Abstract
AbstractIn the presence of moisture and oxygen, thiocyanates at high concentration undergo a photocatalysed degradation to give a bright-yellow product. For Harrow sunlight there is a critical concentration near 1.5M, below which solutions of ammonium thiocyanate do not discolour. The same value is obtained for spots of ammonium thiocyanate on filter paper if the salt is assumed to be dispersed uniformly through the body of the cellulose fibre. A similar yellow product can be produced away from sunlight by the addition of hydrogen peroxide.Ammonium thiocyanate was totally lost from glass-fibre paper in three days in a vacuum desiccator, while under free exposure to room air most was lost from ordinary filter paper in seven weeks.4-M solutions of ammonium and potassium thiocyanate undergo photo-degradation if the pH is allowed to fall below a critical value near 3.7. Plain thiocyanate solutions are totally unbuffered, and the pH falls spontaneously when they are exposed to light and air. The use of succini...
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