Abstract
The effects of heavy metals pollution on agricultural produce can not be over emphasize. To estimate the effect of heavy metal on pH and Cation Exchange Capacities of soil on incubation, relationships between availability of metals in soil after contamination were investigated for a range of soils and metals. Three concentrations (0 mg/kg, 2 mg/kg and 5 mg/kg) of lead and cadmium were added as nitrate solution as single and combine treatments to six soil samples under different plant canopy. The soils-metal were incubated at field capacity for 8 weeks under 250C. The exchangeable bases in soils were determined in IM ammonium acetate (pH 7.0) extract by FAAS and pH by pH meter with a combination electrode. The treatment is arranged in randomised complete design each in triplicates. The pH decreased from 7.02 to 6.70 and 6.63. Cation Exchange Capacities decreased from range of of 6.62 to range of 4.71 and 3.10 C mol kg-1 under single and combined treatments respectively for the six locations. These results enable us to understand natural attenuation of metal contamination and also to assess the risk of soil contamination by determining effects of metals reactions with CEC and pH in 8-weeks incubated soils after artificial contamination.Keywords: heavy metals, Incubation process, pH and CEC
Highlights
Soil contamination with heavy metals has been a big issue worldwide (Alloway 1995; Nriagu 1996)
It is very important to investigate the process of soil contamination itself with special attention to available fractions because it directly relates to the management and prevention of soil contamination
Heavy metals mobility is closely related to metal solubility, which is further regulated by adsorption, precipitation and ion exchange reactions in soils
Summary
Soil contamination with heavy metals has been a big issue worldwide (Alloway 1995; Nriagu 1996). It is very important to investigate the process of soil contamination itself with special attention to available fractions because it directly relates to the management and prevention of soil contamination. Such predictions under field conditions suffer from much uncertainty. Changes in soil solution chemistry, such as pH, redox potential and ionic strength, may significantly shift the retention processes of heavy metals by soils (Gerringa et al, 2001) These effects may be further complicated by ligand competition from other cations (Amrhein et al, 1994; Norrstrom and Jacks, 1998). A better understanding of the the effect of incubation period of heavy metals reaction with the soil properties like pH and CEC seem to be an important issue of present day research on risk assessments
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Applied Sciences and Environmental Management
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
