Soil and plant composition in the Noun river catchment basin,Western Cameroon: a contribution to the development of a biogeochemical baseline |
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| Authors: | Clémentine Njofang Jörg Matschullat Akoa Amougou Jean Pierre Tchouankoué Hermann Heilmeier |
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| Institution: | 1.Interdisciplinary Environmental Research Center,Technische Universit?t Bergakademie Freiberg,Freiberg,Germany;2.Faculty of Science,Université de Yaoundé 1,Yaoundé,Cameroon |
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| Abstract: | Soils and selected edible plants of the Noun river catchment basin of western Cameroon were sampled to investigate the distribution
of trace elements, based on the preliminary idea of unusual anomalies. Analytical techniques for trace elements included ICP-AES,
GF-AAS, and ICP-MS. Further soil analyses comprised the mineralogy and contents of the biogenic elements carbon, nitrogen
and sulphur (CNS). The trace element concentrations in the soils reflect those of the lithogeochemical background of the pluto-volcanic
rocks of the region. This is consistent with the results from the mineralogical analyses and physicochemical parameters such
as pH, taken in the field, which also do not suggest any geochemical anomaly. Most trace elements analyzed in the plants showed
concentrations that reflect those of the soils (Al, Fe, Ti, and Rb). However, some trace elements were enriched in the plants
as compared to the soils, such as Zn, Cu, Cd, Mo (excluding yam), Ni (peanut), Ba (peanut), Sr (peanut, bean), and B. Trace
elements such as As, Cr, V, and Se were not bioavailable for all the analyzed plants. Besides, trace elements such as Cu,
Zn, Mo, Fe, Al, Ni, B, Ti, Rb, Cs, and Ba were in the range of phytotoxicity and reached or exceeded human food tolerance
level (Cu). The plants with seeds showed a higher absorption of trace elements compared to plants with tubercles. |
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| Keywords: | Trace elements Noun river catchment basin of Western Cameroon Soil geochemical baseline Soil-plant transfer |
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