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Mining leachate contamination and subfecundity among women living near the USA–Mexico border

  • Raquel Rivera CarvajalEmail author
  • Hector Duarte-Tagles
  • Álvaro J. Idrovo
Original Paper

Abstract

The contamination of the Sonora River with 40,000 m3 of toxic leachate released from a copper mine on August 6, 2014, was considered the worst environmental disaster of the mining industry in Mexico, exceeding safety levels in the concentrations of heavy metals and arsenic. To explore the potential association of the toxic release with subfecundity, by comparing time to pregnancy (TTP) of women with different levels of exposure at municipalities located along the Sonora River watershed, just 35 km south of the Arizona–Mexico border. Data from 235 pregnancies were included in a retrospective cohort study. Exposure was measured whether pregnancy occurred before or after the disaster and included a non-exposed community outside the watershed. Pregnancies were also compared between communities according to the concentration-level gradient of water pollutants found in the river. Fecundability odds ratios (fORs) were calculated using discrete time analogue of Cox’s proportional hazard models. Multiple analysis included all pregnancies with TTP of no more than 12 months, only first-time pregnancy, or excluding women with TTP = 1. The probability for pregnancy decreased after the disaster (fOR 0.55, 95% CI 0.31, 0.97), when the residency was located mid-or-downstream the watershed (fOR 0.37, 95% CI 0.15, 0.91), when reported chicken consumption, when mining was the father’s occupation, and when surface water was reported to be used for crop irrigation and for animal consumption. There was a decrease in fecundity on women exposed to the contaminated river. There is a need for more studies to prove these findings and to broaden the knowledge of other possible adverse health effects associated with this environmental disaster.

Keywords

Water pollution Time to pregnancy Environmental disaster of the mining industry 

Notes

Acknowledgements

We give special thanks to participants of the study, to Derheyz Ochoa for the collaboration during the pilot study, to the research team of the Universidad de Sonora (senior medical students 2017) and from the Universidad Industrial de Santander.

Compliance with ethical standards

Conflict of interests

The authors declare they have no actual or potential competing financial interests.

Ethical statement

The study was evaluated as low-risk study by the ethical committee of the Universidad de Sonora, Mexico, and the scientific research ethics committee of the Universidad Industrial de Santander, Colombia.

Supplementary material

10653_2019_275_MOESM1_ESM.docx (49 kb)
Supplementary material 1 (DOCX 49 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Raquel Rivera Carvajal
    • 1
    Email author
  • Hector Duarte-Tagles
    • 2
  • Álvaro J. Idrovo
    • 1
  1. 1.Public Health Department, School of MedicineUniversidad Industrial de SantanderBucaramangaColombia
  2. 2.Medicine and Health Sciences DepartmentUniversidad de SonoraHermosilloMexico

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