Evidence of natural and anthropogenic impacts on rainwater trace metal geochemistry in central Mexico: A statistical approach

D. M. Rivera-Rivera, D. C. Escobedo-Urías, M. P. Jonathan, S. B. Sujitha, S. Chidambaram

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4 Scopus citations

Abstract

Trace metals Fe, Mn, Cr, Cu, Ni, Co, Pb, Zn, Cd, and As were determined on a monthly basis in a total of 52 rain samples collected from six different locations in the central region of Mexico during March 2016-April 2017. The average concentrations of trace metals (mg/L) in the rainwater samples showed an order of Zn (0.873) > Fe (0.395) > Mn (0.083) > Cr (0.041) ≥ Cu (0.041) > Pb (0.031) > Ni (0.020) > Co (0.013) > As (0.0003) > Cd (0.002). The differences observed in metal concentrations are related to variations in the influence of continental air masses, local transport, regional advection, and the solubility of trace metals. High concentrations of metals were observed in the months of March to May at all sites, probably due to the less extensive removal of air/air pollutants. The values obtained from the enrichment factor (EF) per metal showed relatively high values for Cd, Zn, Cu, Pb, Co, Ni, and Cr, suggesting anthropogenic origin. Pearson's correlation matrix validated the distribution of trace metal sources and their relationships with local/regional meteorological characteristics. This paper presents relevant basic information for the evaluation of the toxic potential of rainwater and the possible health risks when using this source of water for human consumption.

Original languageEnglish
Article number192
JournalWater (Switzerland)
Volume12
Issue number1
DOIs
StatePublished - 1 Jan 2020

Keywords

  • Central Mexico
  • Geochemistry
  • Provenance
  • Rainwater
  • Trace metals

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