Heavy metal concentrations in soil from abandoned mining area in Barangay Baluno, Zamboanga City, Philippines

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Research Paper 10/06/2023
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Heavy metal concentrations in soil from abandoned mining area in Barangay Baluno, Zamboanga City, Philippines

Minsarib L. Kalnasa, Alma N. Abug
J. Bio. Env. Sci.22( 6), 80-87, June 2023.
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The study aimed to determine the extent of heavy metal contamination of Copper (Cu) and Lead (Pb) in the soil from the abandoned mining area in Zamboanga City, Philippines using the 2017 EMB Site Characterization Guidelines. Soil samples were randomly collected from 3 meridional blocks at 2 different soil depths, 0-5cm and 20-25cm. Pb and Cu concentrations, organic matter (OM) percentages, pH and Electrical Conductivity (EC) were analyzed using appropriate equipment across sampling sites. The study revealed that heavy metal content in Block 3 exceeded the maximum allowable concentrations based on WHO standard with an average mean of 3,351.00mgkg-1 Pb and 498.67mgkg-1 Cu at 20-25cm soil depth. Moreover, at 0-5cm soil depth, Block 3 had 4176.33mgkg-1 Pb and 494.67mgkg-1 Cu. Furthermore, soil pH was strongly acidic across all blocks with values of pH 5.0 at Block 1; pH 4.7 at Block 2 and pH 4.1 at Block 3. For EC and OM percentages, results ranged from 183.33 μS/cm to 286.67 μS/cm and 1.81% to 4.05%, respectively. Using Analysis of Variance at P < 0.05, this study further revealed that there is a significant difference of Pb and Cu concentrations in 3 meridional blocks at 0.001. This indicates that heavy metal concentrations present in the soil varies in the 3 blocks. However, in physico-chemical parameters, only organic matter has significant difference in all blocks at P ≤0.01. Based from the findings, it is recommended that counter measures be undertaken to minimize further retrogressive impacts of mine tailings left in the area specifically in Block 3.


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