Standard method of test for thorium in water and waste water

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Annu. Book ASTM Stand.; (United States)

OSTI ID:7353129

Thorium in water and waste water is determined spectrophotometrically using 1-(o-arsonophenylazo)-2-naphthol-3,6-disulfonic acid as the coloring reagent. The characteristic color is measured at 545 nm, and the method is sensitive to less than 1 x 10/sup -9/ g of Th in 1g of water. The single operator precision of the method is approximately 1 percent. A preliminary separation of Th from the water by coprecipitation with Ca as the oxalate salt is necessary. Fe/sup 3 +/ is the primary interference, and its effect can be minimized by adding hydroxylamine and boiling the test solution to reduce the Fe/sup 3 +/. (BLM)

• OSTI ID: 7353129
• Journal Information: Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 45; ISSN ASTSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
ABSORPTION SPECTROSCOPY
ACTINIDES
CHEMICAL ANALYSIS
COPRECIPITATION
ELEMENTS
HYDROGEN COMPOUNDS
INTERFERING ELEMENTS
LIQUID WASTES
METALS
OXYGEN COMPOUNDS
PRECIPITATION
SENSITIVITY
SEPARATION PROCESSES
SPECTROSCOPY
THORIUM
WASTE WATER
WASTES
WATER