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.

ABSTRACT:

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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