| Fish consumption and bioindicators of inorganic mercury exposure. | |
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MedLine Citation:
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PMID: 17198723 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: The direct and close relationship between fish consumption and blood and hair mercury (Hg) levels is well known, but the influence of fish consumption on inorganic mercury in blood (B-IHg) and in urine (U-Hg) is unclear. OBJECTIVE: Examine the relationship between fish consumption, total, inorganic and organic blood Hg levels and urinary Hg concentration. METHODS: A cross-sectional study was carried out on 171 persons from 7 riparian communities on the Tapajós River (Brazilian Amazon), with no history of inorganic Hg exposure from occupation or dental amalgams. During the rising water season in 2004, participants responded to a dietary survey, based on a seven-day recall of fish and fruit consumption frequency, and socio-demographic information was recorded. Blood and urine samples were collected. Total, organic and inorganic Hg in blood as well as U-Hg were determined by Atomic Absorption Spectrometry. RESULTS: On average, participants consumed 7.4 fish meals/week and 8.8 fruits/week. Blood total Hg averaged 38.6+/-21.7 microg/L, and the average percentage of B-IHg was 13.8%. Average organic Hg (MeHg) was 33.6+/-19.4 microg/L, B-IHg was 5.0+/-2.6 microg/L, while average U-Hg was 7.5+/-6.9 microg/L, with 19.9% of participants presenting U-Hg levels above 10 microg/L. B-IHg was highly significantly related to the number of meals of carnivorous fish, but no relation was observed with non-carnivorous fish; it was negatively related to fruit consumption, increased with age, was higher among those who were born in the Tapajós region, and varied with community. U-Hg was also significantly related to carnivorous but not non-carnivorous fish consumption, showed a tendency towards a negative relation with fruit consumption, was higher among men compared to women and higher among those born in the region. U-Hg was strongly related to I-Hg, blood methyl Hg (B-MeHg) and blood total Hg (B-THg). The Odds Ratio (OR) for U-Hg above 10 microg/L for those who ate >4 carnivorous fish meals/week was 4.00 [1.83-9.20]. CONCLUSION: This study adds further evidence to a positive relation between fish consumption and IHg in both blood and urine, which may result from absorption of IHg from fish or from demethylation of MeHg. The findings support the importance of assessing IHg exposure in fish-eating communities. Further studies should examine the potential toxicity of IHg in heavy fish consumers. |
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Authors:
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Carlos José Sousa Passos; Donna Mergler; Mélanie Lemire; Myriam Fillion; Jean Rémy Davée Guimarães |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-01-02 |
Journal Detail:
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Title: The Science of the total environment Volume: 373 ISSN: 0048-9697 ISO Abbreviation: Sci. Total Environ. Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-01-22 Completed Date: 2007-03-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0330500 Medline TA: Sci Total Environ Country: Netherlands |
Other Details:
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Languages: eng Pagination: 68-76 Citation Subset: IM |
Affiliation:
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Centre de recherche interdisciplinaire sur la biologie, la santé, la société et l'environnement (CINBIOSE), Université du Québec à Montréal, Montréal, Québec, Canada. sousa_passos.carlos_jose@courrier.uqam.ca |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Aged Animals Brazil Environmental Monitoring Female Fishes* Food Contamination* Humans Male Mercury / blood*, urine* Middle Aged Water Pollutants, Chemical / blood*, urine* |
| Chemical | |
Reg. No./Substance:
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0/Water Pollutants, Chemical; 7439-97-6/Mercury |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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