FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Chemical, concentrations, enrichment, geo-accumulation, heavy metal, pollution
Soils around a cement factory in Sagamu, South West Nigeria were analyzed for their physicochemical (pH, texture, exchangeable cations and organic matter) parameters and elemental contents to assess the contamination level of the soils. Samples were collected at twenty-two identified transects of the soils near the cement factory using standard analytical procedures during dry and rain seasons. Elemental contents of the soils were determined using the bulk scientific Atomic Absorption Spectroscopy (AAS) technique while the physicochemical parameters were determined using standard analytical techniques. In addition, calculation of Enrichment Factors (EFs), Geoaccumulation Index (Igeo), Pollution Indices (PI) and Pearson correlation matrices were performed on the elemental concentration data. Results indicated that the physicochemical parameter values varied across the transects as well as in the seasons. Average soil pH ranged from 5.8 to 7.2 (dry season) and 4.6 to 6.8 (rain season) while organic matter contents were from 9.4 to 39.6 g/kg (dry) and 12.8 to 30.9 g/kg (rain). Soil texture of the transects was dominated by sandy structure with an average of 68 % (dry) and 57 % (rain). Ten elements (Ca, Pb, Zn, Mg, Fe, Cu, Co, As, Ni and Cr) were analyzed and their concentrations values established. Average total elemental concentrations were in the order of 2332 µg g-1 (0.3 km) > 1870 µg g-1 (0.3 km to 1 km) > 1048 µg g-1 (1 km to 5 km) > 671 µg g-1 (5 km to 10 km) > 322 µg g-1 (10 km to 20 km) > 406 µg g-1 (20km) and 509 µg g-1 (0.3 km to 1 km) > 596 µg g-1 (1 km to 5 km) > 319 µg g-1 (5 km to 10 km) > 460 µg g-1 (10 km to 20 km) > 119 µg g-1 (≥20 km) for dry and rain seasons respectively. The elements were majorly in the low EFs class while Igeo, PIs and Pearson correlation results revealed that some elements were in the highly pollution class and strongly correlated. The study concluded that anthropogenic emissions from the cement factory posed great hazard to nearby agricultural soils.
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