derichment

derichment

[dē′rich·mənt]
(analytical chemistry)
In gravimetric analysis by coprecipitation of salts, a system with λ less than unity, when λ is the logarithmic distribution coefficient expressed by the ratio of the logarithms of the ratios of the initial and final solution concentrations of the two salts.

derichment

A condition in the fuel-metering system in which the fuel-air mixture is leaned out, or deriched, when antidetonation injection fluid is injected into the engine. If this is not done, the mixture would be enriched by the antidetonation fluid, and the engine might not develop its maximum power.