The biochemical response to different Cr and Cd concentrations in soils amended with organic wastes |
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| Authors: | Manuel Tejada Juan Parrado Teresa Hernández Carlos García |
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| Affiliation: | 1. Departamento de Cristalografía, Mineralogía y Química Agrícola, E.U.I.T.A. Universidad de Sevilla, Crta de Utrera km. 1, 41013 Sevilla, Spain;2. Departamento de Bioquímica, Toxicología y M.L. Facultad de Farmacia, Universidad de Sevilla, C/Prof. García González 2, 41012 Sevilla, Spain;3. Departamento de Conservación de Suelos y Agua y Manejo de Residuos Orgánicos, Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, P.O. Box 4195, 30080 Murcia, Spain |
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| Abstract: | The effects of adding municipal solid waste (MSW) or poultry manure (PM) on the biochemical properties of a soil polluted with Cr and Cd were studied. Soil was mixed with Cr(NO3)3 and Cd(NO3)2 to give three concentrations (0, 100, and 250 mg Cr kg−1 and 0, 100, and 250 mg Cd kg−1) in the soil, which was then treated with MSW at a rate of 10% or PM at a rate of 7.6%. The pH and biochemical parameters were measured at 0 and 120 days. An unamended and no-polluted soil was used as control. Compared with the non-polluted soil, for the 250 mg Cd kg−1 treatment the microbial biomass-C, dehydrogenase, urease, β-glucosidase, phosphatase, and arylsulphatase activities decreases 23%, 26.2%, 36%, 34.8%, 18.4%, and 15.8%, respectively, whereas for 250 mg Cr kg−1 treatment the biochemical parameters were slightly lowest than for 250 mg Cd kg−1 treatment. For 250 mg Cr kg−1 soil + 250 mg Cd kg−1 soil treatment, the inhibition percentages of the biochemical parameters increased. After the application of organic wastes in Cr + Cd polluted soil, the inhibition of biochemical properties was greater with the MSW amendment than with PM, possibly due to its higher humic acid concentration. |
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| Keywords: | Cr + Cd pollution Organic wastes Soil enzymatic activities Organic wastes |
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