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Hazard assessment of lead
C D Carrington1, D M Sheehan, P M Bolger
1Division of Toxicological Review and Evaluation (HFF-156), Food and Drug Administration, Washington, DC 20204.
Food Additives and Contaminants
|May 1, 1993
Summary
Lead exposure is a public health concern, with low blood lead levels (BLLs) causing developmental issues in children and infants. Regulatory agencies use these BLLs to set tolerable lead intake levels for various age groups.
Area of Science:
- Environmental Health
- Toxicology
- Public Health
Background:
- Lead (Pb) exposure is a significant concern for US regulatory agencies.
- Low blood lead levels (BLLs) are linked to adverse neurodevelopmental outcomes in children and infants.
- Elevated BLLs in adults are associated with health issues like hypertension.
Purpose of the Study:
- To establish lowest-observed-effects levels (LOELs) for lead exposure in developing and adult populations.
- To estimate daily ingestion levels corresponding to concerning BLLs for different demographic groups.
- To derive provisional total tolerable intake levels for lead.
Main Methods:
- Utilized existing data associating BLLs with adverse health effects.
- Estimated daily Pb ingestion levels for children (≤6 and 7+ years), pregnant women, and adults based on target BLLs.
- Applied the Renwick approach to derive tolerable exposure levels from BLLs.
Main Results:
- Identified BLLs of 10 µg/dL for children/infants and 30 µg/dL for adults as LOELs.
- Estimated daily Pb ingestion levels: 60 µg/day (children ≤6), 150 µg/day (children 7+), 250 µg/day (pregnant women), 750 µg/day (adults).
- Derived provisional total tolerable intake levels for lead for each population group.
Conclusions:
- Established critical BLLs and corresponding ingestion levels for various population segments.
- Provided a basis for regulatory guidelines on safe lead intake.
- Highlighted the need for continued monitoring and control of lead exposure.