EFFECTS OF RED MUD AND GRAVEL SLUDGE ON THE MOBILITY AND PLANT UPTAKE OF TRACE METALS FROM A CONTAMINATED SOIL

AUTHOR: NGONADI, NKIRUKA JUDITH (MSc)

SCHOOL: School of Environmental Technology (SOET)

AFFILIATION: Federal University of Technology Owerri

An investigation was carried out to assess the role of organic minerals viz(Red Mud(RM),Gravel Sludge(GS)) in heavy metal mobility and uptake by plant species. Heavy Metal(HM) contaminated soil obtained from Nekede auto mechanic village was amended with organic minerals viz RM and GS to obtain three different combinations viz HM-soil +RM,HM-soil+GS and HM-soil+RM+GS. Soil without amendment served as control. The treatments were replicated three times and was laid out in a simple completely randomized design. Metal leachability experiment was conducted using nitrocellulose membrane filter and Amaranthusviridisseedlings was used to evaluate metal uptake. Results obtained showed that the amendment combination HM+RM+GS adsorbed Cd: 0.4mg/kg, Pb: 232.2mg/kg, Zn: 324.5mg/kg, Cu:113.6mg/kg. Also HM +GS had Cd:1.0mg/kg, Pb:456.8mg/kg, Zn:623.8mg/kg and Cu:213.5mg/kg and HM +RM had Cd: 1.2 mg/kg, Pb:578.6 mg/kg, Zn:543.7mg/kg, Cu:321.4 mg/kg as against the control of 21.5mg/kg, 982.8mg/kg, 1087.1mg/kg and 785.5mg/kg, respectively. Amaranthusviridismetal concentration grown on the mineral amendments gave HM + RM +GS Cd: 0.1 mg/kg, Pb: 98.3 mg/kg, Zn:112.7mg/kg, Cu:201.5 mg/kg, HM +GS :Cd:0.3 mg/kg, Pb: 213.6mgkg, Zn:233.9mg/kg, Cu:214.6mg/kg and HM +RM Cd: 0.6mg/kg,, Pb:224.3mg/kg Zn:214mg/kg, Cu:255.7 mg/kg as against control of 12.3mg/kg, 356.7mg/kg, 432.5mg/kg and 564.2mg/kg respectively. The amendment was effective in reducing metal mobility and was highly significant when the amendment were in combination.

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