Heavy metal contamination of surface soil in relationship to land use patterns: a case study of Benue State, Nigeria

Type Journal Article - Materials Sciences and Applications
Title Heavy metal contamination of surface soil in relationship to land use patterns: a case study of Benue State, Nigeria
Author(s)
Volume 1
Issue 03
Publication (Day/Month/Year) 2010
Page numbers 127-134
URL http://file.scirp.org/Html/2412.html
Abstract
A detailed investigation was conducted on the relationship between land use patterns and trace metal content in surface soils of the Benue State to assess soil environmental quality. Results revealed that metals levels were generally high in mineralized and urban soils and lower in agricultural soils whilst forest soils were lease by anthropogenic pollution. Mineralized soils developed from weathered sulphides were rich in lead (Pb), zinc (Zn), and cadmium (Cd). Urban soils accumulated copper (Cu), Zn, and Cd most probably from refuse dumps, gasoline combustion and farming. Agricul-tural soils were enriched in arsenic (As) and to a lesser degree Pb and Cd originating most probably from the applica-tion of pesticides, manure and fertilizers. A pollution index (PI) based on plant-tolerant contamination levels, indicates that multi-element contamination in soils is low and implies that the sampled soils could be cultivated for crop produc-tion especially away from point sources of pollution. The degree of anthropogenic pollution was high for As (80%), and Pb (54%), moderate for Zn (47%), Cd (40%) , and low for Cu (27%). Correlations (r) are significant between Zn- Pb (0.7), Cu-As (0.6) in mineralized soils, between Zn-Cu (0.64), Zn-Cd (0.5), Cu-Cd (0.6), in urban soils, As-Cd (0.61), in agricultural soils and Zn-Pb (0.82) in forest soils. These distinct relationships indicate a common source or similar geochemical control. Based on the overall evaluation, recommendation in respect of contamination, control and moni-toring strategies as well as land use planning in the study area are presented.

Related studies

»