Mercury Levels in Hair of Pregnant Women in Tumbes, Peru: A Cross-Sectional Study

Sofia Chapela-Lara School of Public Health, Oregon Health and Science University—Portland State University, Portland, Oregon;

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Olivia Arar School of Public Health, Oregon Health and Science University—Portland State University, Portland, Oregon;

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Lauralee Fernandez School of Public Health, Oregon Health and Science University—Portland State University, Portland, Oregon;

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Denys Villarreal-Palacios Universidad Peruana Cayetano Heredia, Lima, Peru;

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Percy Vilchez-Barreto Universidad Peruana Cayetano Heredia, Lima, Peru;

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Ricardo Gamboa-Moran Universidad Peruana Cayetano Heredia, Lima, Peru;

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Sarah E. Rothenberg College of Health, Oregon State University, Corvallis, Oregon;

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William K. Pan Duke University Global Health Institute and Nicholas School of Environment, Durham, North Carolina

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Seth E. O’Neal School of Public Health, Oregon Health and Science University—Portland State University, Portland, Oregon;

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ABSTRACT.

Mercury, a potent toxin that poses serious risks to human health, particularly for pregnant women and young children, is widely present due to artisanal and small-scale gold mining (ASGM), which impacts water quality. The objective of this study was to evaluate methylmercury exposure among pregnant women in communities downstream from ASGM sites. We characterized hair total mercury (THg) concentrations among 148 pregnant women across 24 communities in the Tumbes region of Peru, downstream from ASGM sites in Ecuador. Using purposeful sampling, we classified communities into three exposure risk zones: Puyango-Tumbes River watershed, Coast, and Zarumilla. The mean THg concentration was 2.08 µg/g ± 1.36, with 45% of participants (67/148) exceeding UNEP/WHO exposure limits (>2.0 µg/g). The median was 1.84 with an interquartile range (IQR) from 1.01 to 2.83. Median THg levels were significantly higher in the Puyango-Tumbes River region (2.72 µg/g; IQR: 1.66–3.55) compared with Zarumilla (1.61 µg/g; IQR: 0.67–2.63; P = 0.001) and to the Coast (1.71 µg/g; IQR: 1.13–2.50; P = 0.01), suggesting that living close to the Puyango-Tumbes River may be associated with a higher mercury exposure risk. After controlling for potential confounders, individuals in the Puyango-Tumbes watershed exhibited a significant 57% higher expected geometric mean of hair THg compared with Zarumilla (95% CI: 0.1–146.2%). These findings underscore the importance of identifying high-risk regional populations and ongoing biomonitoring of the Puyango-Tumbes River watershed.

Author Notes

Financial support: This research was funded by the National Institute of Environmental Health Sciences (P30 ES030287) through the Pacific Northwest Center for Translational Environmental Health Research Pilot Projects Program. Partial funding support for research capacity building was also provided by the US National Institute of Neurological Disorders and Stroke and the John E. Fogarty International Center (R01NS103623).

Disclosure: The research protocols were approved by the Institutional Ethics Committee for Humans at the Universidad Peruana Cayetano Heredia (inscription code 200724) and the Institutional Review Board at Oregon Health and Science University (ID number STUDY00021063).

Current contact information: Sofia Chapela-Lara, Olivia Arar, Lauralee Fernandez, and Seth E. O’Neal, School of Public Health, Oregon Health and Science University, Portland State University, Portland, OR, E-mails: chapelal@ohsu.edu, arar@ohsu.edu, lauralf2@pdx.edu, and oneals@ohsu.edu. Denys Villarreal-Palacios, Percy Vilchez-Barreto, and Ricardo Gamboa-Moran, Universidad Peruana Cayetano Heredia, Lima, Peru, E-mails: denys.villareal@upch.pe, percy.vilchez.b@upch.pe, and ricardo.gamboa.m@upch.pe. Sarah E. Rothenberg, College of Health, Oregon State University, Corvallis, OR, E-mail: sarah.rothenberg@oregonstate.edu. William K. Pan, Duke University Global Health Institute and Nicholas School of Environment, Durham, NC, E-mail: william.pan@duke.edu.

Address correspondence to Sofia Chapela-Lara, School of Public Health, Oregon Health and Science University—Portland State University, 1810 SW 5th Ave, Portland, OR 97201. E-mail: chapelal@ohsu.edu
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