Comparative Study of Levels of Trace Metals in Moss Species in Some Cities of the Niger Delta Region of Nigeria.
Ekpo, B.O.; Uno, U. A.; Adie, A.P.; Ibok, U.J.

Abstract
Moss was sampled from moss species at sites at Calabar, Eket, Aba and Port Harcourt. Analysis of samples showed presence of Pb, Hg, Cr, Ni, V, Cu, Cd, Mn, Fe, Zn and As at the time of sampling. Levels of the trace metals were determined. Results showed their levels varied from element to element and from location to location. Level of Fe was the highest in all the locations followed by Zn and Pb. However levels of pollutants were within FEPA(1991) and WHO(2001) threshold limiting values. Levels of trace metals in the moss samples were higher during the wet season than in dry season probably because mosses thrive better in moist, humid and wet environment. A paired t-test analysis at p0-05 (df 4,n =6)confirmed that seasonal variation was significant. Results provide regional baseline information for pollution monitoring .Study recommends use of moss as an effective pollution bio-monitors in the region.

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