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SPECTOPHOTOMETRIC STUDIES OF CHLOROCOMPLEXES OF NICKEL (II) AND COBALT (II) IN MOLTEN LICL-KCL EUTECTIC WITH A NEW MODERN HIGHTEMPERATURE ASSEMBLY,
HOLMAN (JOHN F) CO INC WASHINGTON D C
A high-temperature cell assembly for spectrophotometric studies of molten salts was designed and constructed. The absorbances were measured without correction over the wide range of wavelengths from 0.3-2.5 microns and on temperatures to 800C with its control of 0.5 percent. The absorption spectra of nickel and cobalt chlorides in LiCl-KCl eutectic were studied for these wavelengths at temperature ranges of 360-700C. During the melting period, nickel and cobalt, which show absorption of 3d electrons, showed strong effects by sintering of the salt solutions. At below 390C special spectral changes were noted. However, above 400C the spectra are stable, since the solutions are completely molten, but the nickel chlorocomplex showed multi-existence, and at a temperature of 500C it finally became a single complex. The reproducibility of spectra at each temperature was good and showed promising signs for analytical applications. Author
Trans. of Bunseki Kagaku (Japan) v14 p519-26 1965.