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Evolution of
contamination features
and health risk of
potentially toxic metals
in dust from selected
schools in Shiraz
megacity, SW Iran
Tahereh Moghtaderi
1
and
Milad Mirzaei Aminiyan
2
1
Islamic Azad University, Iran
2
Bu-Ali Sina University, Iran
T
he concentrations of
eight potentially toxic
metals (i.e., As, Co, Cr, Cu,
Cd, Ni, Pb, and Zn) and their
contamination levels in dust
collected from some schools
of Shiraz city, Iran, have been
studied in this work. The
Pollution of studied metals was
assessed using the pollution
index (PI), geoaccumulation
index (Igeo), and enrichment
factor (EF). The results of
calculated PLI showed that
the contamination status
can more likely belong to the
anthropogenic activities in
this region. Statistical analyses
results also showed that traf c
sources and combustion of
fossil fuels, as well as industrial
activities, are important
factors contributing to the rise
concentrations of heavy metals
in school dust. According to
the present situation, the non-
cancer risk of individual metals
for both, children and adults
followed the decreasing trend
of Pb> Cr> As> Ni> Cd> Cu>
Zn> Co and Cr> Pb> As> Cd>
Ni> Cu> Zn> Co, respectively.
The HI value of Pb and Cr for
children is very close to the
safety limit. However, the HI
values of other studied metals
were in the safe level. In terms
of cancer health risk, Cr, As,
and Pb present at most of the
study schools were found to
be within the cancer threshold
limit. Meanwhile, the cancer
risk of exposure to Cd, Ni, and
Co was the lowest and could
be neglected. The ndings of
the present study indicate that
more investigations should
be spent to potentially toxic
metal contaminations of dust
from schools of Shiraz city,
especially for Cr, As, and Pb.
tmoghtaderi62@yahoo.comJOURNAL OF ECOSYSTEM& ECOGRAPHY 2019, VOLUME 9 | DOI: 10.4172/2157-7625-C1-045
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