Publisher: Chemical Society of Nigeria

Deposition of Heavy Metals Around Katsina Steel Rolling Company In Katsina Township Using Bark of Neem Tree ( AZADIRACHTA INDICA) As Bioindicator

W. L. O Jimoh, S. A. Fowotade.
KEYWORDS: Bark, Bioindicator, Metal, Neem and Pollution.


The bark of neem tree (Azadirachta indica) is used in this study as bio-indicator to monitor heavy metal pollution in Katsina township. Barks are sampled from four sites in Katsina township, which include; Katsina Steel Rolling Company Round-about (Site A), Kofar Kwaya Round-about (Site B), Kofar Yandaka Round-about (Site C) and Nigeria Army Barrack, Natsinta (Site D). The samples are analyzed for Iron, Manganese, Copper, Lead, Cobalt, Chromium, Nickel and Zinc using atomic absorption spectrophotometry (AAS). The result obtained reveals heavy metal levels ranging from 52.50μgg–1 – 196.25μgg–1(Fe), 19.50μgg–1– 34.25μgg–1(Mn), 2.41μgg–1 – 8.43 μgg–1(Zn), <0.01 μgg–1 – 18.75 μgg–1 (Cr), 3.01 μgg–1 – 11.50 μgg–1 (Co), <0.01 μgg–1 – 3.50 μgg–1 (Pb), 1.00 μgg–1 – 4.25 μgg–1 (Ni) and 0.13 μgg–1 – 2.75 μgg–1(Cu) across the four sites. The resuls also shows the concentrations of Iron correlating significantly with distance from the Steel Rolling Company, the source of contamination. The heavy metal burdens from site A are the highest while those from site D are the least. The result also indicates a somewhat correlation between the heavy metal concentrations and distance of each site from the source of contamination with the exception of copper, lead and zinc concentrations. Amidst the heavy metal analyzed, Fe has the highest level while Cu has the least. It is concluded that neem bark is a good biomonitor for air quality monitoring.

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