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Control of Humidity with Potassium Hydroxide, Sulphuric Acid, or other Solutions

  • M. E. Solomon (a1)

Methods of preparing solutions of graded density for the accurate control of atmospheric relative humidity are described, and some pitfalls in their use and in the use of saturated salt solutions are indicated.

For graded solutions of potassium hydroxide and of sulphuric acid, data from the International Critical Tables or more recent sources are used as the basis of tables giving the concentrations (wt.%) and densities corresponding to relative humidities in steps of 5 per cent. R.H. Sources of similar data for calcium chloride, sodium hydroxide, sodium chloride, and glycerol solutions are given.

As an addition to the compilation of the available data on humidities in contact with various saturated salt solutions by O'Brien (1948), some more recent figures are quoted.

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D. S. Carr & B. L. Harris (1949). Solutions for maintaining constant relative humidity.—Industr. Engng Chem., 41, pp. 20142015.

E. M. Collins (1933). The partial pressures of water in equilibrium with aqueous solutions of sulfuric acid.—J. phys. Chem., 37, pp. 11911203.

D. S. Davis (1942). Vapour pressure nomographs for aqueous sodium hydroxide solutions.—Industr. Engng Chem., 34, pp. 11311132.

H. S. Harned & M. A. Cook (1939). The thermodynamics of aqueous sodium chloride solutions from 0 to 40° from electromotive force measurements.—J. Amer. chem. Soc., 61, pp. 495497. (Chem. Abstr., 33, 3663·5.)

C. G. Johnson (1940). The maintenance of high atmospheric humidities for entomological work with glycerol-water mixtures.—Ann. appl. Biol., 27, pp. 295299.

F. E. M. O'Brien (1948). The control of humidity by saturated salt solutions.—J. sci. Instrum., 25, pp. 7376.

Pickering (1894). Phil. Mag., 37, p. 359. (Int. crit. Tabl., 3, pp. 86, 110.)

H. F. Schoof (1941). The effects of various relative humidities on the life processes of the southern cow-pea weevil, Callosobruchus maculatus (Fabr.) at 30°C., ±0·8°.—Ecology, 22, pp. 297305.

R. Shankman & A. R. Gordon (1939). The vapour pressure of aqueous solutions of sulphuric acid.—J. Amer. chem. Soc, 61, pp. 23702373.

M. E. Solomon (1937). Experiments on the effects of temperature and humidity on the survival of Halotydeus destructor (Tucker), Acarina fam. Penthaleidae.—Aust. J. exp. Biol. med. Sci., 15, pp. 116.

M. E. Solomon (1945). The use of cobalt salts as indicators of humidity and moisture.—Ann. appl. Biol., 32, pp. 7585.

R. H. Stokes & R. A. Robinson (1949). Standard solutions for humidity control at 25°C.—Industr. Engng Chem., 41, p. 2013.

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Bulletin of Entomological Research
  • ISSN: 0007-4853
  • EISSN: 1475-2670
  • URL: /core/journals/bulletin-of-entomological-research
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