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Note 1: Experimental Conditions: C0 = 10 ^moles per liter, 0.273 mm. Columbia carbon, 25°C

Note 2: Symbols relate to Langmuir isotherm: x = ^ ™ ^

(Reprinted with permission, from I.C. MacRae, K. Raghu, and E.M. Bautista, 1969, Nature 221:859.

Note 1: Experimental Conditions: C0 = 10 ^moles per liter, 0.273 mm. Columbia carbon, 25°C

Note 2: Symbols relate to Langmuir isotherm: x = ^ ™ ^

(Reprinted with permission, from I.C. MacRae, K. Raghu, and E.M. Bautista, 1969, Nature 221:859.

are required for all but parathion to attain saturation capacity.

Additional studies (Dedrick and Beckman 1967) indicate that adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) can be correlated by both the Freundlich and the Langmuir isotherms; however, two sets of correlating constants are required for each of the low and high concentration ranges. No significant differences in carbon capacities were noted between granular and powdered carbon. Carbon loadings of approximately 60% by weight of the herbicide were attained at liquid concentrations 95% of saturation, or about 740 mg/l.

Carbon adsorption studies using a slurry approach showed parathion to be most amenable and lindane least amenable (Table 8.2.6) to removal by activated carbon. Use of a granular bed at 0.5 gpm/cu ft resulted in almost complete removal of all pesticides.

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