Chemical Speciation and Health Risk Assessment of Fine Particulate Bound Trace Metals Emitted from Ota Industrial Estate, Nigeria
2017
In this study carcinogenic and non-carcinogenic health risk due to exposure to
PM2.5-bound trace metals from an industrial area in Southwestern Nigeria was estimated. A
four-step chemical sequential extraction procedure was employed for the chemical extraction
of arsenic (As), cadmium (Cd), chromium (Cr) copper (Cu), manganese (Mn), nickel (Ni), and
zinc (Zn). Samples were analyzed using inductively coupled plasma mass spectrometry (ICPMS).
Results reveal Cr and Cu as the most dominant exchangeable fraction metals, indicating
possibility of their being readily soluble once PM2.5 is inhaled. Cd and Cr record the highest
bioavailability index of 0.7. The cumulative lifetime cancer risks due to inhalation exposure for
adults (4.25×10-2), children 1-6 years old (4.87×10-3), and children 6-18 years old (1.46×10-2)
were found above Environmental Protection Agency’s acceptable range of 1×10-6 to 1×10-4.
The hazard index values for all studied trace metals suggest significant potential for noncarcinogenic
health risks to adults and children. The choice of chemical speciation as an
essential tool in facilitating a better predictive insight on metal bioavailability and toxicity for
immediate remediation action has been highlighted.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
14
References
5
Citations
NaN
KQI