Environ. Sci. Technol. 1993, 27, 158-164
(2) The adsorption-partition model is developed to describe the sorption phenomenon on wastewater solids for single-component and multicomponent systems. The A-P model is tested using single-component experimental isotherm data for eight toxic organic compounds. (3) The A-P model is also verified by the binary sorption data. The model fits experimental data well. It was found that KO, could be used to assess the competition effect in a multicomponent system. The competition is negligible when KO, is larger than 1000. When KO, is smaller than 500, there is a significant competition effect. In dilute solutions, competition of multicomponent sorption can generally be ignored.
Literature Cited Petrasek, A. L.; Kugelman, I. J.; Austern, B. M.; Pressley, T. A.; Winslow, L. A.; Wise, R. H. J.-WaterPollut. Control Fed. 1983, 55, 1286. Hannah, S. A.; Austern, B. M.; Eralp, A. E.; Wise, R. H. J.-Water Pollut. Control Fed. 1986, 58, 27. Hannah, S. A.; Austern, B. M.; Eralp, A. E.; Dobbs, R. A. J.-Water Pollut. Control Fed. 1988, 60, 1281. Dobbs, R.; Jelus, M.; Cheng, K. Partitioning of Toxic Organic Compounds on Municipal Wastewater Treatment Plant Solids; EPA/600/D-86/ 137; NTIS PB68-218427; July 1986. Dobbs, R. A.; Wang, - L.; Govind, R. Environ. Sci. Technol. 1989, 23, 1092. Wang, L. Ph.D. Dissertation, University of Cincinnati, 1990. Wang, L.; Shan, Y.; Govind, R.; Dobbs, R. A. Abstracts of Papers, 201st National Meeting of the American Chemical
(17) (18)
(19) (20) (21)
(22)
Society, Atlanta, GA, April 1991; American Chemical Society: Washington, DC, 1991; ENVR 24. Sugiura, K.; Sato, S.; Goto, M. Chemosphere 1975,4, 189. Chiou, C. T. Environ. Sci. Technol. 1985, 19, 57. Chiou, C. T.; Peters, L. J.; Freed, V. H. Science 1979,206, 831. Schellenberg, K.; Leuenberg, Ch.; Schwarzenbach, R. P. Environ. Sci. Technol. 1984, 18, 652. Tsezos, M.; Bell, J. P. Water Res. 1989, 23, 561. Dobbs, R. A.; Cohen, J. M. Carbon Adsorption Isotherms for Toxic Organics; EPA-600/8-80-023; E P A Cincinnati, OH, 1980. Bell, J. P. Ph.D. Dissertation, McMaster University, Hamilton, ON, Canada, 1987. Bell, J. P.; Tsezos, M. Water Res. 1988, 22, 1245. Vieth, W. R.; Howell, J. M.; Hsieh, J. H. J . Membr. Sci. 1976, 1 , 177. Weber, W. J.; McGinley, P. M.; Katz, L. E. Environ. Sci. Technol. 1992,26, 1955. Mason, R. L.; Gunst, R. F.; Hess, J. L. Statistical Design and Analysis of Experiments; Wiley: New York, 1989. Karickhoff, S. W.; Brown, D. S.; Scott, T. A. Water Res. 1979, 13, 241. Chiou, C. T.; Porter, P. E.; Schmedding, D. W. Environ. Sci. Technol. 1983, 17, 227. Selvakumar, A,; Hsieh, H. N. J . Environ. Sci. Health 1988, A23, 729. Tsezos, M.; Seto, W. Water Res. 1986, 20, 851.
Received for review April 29,1992. Revised manuscript received September 2, 1992. Accepted September 17, 1992. This work was partially supported under the United States Environmental Protection Agency Cooperative Agreement CR 81293-010.
Release of Chlorocatechols from a Contaminated Sediment Mlkael Remberger, Per-Ake Hynnlng, and Alasdalr H. Nellson Swedish Environmental Research Institute, Box 21060, S-1 00 3 1 Stockholm, Sweden
rn The release of chlorocatechols from a naturally contaminated sediment has been examined. A true steady state was not reached even after 20 cycles with buffered deionized water, and the chlorocatechols were bound in varying degrees to particulate matter which could be removed from the extracts by centrifugation at lOOOOOg,or by dialysis: >70% of the trichlorocatechols and tetrachlorocatechol was contained in particulate material P0.2 and 0.2 and
