It has been known for many years that the impregnation of activated carbon with strategically selected compounds can help in its ability to remove toxic gases. Carbon can be impregnated by stirring it in an aqueous solution of the desired compound. Typically, an impregnant loading of 0.1-20 percent by weight is required. While there is an abundance of literature available on the adsorption of activated carbons with dilute solutions (typically in the range of 0.1 mM), generally with an eye toward the nitration of metals such as copper and zinc from water 1-5, we have found little discussion of adsorption isotherms at the high concentrations needed for impregnation 6. High concentration isotherms for a number of salts were obtained in the present study.
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