Comparative effect of Organic Amendments on Heavy Metals Adsorption in Soils and their Chemical properties

Abstract

Incubation experiment was carried out to evaluate and compare effects of some selected amendments on adsorption of heavy metals in soils and their chemical properties. The experiment was CRD consisting of twelve treatment combinations with three replications. Soil samples were collected from the vicinity of Michael Okpara University of Agriculture and amended with organic amendments at the rate 20 ton/ha and heavy metals at the rate of 60 mg/kg, thoroughly mixed and wetted daily throughout the incubation period of 30 days. 0.05M EDTA solution was used to extract heavy metals. EDTA solution was filtered from soil with Whatman No1 filter paper. The soil was analyzed for chemical properties before and after experiment using standard procedures. Higher amount of heavy metals was extracted from the control soils than the amended soils indicating retention of heavy metals by the amendments. All the amendments were significantly (P<0.05) different in adsorption of copper with poultry manure having significantly (P<0.05) the highest adsorption capacity while the control had the least. Cocoa pod was significantly (P<0.05) higher on adsorption of lead with cow dung and poultry manure not being significantly (P>0.05) different from each other. Cow dung had the highest (P<0.05) on adsorption of zinc. Heavy metals combined with amendments had significant (P<0.05) effect on soil chemical properties. Most chemical properties were significantly (P<0.05) higher in soils treated with both amendments and heavy metals than soils treated with only heavy metals. Poultry manure, cocoa pod and cow dung appeared to have greater potential in removing heavy metals from soils.

Properties of soils of different lithology in the humid tropics of southeastern nigeria

“…Low level of organic carbon may be due to rapid organic matter weathering in the tropics, bush burning in the area and intensive utilization of the soils for agricultural crop production with short fallowing period for soil recuperation and regeneration of botanical biodiversity. These soils will be low in CEC due to their low organic content as Nwachukwu et al (2021) defined soil organic matter as a complex and heterogeneous mixture of organic substances that provide much of the CEC and water holding capacity of soils. Different observation was also made on organic carbon by Akpan-Idiok et al (2016) who reported moderate values of organic carbon for similar soils in Cross River State.…”

Effect of Drought Stress, Soil Salinity, P. indica, and MWCNs on Biodegradation of Diesel Oil in the Pb- and Cd-Polluted Soil Under Cultivation of Triticale Plant

“…It has also been reported that using organic amendments, such as cow manure or sewage sludge in heavy metalspolluted soils, may increase the soil sorption properties and thereby decrease the heavy metal availability [19,20]. However, the long-term decomposition of these compounds can redistribute heavy metals in the soil, which can be a negative aspect [21,22]. Accordingly, using organic amendments, such as Multi-Walled Carbon Nanotubes (MWCNs), can increase the soil sorption properties without changing soil components.…”