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Mercury exposure in utero and during infancy
G Sandborgh-Englund1, K Ask, E Belfrage
1Department of Odontology, Karolinska Institutet, Huddinge, Sweden. Gunilla-Sandborgh@ofa.ki.se
Journal of Toxicology and Environmental Health. Part A
|July 27, 2001
Summary
Newborns show higher methylmercury (MeHg) levels than mothers, which decrease over time. Inorganic mercury (I-Hg) levels in infants remain low, suggesting milk is not a major exposure route.
Area of Science:
- Environmental Health
- Toxicology
- Pediatrics
Background:
- Mercury exposure during pregnancy is a significant public health concern.
- Methylmercury (MeHg) and inorganic mercury (I-Hg) are two forms of mercury with different toxicological profiles.
- Understanding mercury transfer and infant exposure is crucial for risk assessment.
Purpose of the Study:
- To quantify and compare methylmercury (MeHg) and inorganic mercury (I-Hg) levels in maternal and infant blood.
- To investigate the changes in infant mercury levels post-delivery.
- To assess the potential contribution of breast milk to infant mercury exposure.
Main Methods:
- Blood samples were collected from mothers and their infants up to 2 months after delivery.
- Umbilical cord blood and maternal blood mercury levels were analyzed.
- Infant blood mercury concentrations were measured at 72 hours and 2 months postpartum.
Main Results:
- Significant correlations were found between maternal and umbilical cord blood for both MeHg and I-Hg.
- MeHg levels were higher in cord blood than maternal blood; I-Hg levels were similar.
- Infant MeHg levels decreased significantly (>45%) from 72 hours to 2 months; I-Hg levels remained low.
Conclusions:
- Infant mercury levels, particularly MeHg, decrease significantly after birth.
- Low infant I-Hg levels suggest that breast milk is not a primary source of I-Hg exposure.
- Further research with larger sample sizes is needed to confirm these findings on mercury exposure in infants.
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