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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.63  Durban  2010




Degradation of endosulfan I and endosulfan II in the aquatic environment: A proposed enzymatic kinetic model that takes into account adsorption/desorption of the pesticide by colloidal and/or sediment particles



Mark F. Zaranyika*; Mussie Jovanni; Judith Jiri

Department of Chemistry, University of Zimbabwe, P.O. Box MP167, Mount Pleasant, Harare, Zimbabwe




The rate of degradation of the a and β isomers of endosulfan, endosulfan I and endosulfan II in distilled water and river water containing river sediment, were investigated over a period of 90 days. An immediate loss of 18 % endosulfan I and 22 % endosulfan II from the water phase of the river water containing river sediment was observed as a result of adsorption by the sediment. Subsequently biphasic linear rates of degradation were observed for both endosulfan I and II in the water phase, as well as the sediment phase of the experiment. Minimal degradation was observed in the distilled water control. An enzymatic kinetic model is presented showing that the biphasic linear rates are consistent with microbial degradation of free and colloidal particle-adsorbed pesticide in the water phase, and colloidal particle- and sediment particle-adsorbed pesticide in the sediment phase of the experiment. The estimation of the biphasic rates of degradation of the pesticide in the water and sediment phases of the system, and the factors affecting the rates of degradation, are discussed.

Keywords: Endosulfan, degradation kinetics, aquatic environment, pesticide, adsorption/desorption kinetics



Full text available only in PDF format.



This work was supported by a grant from the Research Board of the University of Zimbabwe.



1 W.C. Batiste, J. Econ. Entomol, 1970, 63, 1339-1341.         [ Links ]

2 A.A. Mhlanga and J.J. Madziva, Ambio, 1990, 19, 368-372.         [ Links ]

3 H.M. Shivaramaiah, F. Sanches-Bayo, J. Al-Rifai and I.R. Kennedy, J. Environ. Sci. Health, 2005, B40, 711-720.         [ Links ]

4 N.G. Chapman, Trans. Rhod. Sci. Assoc., 1976, 57, 12-21.         [ Links ]

5 K.S. Hocking, C.W. Lee, J.S. Beesley and H.T. Matechi, Aust. Bull. Entomol. Res., 1966, 56, 737-744.         [ Links ]

6 U.S. Environmental Protection Agency, in Analytical Reference Standards and Supplemental Data: the Pesticides and Industrial Chemicals Repository, US EPA, Las Vegas, NV, USA, 1984.         [ Links ]

7 W.W. Johnson and M.T. Finley, Handbook of Acute Toxicity of Chemicals to Fish and Aquatic Invertebrates, Resource Publication 137, U.S. Department of Interior, Fish and Wildlife Service, Washington, DC, USA, 1980, pp. 6-36.         [ Links ]

8 M.T. Wan, J.N. Kuo, C. Buday, C. Schreder, G. Van Aggelen and J. Pasternak, Environ. Toxicol. Chem., 2005, 24, 1146-1154.         [ Links ]

9 A.G. Smith, Chlorinated Hydrocarbon Insecticides, in Handbook of Pesticide Toxicology (WJ. Hayes, Jr. and E. R. Laws, Jr., Eds.) Academic Press Inc., New York, NY, USA, 1991, 245-274.         [ Links ]

10 U.S. Agency for Toxic Substances and Disease Registry, Toxicological Profile for Endosulfan, Draft Report, Atlanta, GA, USA, 1990.         [ Links ]

11 National Cancer Institute, Bioassay of Endosulfan for Possible Carcinoge-nicity, Technical Report Series No. 62. National Institutes of Health, Bethesda, MD, USA, 1978, pp. 1-88.         [ Links ]

12 R.G. Burns, Bull. Environ. Contam. Toxicol., 1971, 6, 316-322.         [ Links ]

13 T.S. Kathpal, P.R.Yadav and K.S. Kushwaha, Indian J. Entomol., 1981, 43-44, 420^27.         [ Links ]

14 R. Martens, Bull. Environ. Contam.Toxicol., 1977, 17, 438-446.         [ Links ]

15 M.F. Zaranyika and P. Mugari, Persistence in soil of endosulfan and lindane applied to soybean and maize pests in a field trial agrosystem in Zimbabwe, in Environmental Behavior of Crop Protection Chemicals, Proceedings of the FAO/IAEA International Symposium on the Use of Nuclear and Related Techniques for Studying Environmental Behavior of Crop Chemicals, International Atomic Energy Agency (IAEA), Vienna, Austria, 1997, pp. 151-162.         [ Links ]

16 P. Parkpian, P. Anurakpongsatorn, P. Pakkong and W.H. Patrick, Jr., J. Environ. Sci. Health, 1998, B33, 211-233.         [ Links ]

17 M.D. Rao and A.M. Satyanarayana, J. Agric. Food Chem., 1980, 28, 1099-1101.         [ Links ]

18 I.O.D. El Biet, J.V Wheellock and D.E. Cotton, Int. J. Environ. Stud., 1981, 16, 171-196.         [ Links ]

19 R.D. Wauchope, T.M. Buttler, A.G. Hornsby, P.W.M. Augustijn Beckers and J. P. Burt, Rev. Environ. Contam.Toxicol., 1992, 123, 1-155.         [ Links ]

20 K. Knowvenagel and R. Himmetreich, Arch. Environ. Contam.Toxicol., 1976, 4, 324-333.         [ Links ]

21 J.R.W. Miles and P. Moy, Bull. Environ. Contam. Toxicol., 1978, 23, 13-19.         [ Links ]

22 P.H. Howard, ed., Handbook of Environmental Fate and Exposure Data for Organic Chemical Pesticides, Lewis Publishers, Chelsea, MI, USA, 1989, pp. 6-13.         [ Links ]

23 P.A. Greve and S.L Wit, Water Pollut. Control Fed., 1971, 42, 2338-2348.         [ Links ]

24 G. Nettes and N. Andrew, Pesticide Sci., 1985, 15, 273-275.         [ Links ]

25 M.F. Zaranyika, E. Mambo and J.M. Makhubalo, Sci. Total Environ., 1994, 142, 221-226.         [ Links ]

26 M.F. Zaranyika and M.G. Nyandoro, J. Agric. Food Chem., 1993, 41, 836-842.         [ Links ]



Received 7 March 2009
Revised 30 September 2010
Accepted 22 November 2010



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