Assessing Children's Lead Exposure in an Active Mining Community Using the Integrated Exposure Uptake Biokinetic...

Area of Science:

• Environmental Science
• Public Health
• Toxicology

Background:

• Lead exposure poses significant health risks to children, with no safe blood lead levels established.
• An Arizona Superfund site with an active copper smelter has documented lead exceedances in air and soil.

Purpose of the Study:

• To estimate children's blood lead levels (BLLs) in Hayden-Winkelman, Arizona, using the Integrated Exposure Uptake Biokinetic (IEUBK) model.
• To evaluate the utility of a state agency's airborne lead risk forecast program for public health protection.
• To identify the primary contributors to lead exposure in children at the Superfund site.

Main Methods:

• Utilized the U.S. Environmental Protection Agency's IEUBK model with site-specific lead concentrations from air, soil, indoor dust, and drinking water.
• Collected and analyzed data on lead concentrations in various environmental media.
• Compared IEUBK model outputs with actual blood lead levels in community children.

Main Results:

• Ingestion of lead via indoor dust was identified as the major contributor to children's BLLs.
• The IEUBK model, using site-specific data, tended to overestimate actual BLLs.
• The model showed high sensitivity to indoor dust concentrations, significantly increasing modeled BLLs.

Conclusions:

• Household dust is the primary source of lead exposure for children in the studied community.
• The IEUBK model's sensitivity to indoor dust highlights the importance of this exposure pathway.
• Superfund site remediation efforts should prioritize decontamination of outdoor soil/dust and indoor lead sources to reduce children's exposure.