Abstract
Lead exposure has been shown to be harmful to humans in various settings and there are no safe levels of blood lead in children. At an Alternative Superfund site in Hayden-Winkelman, Arizona, with an active copper smelter and concentrator, lead exceedances in air and soil have been measured in the past 20 years. In this work, the US Environmental Protection Agency’s Integrated Exposure Uptake Biokinetic (IEUBK) model was used to estimate Hayden-Winkelman children’s (age 6 months–7 years) blood lead levels (BLLs) using site-specific lead concentrations measured in indoor and outdoor air, soil, indoor dust, and drinking water. Values used by a state agency’s airborne lead risk forecast program were also evaluated to determine whether their forecasting program is useful in protecting children’s public health. Using site-specific values in the model, the results demonstrated that lead ingested via indoor dust was the major contributor to children’s BLLs. In addition, the output of the IEUBK model overestimated actual BLLs of children sampled in the community. The IEUBK model was particularly sensitive to high indoor dust levels, and these site-specific measures increased modeled BLL values. This finding is of significance as the IEUBK model is used worldwide in communities with industrial contamination. This study confirmed that the chief contributor to lead exposure in children is household dust. Thus, for lead exposure risk reduction, agencies working at Superfund sites should focus efforts on decontaminating outdoor soil and dust and indoor lead decontamination.
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Acknowledgements
The authors are grateful for the time and effort of Hayden-Winkelman School District and leadership. We would also like to give a special thank you to our colleagues in the Integrated Environmental Science and Health Risk Laboratory (specifically, Jesus Solis-Leon and Kunal Palawat), Dust Laboratory, and the Arizona Laboratory for Emerging Contaminants. Lastly, we would like to thank the Arizona Department of Environmental Quality for the additional background information.
Funding
This work was in part, funded by the National Institute of Environmental Health Sciences Superfund Research Program (P42ES04940).
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MDR-A conceptualized the study. methodology: MDR-A, DH, AES, EB; investigation: DH and MDR-A; resources: TR-C, KR, MDR-A; formal analysis: DH; validation: DH; writing—original draft: DH; writing—review and editing: DH, MDR-A, AES, EB; supervision: MDR-A: project administration: MDR-A.
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Heusinkveld, D., Ramírez-Andreotta, M.D., Rodríguez-Chávez, T. et al. Assessing Children’s Lead Exposure in an Active Mining Community Using the Integrated Exposure Uptake Biokinetic Model. Expo Health 13, 517–533 (2021). https://doi.org/10.1007/s12403-021-00400-0
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DOI: https://doi.org/10.1007/s12403-021-00400-0