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Adsorption of organic compounds from dilute aqueous solutions onto the external surface of type A zeolite.

Type A zeolite, an insoluble crystalline sodium aluminosilicate, has been developed as a water-hardness controlling agent for laundry detergent products. In order to assess the environmental safety of this material, we have examined the adsorption of organic compounds of varying polarity onto the external surfaces of calcium-exchanged type A zeolite in aqueous medium at pH 8. The compounds included p-chlorophenol, dieldrin, dodecylhexakis(oxyethy1ene) alcohol (ClzE6), and tetradecyltrimethylammonium chloride. In addition, adsorption onto the sodium form of the zeolite was studied with methylene blue (to characterize the zeolite) and with linear alkylbenzenesulfonate (LAS). Type A zeolite provides a relatively weak adsorptive surface for organics of all polarities studied when compared to adsorption of these compounds onto natural clay minerals and sewage sludge. The introduction of type A zeolite into environmental waters through its use in laundry detergents should therefore not alter the normal fate of organic molecules in the environment.