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Abstract
This study investigates the contents of some heavy metals (Cadmium (Cd) and Chromium (Cr)) concentrations in the soils of a dumpsite located within Egor Local Government Area in Benin City. Soil samples were randomly obtained from different locations within the dumpsite while the control soils were obtained from the Faculty of Agriculture University of Benin. A total of 18 samples were collected, with nine from the dumpsite and nine from the
control site at three different depths (0-15cm, 15-30cm, and 30-45cm). The experiment was thereafter laid out in a Completely Randomized Design (CRD). Results from the investigations shows that the dumpsite soils exhibited higher organic matter content (47.73, 38.00 and 31.03 gkg -1) that ranged from the topsoil to the subsoil while the control had 13.79, 10.57 and 10.51 gkg -1 respectively. The dumpsite also recorded reduced (5.04 – 6.13) acidity, which resulted in increased nutrient (N, P, K, Ca and Mg) release so was the cadmium (Cd) concentrations significantly elevated in the dumpsite soils, ranging from 5.14 - 8.18 mgkg -1 , compared with the content in the control (0.31 - 0.66 mgkg -1 .). The Cd (19.93 – 36.78 mgkg -1) and Cr (5.14 – 8.18 mgkg -1) contents in the dumpsite were highly above the permissible limit defined by World Health Organization. These findings underscore the potential impact of waste deposition, emphasizing the need for proper waste management practices to mitigate heavy metal contamination from getting into the food chain and as such it is recommended that the dumpsite investigated should not be used in the production of food crops intended for human consumption.
control site at three different depths (0-15cm, 15-30cm, and 30-45cm). The experiment was thereafter laid out in a Completely Randomized Design (CRD). Results from the investigations shows that the dumpsite soils exhibited higher organic matter content (47.73, 38.00 and 31.03 gkg -1) that ranged from the topsoil to the subsoil while the control had 13.79, 10.57 and 10.51 gkg -1 respectively. The dumpsite also recorded reduced (5.04 – 6.13) acidity, which resulted in increased nutrient (N, P, K, Ca and Mg) release so was the cadmium (Cd) concentrations significantly elevated in the dumpsite soils, ranging from 5.14 - 8.18 mgkg -1 , compared with the content in the control (0.31 - 0.66 mgkg -1 .). The Cd (19.93 – 36.78 mgkg -1) and Cr (5.14 – 8.18 mgkg -1) contents in the dumpsite were highly above the permissible limit defined by World Health Organization. These findings underscore the potential impact of waste deposition, emphasizing the need for proper waste management practices to mitigate heavy metal contamination from getting into the food chain and as such it is recommended that the dumpsite investigated should not be used in the production of food crops intended for human consumption.
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