TITLE:
Heavy Metal Speciation and Health Risk Assessment of Soil and Jute Mallow (Corchorus Olitorus) Collected From a Farm Settlement in Ikorodu, Lagos, Nigeria
AUTHORS:
Olatunji Mojeed Makanjuola, Babatunde Saheed Bada, Oriyomi Olalekan Ogunbanjo, Olanrewaju Olusoji Olujimi, Oluseyi Adeboye Akinloye, Moyosoluwa Odunayo Adeyemi
KEYWORDS:
Inorganic Fertilizer, Pesticides, Health Risk, Jute Mallow, Heavy Metals
JOURNAL NAME:
Journal of Agricultural Chemistry and Environment,
Vol.8 No.4,
November
29,
2019
ABSTRACT: There is an increasing global concern for adverse
effects of inorganic fertilizer and pesticides applied to agricultural soils.
This study investigated metal speciation in soil and health risk assessment of
Jute mallow (Corchorus olitoriuos)
from a farm settlement in Ikorodu, Lagos State. Soil samples were collected
according to the set standard procedure, sequentially extracted and analyzed
for selected heavy metals using standard methods. Results showed that chromium
(Cr) was associated with reducible fraction (Fe-Mn) for top soil, while cadmium
(Cd), manganese (Mn), and copper (Cu); lead (Pb) and nickel (Ni); and Cr were
predominantly bound to carbonate, reducible and residual mineral components
respectively for sub-soil. The results of Contamination Factor (CF),
Contamination Degree (CD), Pollution Load Index (PLI) and Geoaccumulation Index
(Igeo) showed that the soil samples were not polluted for all the
investigated metals. The Cd level in the soil (13.54 ± 1.21 mg·kg﹣1) and vegetables (0.83 ± 0.05 mg·kg﹣1) were above the USEPA critical permissible limit
of 3.0 mg·kg﹣1 and 0.1 - 1.2 mg·kg﹣1 respectively. The daily intake of estimated
selected heavy metals from the vegetable ranged from 8.8 × 10﹣03 to 1.4 × 10﹣02 for adult and 3.8 × 10﹣03 to 1.1 × 10﹣02 for children while the Hazard Quotient (HQ) for adults
ranged from 5.4 × 10﹣05 to 1.1 × 10﹣01 and that of children ranged from 8.3 × 10﹣03 to 1.4 × 10﹣02. The cancer risk (CR) values of heavy metals in the soil
ranged from 1.02 × 10﹣11 to 9.90 ×