Determination of mercury concentrations in placenta and cord blood of mother and their newborns.

Bor-Cheng Han, Pei-Ling Liu, Jiun-Rong Chen, Ming Jer Shieh

Research output: Contribution to conferencePaper

Abstract

Dental amalgam is a mercury-based filling containing approximately 50% of metallic mercury (Hg(0)). Human placenta does not represent a real barrier to thetransport of Hg(0); hence, fetal exposure occurs as a result of maternal exposure to Hg, with possible subsequent neurodevelopmental disabilities in infants. This study represents a substudy of the international NIH-funded project "Early Childhood Development and polychlorinated biphenyls Exposure in Slovakia".The main aim of this analysis was to assess the relationship between maternal dental amalgam fillings and exposure of the developing fetus to Hg. The study subjects were mother-child pairs (N=99). Questionnaireswere administered after delivery, and chemical analyses of Hg were performed in the samples of maternal and cord blood using atomic absorption spectrometry with amalgamation technique. The median values of Hg concentrations were 0.63 microg/l (range 0.14-2.9 microg/l) and 0.80 microg/l (range 0.15-2.54 microg/l) for maternal and cord blood, respectively. None of the cord blood Hg concentrations reached the level considered to be hazardous for neurodevelopmental effects in children exposed to Hg in utero (EPA reference dose for Hg of 5.8 microg/l in cord blood). A strong positive correlation between maternal and cord blood Hg levels was found (rho=0.79; P<0.001). Levels of Hg in the cord blood were significantly associated with the number of maternal amalgam fillings (rho=0.46, P<0.001) and with the number of years since the last filling (rho=-0.37, P<0.001); these associations remained significant after adjustment for maternal age and education. Dental amalgam fillings in girls andwomen of reproductive age should be used with caution, to avoid increased prenatal Hg exposure.
Original languageEnglish
Publication statusPublished - 2006
EventThe 4th International Academic Conference on Environmental and Occupational Medicine -
Duration: Jun 1 2006 → …

Conference

ConferenceThe 4th International Academic Conference on Environmental and Occupational Medicine
Period6/1/06 → …

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Mercury
Fetal Blood
Placenta
Mothers
Newborn Infant
Dental Amalgam
Maternal Exposure
Slovakia
Polychlorinated Biphenyls
Maternal Age
Spectrum Analysis
Fetus
Education

Cite this

Han, B-C., Liu, P-L., Chen, J-R., & Shieh, M. J. (2006). Determination of mercury concentrations in placenta and cord blood of mother and their newborns.. Paper presented at The 4th International Academic Conference on Environmental and Occupational Medicine, .

Determination of mercury concentrations in placenta and cord blood of mother and their newborns. / Han, Bor-Cheng; Liu, Pei-Ling; Chen, Jiun-Rong; Shieh, Ming Jer.

2006. Paper presented at The 4th International Academic Conference on Environmental and Occupational Medicine, .

Research output: Contribution to conferencePaper

Han, B-C, Liu, P-L, Chen, J-R & Shieh, MJ 2006, 'Determination of mercury concentrations in placenta and cord blood of mother and their newborns.' Paper presented at The 4th International Academic Conference on Environmental and Occupational Medicine, 6/1/06, .
Han B-C, Liu P-L, Chen J-R, Shieh MJ. Determination of mercury concentrations in placenta and cord blood of mother and their newborns.. 2006. Paper presented at The 4th International Academic Conference on Environmental and Occupational Medicine, .
Han, Bor-Cheng ; Liu, Pei-Ling ; Chen, Jiun-Rong ; Shieh, Ming Jer. / Determination of mercury concentrations in placenta and cord blood of mother and their newborns. Paper presented at The 4th International Academic Conference on Environmental and Occupational Medicine, .
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N2 - Dental amalgam is a mercury-based filling containing approximately 50% of metallic mercury (Hg(0)). Human placenta does not represent a real barrier to thetransport of Hg(0); hence, fetal exposure occurs as a result of maternal exposure to Hg, with possible subsequent neurodevelopmental disabilities in infants. This study represents a substudy of the international NIH-funded project "Early Childhood Development and polychlorinated biphenyls Exposure in Slovakia".The main aim of this analysis was to assess the relationship between maternal dental amalgam fillings and exposure of the developing fetus to Hg. The study subjects were mother-child pairs (N=99). Questionnaireswere administered after delivery, and chemical analyses of Hg were performed in the samples of maternal and cord blood using atomic absorption spectrometry with amalgamation technique. The median values of Hg concentrations were 0.63 microg/l (range 0.14-2.9 microg/l) and 0.80 microg/l (range 0.15-2.54 microg/l) for maternal and cord blood, respectively. None of the cord blood Hg concentrations reached the level considered to be hazardous for neurodevelopmental effects in children exposed to Hg in utero (EPA reference dose for Hg of 5.8 microg/l in cord blood). A strong positive correlation between maternal and cord blood Hg levels was found (rho=0.79; P<0.001). Levels of Hg in the cord blood were significantly associated with the number of maternal amalgam fillings (rho=0.46, P<0.001) and with the number of years since the last filling (rho=-0.37, P<0.001); these associations remained significant after adjustment for maternal age and education. Dental amalgam fillings in girls andwomen of reproductive age should be used with caution, to avoid increased prenatal Hg exposure.

AB - Dental amalgam is a mercury-based filling containing approximately 50% of metallic mercury (Hg(0)). Human placenta does not represent a real barrier to thetransport of Hg(0); hence, fetal exposure occurs as a result of maternal exposure to Hg, with possible subsequent neurodevelopmental disabilities in infants. This study represents a substudy of the international NIH-funded project "Early Childhood Development and polychlorinated biphenyls Exposure in Slovakia".The main aim of this analysis was to assess the relationship between maternal dental amalgam fillings and exposure of the developing fetus to Hg. The study subjects were mother-child pairs (N=99). Questionnaireswere administered after delivery, and chemical analyses of Hg were performed in the samples of maternal and cord blood using atomic absorption spectrometry with amalgamation technique. The median values of Hg concentrations were 0.63 microg/l (range 0.14-2.9 microg/l) and 0.80 microg/l (range 0.15-2.54 microg/l) for maternal and cord blood, respectively. None of the cord blood Hg concentrations reached the level considered to be hazardous for neurodevelopmental effects in children exposed to Hg in utero (EPA reference dose for Hg of 5.8 microg/l in cord blood). A strong positive correlation between maternal and cord blood Hg levels was found (rho=0.79; P<0.001). Levels of Hg in the cord blood were significantly associated with the number of maternal amalgam fillings (rho=0.46, P<0.001) and with the number of years since the last filling (rho=-0.37, P<0.001); these associations remained significant after adjustment for maternal age and education. Dental amalgam fillings in girls andwomen of reproductive age should be used with caution, to avoid increased prenatal Hg exposure.

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