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51

conferenceseries LLC Ltd

3

rd

International Conference on

3

rd

International Conference on

Ecology, Ecosystem and Conservation Biology

Microbial Ecology & Eco Systems

&

March 18-19, 2019 | Chicago, USA

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MARCH 2019 Conference Series LLC Ltd

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.com

JOURNAL OF ECOSYSTEM& ECOGRAPHY 2019, VOLUME 9 | DOI: 10.4172/2157-7625-C1-045

ACCEPTED ABSTRACTS