Abstract

CARRENO, Carmen et al. TOXICITY EVALUATION OF SEDIMENTS FROM THE LERMA RIVER UPPER COURSE, MEXICO. Rev. Int. Contam. Ambient [online]. 2018, vol.34, n.1, pp.117-126. ISSN 0188-4999.  https://doi.org/10.20937/rica.2018.34.01.10.

The aim of this study was to evaluate the toxicity of sediments in the upper course of the Lerma River (UCLR), in the State of Mexico by means of Microtox® test using the basic solid phase test protocol. The surface sediment samples were collected in 23 sites distributed following the main stream flow of the river: 12 on the river and 11 on its tributaries for two sampling campaigns in a one year period. Half maximal effective concentration (EC50) in Vibrio fischeri varied in the river sediment from 139 mg/L to 3588 mg/L and for the tributaries it varied between 108 mg/L to 16436 mg/L. In general, sediments of the UCLR can be classified as extremely toxics which show the impact of anthropogenic contributions that come from urban and industrial untreated discharges.

Keywords : microtox®; water pollution.

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