TEMPORAL VARIABILITY OF HEAVY METAL CONTENT IN THE ATMOSPHERE OF KETU- MILE 12 AREA OF LAGOS - STATE, SOUTHWESTERN - NIGERIA USING MOSS PLANT POLYTRICHUM JUNIPERUM AS BIOINDICATOR

C.C. Ojiodu, E.E. Elemike

Abstract


The concentrations of   the five heavy metals; Zinc (Zn), Lead (Pb), Cadmium (Cd), Nickel (Ni) and Copper (Cu) were determined using Atomic Absorption Spectrophotometer (AAS). Results of the analysis, shows  that  the average concentration of the heavy metals at  Ketu - Mile 12  were : Zn  7.175mg/L; Pb 1.288mg/l; Cu 0.531mg/l; Ni 0.223mg/l  and Cd 0.021mg/l  which reflects Zn  77.67; Pb 13.94; Cu 5.75;  Ni  2.41 and Cd 0.22 % with the most abundant pollutant heavy metal  being  Zn  in  all the sites while the least abundant was Cd. It was found that the highest concentration of  each heavy metals in all the sites were  as  follow; Zn  14.93mg/l - Alapere;  Pb 1.720mg/l - Ketu garage;  Cd  0.118mg/l - Mile 12 market;  Ni  0.458mg/l - Mile 12  and  Cu 0.956mg/I - Ketu  garage while the least concentration  of  heavy metals  in  all  the  sites  were as follows: Zn  < 0.005mg/l, Pb < 0.001mg/l), Cd < 0.001mg/l   and  Cu 0.106mg/l - Oniru,  Ni  0.108mg/ - Iyana school. The  most polluted  site  was  Ikosi  road  4.441 mg/l  while the  least  polluted  was  Iyana School  0.327mg/l. The sequence of bioaccumulation and distribution follows the pattern thus:  Zn>Pb>Cu>Ni >Cd.

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