Open AccessHeavy Metals Distribution and Speciation in Soils around a Mega Cement Factory in North-Central Nigeria
Author(s) -
F. A. Adekola,
AA Inyinbor,
A.A. Raheem
Publication year - 2012
Publication title -
ethiopian journal of environmental studies and management
Language(s) - English
Resource type - Journals
ISSN - 1998-0507
DOI - 10.4314/ejesm.v5i1.2
Subject(s) - environmental chemistry , soil water , manganese , pollution , zinc , copper , enrichment factor , atomic absorption spectroscopy , soil test , carbonate , contamination , soil contamination , organic matter , metal , chemistry , cement , metallurgy , mineralogy , environmental science , heavy metals , soil science , materials science , ecology , physics , organic chemistry , quantum mechanics , biology
Surface and sub-surface soils were sampled in the neighbourhood environment of an ultra-modern and\udlargest cement factory in Nigeria. The five geochemical fractions investigated were exchangeable,\udcarbonate, Fe-Mn oxide, organic matter and residual. All fractions were subsequently analyzed for lead\ud(Pb), copper (Cu), zinc (Zn), manganese (Mn) and iron (Fe) using atomic absorption spectrophotometer.\udThe average total metals concentrations (mg/Kg) in the surface soil were 1063.8± 261 for Fe, 30.29 ±\ud19.25 for Mn, 24.15 ± 21.69 for Cu, 15.08 ± 11.95 for Pb and 8.54 ± 3.18 for Zn. Relatively lower mean\udconcentrations were measured in the sub-surface soil samples. The percent distribution concentration of\udthe various metals in the residual fraction ranged from 0.23 to 69.48% for Pb, 0.85 to 75.30% for Cu,\ud36.02 to 83.86% for Zn, 12.97 to 44.04% for Mn and 18.11 to 57.25% for Fe. Factor analysis revealed that\udwhile Pb, Cu and Zn would majorly be of anthropogenic origin, Mn and Fe are mainly of natural origin. Pb\udwas found to be the most mobile with mobility factor of 71.8% while Fe has the least mobility factor of\ud3.62%. Regression analysis (r2 = 0.71) further showed that Cu is correlated with Pb. Soil pollution indices\udrevealed that the surface soil is slightly contaminated in lead and zinc, and moderately contaminated in\udcopper