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This study investigated the speciation of heavy metals (Cd, Cu, Pb, Mn, Co, Ni, and Zn) in agricultural farmland soils in Abraka, Delta State, Southern, Nigeria. Soil's physicochemical parameters were also determined with the following results. pH ranged from 4.20-5.45(acidic soil), total organic carbon from 0.95-2.02%. Particle size showed soil to be mainly sandy, percentage nitrogen from 0.18-0.35 while phosphorus from 21.11-58.33mg/Kg, Cation Exchange Capacity ranged from 1.04-7.96Cmol/Kg. The percentage of the studied heavy metals in the various fraction are in the following order; Cd: Residual >acid soluble > oxidizable > reducible >exchangeable. Cu: Reducible > acid soluble > residual > oxidizable > exchangeable. Pb: Residual > reducible > acid soluble > oxidizable > exchangeable. Mn: Residual > Exchangeable > acid soluble > reducible > oxidizable. Co: Acid soluble > reducible > residual > oxidizable > exchangeable. Ni: Reducible > oxidizable > acid soluble > exchangeable > residual. Zn: Acid soluble >oxidizable > residual > reducible > exchangeable. Exchangeable Cd, Co, and Pb were not detected. The absence of mobile form of Cd, Co and Pb in all the soil samples eliminates the toxic risk both to the tropic chain and from its migration downwards the soil profile. The heavy metals speciation of the soil samples indicates that the heavy metals were predominately in the non-residual fractions suggestive of control by anthropogenic sources. The mean total extracted metals are Cd: 1.09-1.28, Cu: 8.82-11.46, Pb: 1.51-1.69, Mn: 58.29-64.86, Co, 0.88-1.32, Ni: 6.45- 7.97, Zn: 15.78-17.43mg/Kg.

Heavy Metal Determination by Sequential Extraction in Agricultural Farmland Soils In Selected Farms In Abraka, Delta State, Nigeria