Abstract

The preparation and properties of a semisolid nickel sulfate-sorbitol complex are described. The absorbance curve of the complex corresponds closely with that of an approximately saturated solution of hydrated nickel sulfate in water with the advantage of a two-fold increase in absorbancy index at the peak absorption. Used as a filter component it eliminates the undesirable properties of a liquid filter. A freshly made 3.5-mm thickness of complex had an average transmittance at 2850 A of 75% which showed a slight decrease after three years. An appreciable loss of transmittance after nine years arises from the development of an absorption band at 2850 A. The relationship of this band with a temperature-sensitive band in water solutions of pure nickel sulfate is discussed. The filter remains visually clear indicating that the complex has not crystallized in nine years.

© 1956 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1

Absorbance curves. The solid line —— is that of a nickel sulfate-sorbitol sandwich between a 9863 Corex glass and a fused quartz plate. The short dashed – – – – – line is that of a nickel sulfate-sorbitol sandwich between fused quartz.

Fig. 2
Fig. 2

Effect of dilution with water on the absorbance of the nickel sulfate-sorbitol complex; concentrations on weight per volume basis.

Fig. 3
Fig. 3

Absorbance curves A1 and A2 for two nickel sulfate-sorbitol filters which have aged nine years compared with that for a freshly prepared nickel sulfate-water solution, B(10g/29 cc in a 50-mm path). A1 complex between quartz, and A2, between Corex 9863 and quartz.

Fig. 4
Fig. 4

Reversible temperature effect of the absorbance of a nickel sulfate solution, (10 g/29 cc in a 50-mm path). The lowest curve at room temperature, highest curve at about 70°C, intermediate curves at intermediate temperatures.

Fig. 5
Fig. 5

Distillation apparatus used in preparing the nickel sulfate-sorbitol complex. A. To Manometer 1 and vacuum pump. B. Solid CO2 and ice water traps. C. Manometer 2. D. NiSO4-sorbitol solution in 250 cc bulb on a hot water bath. E. 10/30 ground glass joint. See text.