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Translocation and accumulation of trace metals in rice plants in Nsit Ubium, Akwa Ibom State of Nigeria
This study aimed at ascertaining the quality of locally produced rice which is consumed mostly by rural dwellers. The extent of soil pollution was measured using geoaccumulation index (I geo) as a pollution index, and enrichment coefficient (EC) of heavy metals (Pb, Fe, Zn, and Ni) and translocation potentials of hybrid rice plants – ITA, CISADANE, WITA 4, and MARS were investigated in a rice farm in Nsit Ubium, South-South Nigeria under actual field conditions. The results revealed that soils in the farmland are moderately polluted with Pb, Fe, and Ni (I geo < 2) and unpolluted to moderately polluted with Zn (I geo < 1) and that soil Pb, Zn, and Ni exceeded the European Commission limits and levels in uncontaminated soils. The levels of Pb in ITA grains and Zn in ITA and MARS grains exceeded the FAO/WHO safe limits. The roots and stems of all hybrids were accumulators (1 < EC < 10) of Fe, Zn, and Ni whereas the roots of ITA hybrid only accumulated Pb (EC = 1.06). The leaves and grains had little potential for metal extraction (EC < 1). The result further indicated that all hybrid rice plants translocate Pb, Fe, Zn, and Ni ineffectively from roots to stem (S/R), stem to leaves (L/S) and from stem to grains (G/S) (translocation factor < 1). The ITA hybrid rice in the study area appeared to be unsafe for consumption. The finding has emphasized the need for the identification of rice species that are not hyper-accumulators of toxic metals for planting in a particular ecology.
Translocation and accumulation of trace metals in rice plants in Nsit Ubium, Akwa Ibom State of Nigeria
This study aimed at ascertaining the quality of locally produced rice which is consumed mostly by rural dwellers. The extent of soil pollution was measured using geoaccumulation index (I geo) as a pollution index, and enrichment coefficient (EC) of heavy metals (Pb, Fe, Zn, and Ni) and translocation potentials of hybrid rice plants – ITA, CISADANE, WITA 4, and MARS were investigated in a rice farm in Nsit Ubium, South-South Nigeria under actual field conditions. The results revealed that soils in the farmland are moderately polluted with Pb, Fe, and Ni (I geo < 2) and unpolluted to moderately polluted with Zn (I geo < 1) and that soil Pb, Zn, and Ni exceeded the European Commission limits and levels in uncontaminated soils. The levels of Pb in ITA grains and Zn in ITA and MARS grains exceeded the FAO/WHO safe limits. The roots and stems of all hybrids were accumulators (1 < EC < 10) of Fe, Zn, and Ni whereas the roots of ITA hybrid only accumulated Pb (EC = 1.06). The leaves and grains had little potential for metal extraction (EC < 1). The result further indicated that all hybrid rice plants translocate Pb, Fe, Zn, and Ni ineffectively from roots to stem (S/R), stem to leaves (L/S) and from stem to grains (G/S) (translocation factor < 1). The ITA hybrid rice in the study area appeared to be unsafe for consumption. The finding has emphasized the need for the identification of rice species that are not hyper-accumulators of toxic metals for planting in a particular ecology.
Translocation and accumulation of trace metals in rice plants in Nsit Ubium, Akwa Ibom State of Nigeria
Udousoro, Imaobong Inyang (author) / Umoren, Ini (author) / Udoh, Anthony (author)
Geosystem Engineering ; 16 ; 129-138
2013-06-01
10 pages
Article (Journal)
Electronic Resource
English
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