Preliminary Geochemical Assessment of Asa River Sediments, North Central Nigeria

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Faculty of Science, Adamawa State University, Nigeria


Preliminary geochemical assessment of Asa river sediments has been carried out with the aim of evaluating the concentrations, extent of contamination and possible sources of metals in the sediments using XRF and ICP-MS techniques. Geochemical results of major oxides show that SiO2 has the highest value (range=72.4 to 94.1%; average=85.66%), others ranged from 0.01% in Cr2O3 , P2O5 and MnO 2 to 11.6 % in Al2O3. Enrichment of the major oxides according to UCC, PAAS and NASC shows that only SiO 2 is highly enriched in the sediments (1.3, 1.36 and 1.32 respectively) while others have values less than 1 (that is they are depleted in the sediments). Weathering indication parameters indicate some degree of intensive weathering. Ba, Sr and Zr have the highest average concentrations (1043, 138 and 1155ppm respectively) above other trace elements. Ba, Hf and Zr are highly enriched in the sediments (2.09; 1.9), (15.13; 4.7), (7.22;6.08) according to ASC and UCC average values respectively, while the rest are depleted with values <1. Ce has the highest average value of 29.08ppm above other rare earth elements. Ce may be sourced from glauconites. Tm has the lowest average value (0.18ppm). Rare earth elements show enrichment values <1, meaning that they are depleted in the sediments. Metals/elements ranged from low contamination factor to very high contamination factor, low degree of contamination to very high degree of contamination and the geo-accumulation index ranged from practically no contamination to moderately contaminated. Contamination Factors revealed the influence of both anthropogenic and geogenic on the metal concentrations in the sediments.



Geochemistry, Asa River Sediments, Enrichment, Contamination Factor, Weathering Indications