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Abstract  

Eight soil profiles developed on crystalline basement complex rocks in the semi-arid region of Nigeria were analyzed for total contents of cesium (Cs), chromium (Cr), cobalt (Co), hafnium (Hf), iron (Fe), lanthanum (La), lutetium (Lu), scandium (Sc), thorium (Th), uranium (U) and ytterbium (Yb). The contents range from 50.3–95.4 Cs, 16.1–58.1 Cr, 0.6–9.0 Co, 9.0–34.8 g g–1 Hf, 0.31–3.69% Fe, 17.2–60.7 La, 60.4–90.6 Lu, 2.6–12.6 Sc, 8.3–21.5 Th, 4.7–9.2 U and 3.6–92 g g–1, Yb. Their corresponding means were 68.4, 35.1, 4.0, 19.9 g g–1, 1.70%, 37.1, 79.4, 6.5, 14.7, 6.7 and 5.0 g g–1. In general, total Cs, Co, Fe, La, U and Yb increased with further increase with depth. On the other hand, Lu, Sc and Th showed no distinct vertical distribution within the profiles. All eleven elements were correlated with the amounts of clay present in the soils, the correlation being stronger for Cs, Th, Yb, Cr and Lu.

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Abstract  

Twenty nine (29) major, minor and trace elements including rare earth elements (REEs) were determined by INAA in rock samples from Akwana and Arufu areas, Middle Benue Trough, Nigeria. The rock units are located within the lead-fluorite and baryte mineralisation there. The concentrations of the major elements in the tertiary basalt (TB) and dolerite are similar while the elemental abundance in the granite gnesses is completely different. The elemental concentrations in the rock samples do not show any known relationship with fluorite abundance. The concentrations of some elements in both tertiary basalt and dolerite show them to be derived from alkali basaltic liquid. The chondritic normalised REE distribution patterns for the TB are similar to those of BCR-1 but the chondritic relative REE abundance is more enriched in TB than in the BCR-1. The chondritic normalised REE distribution patterns for the granite gneisses are also compared to those of the standard granite samples.

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Abstract  

Nigerian and Kenyan clays were analysed using energy dispersive X-ray fluorescence (EDXRF) technique and thirteen elements (Ca, Ti, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, Zr, Nb and Pb) were detected. The health implications, since the substance is mostly consumed by pregnant women in both countries, are also reviewed and discussed.

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Abstract  

Twenty four elements: Fe, Al, Ca, Mg, K, Na, Sc, Sr, Co, Cr, Zn, V, Hf, Ir, W, REE (La, Ce, Nd, Sm, Eu, Tb, Yb, Lu) and Th were determined in limestone and associated calcite from Abakaliki, South-Eastern Nigeria, by instrumental neutron activation analysis (INAA) technique. The USSG reference materials BCR-1 and AGV-1 were included in the analysis to assure quality control of the accumulated data. Hitherto, there is very little work of this type on the deposits in the region being studied. This study, therefore, provides baseline data for the deposit.

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Abstract  

Instrumental neutron activation analysis was utilized for the multielemental determination of elements in the roots of Ageratum conyzoides, a tropical medicinal plant that is used locally for the cure of various diseases in Nigeria. The concentrations of Al, Ba, Br, Ca, Co, Cr, Fe, K, Mg, Mn, Na, Rb, Sc, Sr, V and Zn were analyzed with the 250 kW Triga Reactor at the Atominstitut, Vienna. The essential elements K, Na, Ca, Fe, Mg, Mn and Zn and the non-essential elements Al, Ba, Sr and Rb are present in significant concentrations. Other elements including Co, Cr, Sc and V are present at trace levels. The likely implication of these elements in restoring and maintaining good health is discussed. Quality control on the measurements was carried out by analyzing standard reference materials alongside the samples.

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