ADSORBENT COMPOSITION WITH REACTIVE INDICATOR

摘要

A composition and method of determining the remaining service life in an impregnated adsorbent composition. Composition is an indicating absorbent composition that contains both an impregnated adsorbent component and a reactive indicator. The indicating absorbent composition is used for air purification in the same manner that any impregnated adsorbent filtration medium is used, except that it contains an internal means for determining its remaining service life. The reactive indicator is designed to undergo a color change or loss of color intensity upon contact with noxious or hazardous contaminants, wherein the indicating absorbent composition removes contaminants from a contaminated air stream, thereby affording an optical means of determining the indicating absorbent composition remaining service life. In one embodiment, the color change is in the visible spectrum, such that a simple colorimetric comparison of the reactive indicator and a standardized or calibrated color chart is used to ascertain the remaining service life of the indicating absorbent composition.