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Characterization of metals in indoor dusts from electronic workshops, cybercafés and offices in southern Nigeria: Implications for on-site human exposure.

Abstract：

:The levels of Cd, Pb, Cr, Ni, Cu, Co, Ba, Mn, Zn, Al and Fe were evaluated in indoor dusts from electronic workshops, cybercafés and offices in southern Nigeria. The study was aimed at providing information on the distribution patterns, and the associated risks that may arise from exposure of humans to these metals in indoor dusts from the three work environments. The dust samples were digested with aqua-regia and analyzed for the metal concentrations by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The metal concentrations (mg kg-1) in the indoor dusts from these work environments ranged from 0.2 to 20.5 Cd, 0.6-4810 Pb, 8.65-2210 Cr, 1.85-209 Ni, 6.75-2820 Cu, 0.25-19.6 Co, 22.7-597 Mn, 6.65-140 Ba, 43.3-7310 Zn, 1040-16,800 Al and 969-78,300 Fe. The metal distribution patterns in these dust samples followed the order: electronic workshops > cybercafés > offices. The concentrations of Cd, Pb and Cu in significant proportions of the dust samples from the electronic workshops and cybercafés surpassed their respective permissible limits in soils. The health risk assessment suggests considerable non-cancer risks arising from childhood contact with Pb in dust from the electronic workshops while no considerable non-cancer risk is associated with the adult and child exposure to dust from the cybercafés and offices. The results indicated that Cr and Pb are the main elements responsible for the non-carcinogenic risk arising from childhood exposure to electronic workshop dusts. The carcinogenic risk due to exposure of humans to metals in these dust samples were within the range regarded as safe by the USEPA.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Iwegbue CMA,Obi G,Emoyan OO,Odali EW,Egobueze FE,Tesi GO,Nwajei GE,Martincigh BS

doi

10.1016/j.ecoenv.2018.04.070

subject

Has Abstract

pub_date

2018-09-15 00:00:00

pages

342-353

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(18)30372-5

journal_volume

159

pub_type

杂志文章

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