Accession Number : AD0617837

Title :   DETERMINATION OF COBALT IN COBALT-DOPED SODIUM CHLORIDE CRYSTALS,

Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF

Personal Author(s) : Hills,Marian E. ; Whitnack,Gerald C.

Report Date : 06 NOV 1964

Pagination or Media Count : 12

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)

Descriptors :   (*SODIUM COMPOUNDS, CHLORIDES), (*COBALT, CHEMICAL ANALYSIS), SINGLE CRYSTALS, IMPURITIES, ABSORPTION SPECTRA, POLAROGRAPHIC ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE