Resumen

FLORES, Carmen M.; DEL-ANGEL, Ebelia; FRIAS, Dora M.  y  GOMEZ, Ana L.. Evaluation of Physicochemical Parameters and Heavy Metals in Water and Surface Sediment in the Ilusiones Lagoon, Tabasco, Mexico. Tecnol. cienc. agua [online]. 2018, vol.9, n.2, pp.39-57.  Epub 24-Nov-2020. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2018-02-02.

This work was done in the Ilusiones Lagoon located in Villahermosa, Tabasco. It analyzed some of the physicochemical parameters and the concentrations of heavy metals in surface sediments and water. Water samples and surface sediments (0-10 cm) were randomly separated into three different zones for an exploratory analysis. Water parameters were measured in situ with a multiparametric method to determine pH, temperature, electrical conductivity (EC, dS/m), redox potential (ORP), dissolved oxygen (DO %), cation exchange capacity (CIC C mo(+)l/kg) and total salts (TDS mg/kg). In addition, the chemical oxygen demand (COD mg/L) was determined based on the NMX-AA-030-SCFI-2001 standard and organic matter content (OM). Sediment samples were taken according to the NOM-021-Semarnat-2000 (Semarnat 2001a, 2001b). Digestion of the samples were performed according to EPA 3050B and NOM-147-Semarnat/SSA1-2004 guidelines. The NMX-AA-132-SCFI-2006 standard was used to determine heavy metal concentrations using an atomic absorption spectrophotometer. The values of pH in water ranged between 8.9 and 9.6, which were alkaline and above the limits (6.5 - 9.0). The pH of the sediment ranged from 5.9 (slightly acidic) to 8.4 (slightly alkaline) (NOM-021-Semarnat-2000). In the water, the heavy metals Cd, Ni, Cr, Mn, Zn, Al and Pb were all below the NOM-001-Semarnat-1996. The concentrations of Cd, Ni, Cu, Mn, Zn, Pb and Al in the sediments exceeded the criteria for heavy metals established by Canadian and American standards. We conclude that the lake is polluted by illegal discharges of sewage from nearby houses, hospital waste, and infiltration from other polluted lakes.

Palabras llave : Heavy metal; sediment; pollution water; lagoon of Ilusiones.

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