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Acute and Chronic Toxicity of Selected Cadmium Salts on Earthworm Eisenia andrei under Tropical Conditions

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dc.contributor.author Jayathilake, T.A.H.D.G.
dc.contributor.author Mallawaarachchi, M.A.G.D.
dc.contributor.author De Silva, P.M.C.S.
dc.contributor.author Peiris, L.D.C.
dc.date.accessioned 2017-10-10T04:15:16Z
dc.date.available 2017-10-10T04:15:16Z
dc.date.issued 2016
dc.identifier.citation Jayathilake, T.A.H.D.G., Mallawaarachchi, M.A.G.D., De Silva, P.M.C.S., Peiris, L.D.C. (2016). "Acute and Chronic Toxicity of Selected Cadmium Salts on Earthworm Eisenia andrei under Tropical Conditions", International Forestry and Environment Symposium, University of Sri Jayewardenepura, 20 pp. en_US, si_LK
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/5736
dc.description.abstract Attached en_US, si_LK
dc.description.abstract Agrochemicals and other hazardous chemicals are well known threats to healthy soil ecosystems. Fertilizers containing cadmium as an impurity are being added extensively to agricultural soils in Sri Lanka. These impurities may have hazardous impacts on soil ecosystems. Therefore toxicity of Cadmium Chloride (CdCl2) and Cadmium Sulphate (CdSO4) on survival, growth and reproduction of the earthworm Eisenia andrei were investigated under tropical conditions. The standard earthworm toxicity tests were performed according to the guidelines developed by ISO (International Organization for Standardization) and OECD (Organization for Economic Co-Operation and Development). Field collected natural soils were used as the test substrates. The endpoints measured were survival, growth and reproduction together with behavioral effects. Coiling, secretion of mucus and hypersensitivity were noted as common behavioral effects, which was observed in the highest concentrations in both cadmium salts. In terms of survival, both cadmium salts were not toxic to earthworm Eisenia andrei as LC50 were >1000 mg a.i /Kg dry soil. However, the chronic toxicity of cadmium chloride and cadmium sulphate was extremely high. Biomass reduction and reproduction were severely affected even at lower concentrations. The EC50 value for cadmium chloride and cadmium sulphate was 5.5 (2.6-8.4) mg a.i /kg dry soil and 6.3 (1.4- 11.3) mg a.i /kg dry soil respectively. Lowest observed effect concentration (LOEC) for both salts was 1 mg a.i /Kg dry soil and No observed effect concentration (NOEC) was <1 mg a.i /Kg dry soil. Our study concludes that use of high Cd containing fertilizers may risk beneficial soil organisms and application should be done with caution.
dc.language.iso en_US en_US, si_LK
dc.publisher University of Sri Jayewardenepura en_US, si_LK
dc.subject Toxicity en_US, si_LK
dc.subject Earthworm en_US, si_LK
dc.subject Eisenia en_US, si_LK
dc.subject Cadmium en_US, si_LK
dc.title Acute and Chronic Toxicity of Selected Cadmium Salts on Earthworm Eisenia andrei under Tropical Conditions en_US, si_LK
dc.type Article en_US, si_LK


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