIUM BY BARIUM SULFATE AND APPLICATION TO FLUOROMETRIC DETERMINATION OF THORIUM IN MINERALOGICAL AND BIOLOGICAL SAMPLES
An efficient method is described for the separation of thorium from relatively large biological and mineralogical samples. From 100 to 10/sup -5/ mu g of thorium is precipitated to better than 99.5% by 25 mg of barium or other elements forming insoluble sulfates from 75-ml volume. The separation takes place from strongly acidic solutions and is not affected appreciably over a wide range of experimental conditions. The barium sulfate is dissolved in alkaline DTPA and the thorium is determined directly in the alkaline solution by a fluorometric procedure, which was applied to the following types of samples with the detection limits indicated: rocks, 2 x 10/sup -6/%; bone ash, 5 x 10/sup -7/ %; feces, liver, and grain, 2 x 10/sup -8/%; urine, 10/sup -11/ gram per ml; and blood 2 x 10/sup -10/ gram per ml. (P.C.H.)
- Research Organization:
- Atomic Energy Commission, Idaho Falls, Idaho
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-011988
- OSTI ID:
- 4117375
- Journal Information:
- Anal Chem., Journal Name: Anal Chem. Vol. Vol: 36
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
Improvements in the Fluorometric Determination of Submicrogram Quantities of Beryllium
FLUOROMETRIC DETERMINATION OF SUBMICROGRAM QUANTITIES OF BERYLLIUM IN ORE