DETERMINATION OF COBALT IN COBALT-DOPED SODIUM CHLORIDE CRYSTALS,
Abstract
Cobalt in low concentrations in single crystals, grown from sodium chloride melts containing cobalt chloride, is rapidly determined, without destroying the crystals, by measuring the absorbance of the 215 -millimicron band. The lower limit for measurement of cobalt by this method is about 10 to the 16th cobalt ions/cc for a crystal piece 1 cm thick. The molar extinction coefficient of the 215 -millimicron absorption band in the crystals is about 7000. Singlesweep polarography is used to calibrate the absorbance by determining the concentration of cobalt in solutions prepared from the cobalt-doped sodium chloric crystals. Cobalt can be determined in sodium chloride solution (0.05 g of NaC1/m1) in concentrations as low as 5 x 10 to the -9 g/ml by single-sweep polarography. This corresponds to 2 x 10 to the 15th cobalt ions/cc of crystal. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 06, 1964
- Accession Number
- AD0617837
Entities
People
- Gerald C. Whitnack
- Marian E. Hills
Organizations
- Naval Air Weapons Station China Lake