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Trace Elemental Characterization of Chalk Dust and Their Associated Health Risk Assessment

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Abstract

It is evident that chalk produces dust on use, i.e., particulate matter, which will alter the air quality of classrooms and can cause health hazards in teachers. The possible causes for health effects of chalk dust on teachers are still unclear. Hence, the aim of this study is to estimate the concentration of trace elements (Al, Cr, Mn, Fe, Co, Ni, Si, Pb) in chalk dust collected from classrooms by using ICP-MS. Both suspended and settled chalk dust was collected from selected classrooms. Suspended chalk dust was collected with PM2.5 filter paper using fine dust sampler, and settled chalk dust was collected by placing petriplates at a distance of 3 m from the board for a duration period of 30 min. Scanning electron microscopy images of chalk dust were taken up. Potential health risk analysis was also assessed. Results showed that Al, Fe, and Mn are in higher concentration (>1000 μg kg−1) in both settled and suspended chalk dust. Cr, Mn, Fe, Co, and Ni were beyond the minimal risk levels in both settled and suspended chalk dust. There are no minimal risk levels for the elements Al, Si, and Pb. The concentration of trace elements in suspended chalk dust was higher than that in settled chalk dust. The SEM images of PM2.5 filter papers (suspended chalk dust) showed that all pores of the sampled filter papers are clogged with chalk dust. The few SEM images of the settled chalk dust showed fibrous shape which is associated with good-quality chalk whereas others showed circular and more aggregated nature of chalk dust from low-quality chalk from which the dust production will be very high. As observed from the result that the trace elements concentration was high in the suspended chalk dust, the fact can be correlated with the SEM images which have shown high density of absorbed chalk dust. With reference to human health risk, dermal exposure was the main route of exposure followed by inhalation and ingestion. Al (aluminum), Fe (iron), Si (silicon), and Mn (manganese) are the major contributors for the non-carcinogenic effects. For all the elements, the carcinogenic effect calculated (LADD) is within the global acceptable limit (10−6–10−4).

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Acknowledgments

The authors are grateful to the UGC (University Grants Commision) New Delhi for providing financial assistance to carry out this work. The authors are also grateful to the Centre for studies on Bay of Bengal Laboratory, Andhra University, for permitting us to carry out the ICP-MS analysis in their laboratory. The authors are also grateful to the GITAM University for providing necessary lab facilities.

Authors’ Contributions

All the authors read and approved the final manuscript.

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Authors and Affiliations

  1. Department of Environmental Studies, GITAM Institute of Science, GITAM University, Visakhapatnam, AP, India

    Y. A. Maruthi & S. Ramprasad

  2. Department of Physics, GITAM Institute of Science, GITAM University, Visakhapatnam, AP, India

    N. Lakshmana Das

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  1. Y. A. Maruthi
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  2. S. Ramprasad
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  3. N. Lakshmana Das
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Correspondence to Y. A. Maruthi.

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Maruthi, Y.A., Ramprasad, S. & Lakshmana Das, N. Trace Elemental Characterization of Chalk Dust and Their Associated Health Risk Assessment. Biol Trace Elem Res 175, 466–474 (2017). https://doi.org/10.1007/s12011-016-0769-1

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