Abstract
Crystalline chlorophyll a in benzene solution remains almost unlatered for several hours; however, when spread as a monolayer, at zero film pressure, at a water-air interface it decomposes rather rapidly. This decomposition is decreased by increasing film pressure and by some additives in the water phase. The chemical changes are mainly attributed to a sufficiently high concentration of hydrogen ions in the water phase. Protective measures are high film pressure or a pH of 8 when films at low film pressure have to be maintained stable. Protection is also achieved i n a close system using an inert gas, free of carbon dioxide.
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