SPECIATION OF IRON AND ALUMINIUM IN DUMPSITE SOILS ASSOCIATED WITH FRUIT AND VEGETABLE WASTES IN YOLA, NIGERIA
DOI:
https://doi.org/10.33003/jaat.2025.1103.01Keywords:
Aluminium,, Dumpsite soils,, Fruit and vegetable wastes,, Iron,, Soil pollutionAbstract
The increasing amounts of solid waste, particularly from fruits and vegetables, present major environmental challenges in rapidly urbanizing areas. This study was carried out to determine the different forms of iron (Fe) and aluminium (Al) in fruit and vegetable dumpsite soils in Yola, Nigeria. Soil samples were collected from three depths and analyzed for sodium pyrophosphate, ammonium oxalate, and citrate dithionite bicarbonate (CDB) extractable iron and aluminium. Results obtained revealed that there were highly significant (P < 0.01) differences between the interaction of dumpsite soils and sampling depths. The highest sodium pyrophosphate (pyro), ammonium oxalate (oxa) and citrate bicarbonate dithionite (CBD) extractable Fe of 32.58, 24.40, and 29.02 mg kg-1 were recorded by fruit dumpsite soil at 0-15 cm, vegetable dumpsite soil at 0-15 cm, and vegetable dumpsite soil at 30-60 cm depth, respectively. Also, highest pyro, oxa and CBD Al of 261.60, 198.18, and 185.40 mg kg-1 were recorded by fruit dumpsite soil at 0-15 cm, vegetable dumpsite soil at 30-60 cm, and vegetable dumpsite soil at 0-15 cm depth. A highly significant (p<0.01) positive correlation (R = 0.83) was observed between pyro Fe and Al. Significant negative correlation (R = -0.90) was obtained between oxa-Fe and CBD-Fe. The higher levels of sodium pyrophosphate-extractable Al and Fe in fruit dumpsites suggest increased bioavailability and mobility constituting a potential for leaching into groundwater. This study provides baseline data on dumpsite soils in Yola but does not account for temporal dynamics or variations in other regions.
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