Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 62, Issue 1, Pages 39-48Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0265-931X(01)00149-7
Keywords
natural radioactivity; heavy metals; phosphate rocks; environmental hazard
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Phosphate rock samples collected from the Dange Formation within the Sokoto basin were analyzed for trace element constituents using instrumental neutron activation analysis (INAA) and X-ray fluorescence analysis (XRFA) techniques, while natural activity concentrations due to U-238, Th-232, and K-40 were determined by gamma-ray spectrometry. The analytical results show that the average concentrations of some toxic elements (As, Sb, Cr, and Zn) in phosphate rocks are not appreciably different from that in agricultural soils. However the U and Th contents are enriched significantly in comparison. The results were used to assess the environmental toxicity of heavy metals and radiation hazard attributable to the direct application of phosphate rock as fertilizer. (C) 2002 Elsevier Science Ltd. All rights reserved.
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