Investigation of lead pollution in suspended particles inside and outside residential, office and commercial buildings in Karaj metropolis

Heavy metal pollution of airborne particles is a serious problem in the urban environment and has been considered by many researchers. Among heavy metals, lead is an element that enters suspended particles from various sources. In this research, the amount of lead in suspended particles indoor and outdoor the building of Karaj metropolis has been investigated.
Material and

Sampling of suspended particles was performed in December 2019 from 23 stations indoor and outdoor the building in Karaj metropolis. In order to measure the amount of lead in the collected samples, wet chemical digestion method was used by nitric acid/perchloric acid combination. Finally, the concentration of lead metal was measured using ICP-MS.

Based on the findings of this study, the highest levels of lead indoor and outdoor the buildings were measured as 858.73 and 446.28 μg/g, respectively. Also, a significant difference was observed between the amount of lead indoor and outdoor the building and in addition between different stations, in some stations the amount of lead indoor and in some stations outdoor the building the amount of this element was measured more.
Discussion and

Lead analysis in indoor and outdoor dust samples in Karaj metropolis shows the spatial distribution of this pollutant in different stations based on pollutant sources. Examination of the results of one-way analysis of variance test showed that in areas with higher traffic load, the amount of lead in dust samples collected inside and outside the building was higher than other stations.