The biochemical response to different Cr and Cd concentrations in soils amended with organic wastes.

Manuel Tejada, Juan Parrado, Teresa Hernández, Carlos García

Index: J. Hazard. Mater. 185(1) , 204-11, (2011)

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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(NO(3))(3) and Cd(NO(3))(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.Copyright © 2010 Elsevier B.V. All rights reserved.