Resumo

MONTELONGO CASANOVA, ROSALBA et al. MODELING OF THE QUALITY OF WATER OF RIVER TULA, STATE OF HIDALGO, MEXICO. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.154, pp.5-18. ISSN 0012-7353.

The central objective of this work is to model the quality of the water of Tula River, from the central emitter to their confluence with the Endhó dam. It was evaluated during two years, considering a length of 50 km in 4 zones and 35 sites of sampling. The central emitter contributes to the greater amount of organic matter, water without treatment of the City of Mexico and co urbane zone. The values of DBO varied from 1.16 up to 486.81 mg O₂/L; the oxygen dissolved between 1.52 and 5.82 mg/L, this implies affectation for the development of the aquatic life. The alkalinity exceeded the ecological criteria of quality as a source of potable water with value of 458.01 mg/L. The fats displayed variations from 0.9 mg/L up to 18.1 mg/L and ammonia cal nitrogen outside the limits established for protection of the aquatic life with values from 0.09 a 64 mg/L; nitrates (6.24 mg/L) and nitrites (0.5-1.304 mg/L) exceed the ecological criteria. The metals cadmium, lead, iron, manganese and zinc are in concentrations over the permissible rank and in some sections mercury presence was reported. The fecal coliforms were detected in values from 2.1 x10⁴ up to 2.40 x10¹¹ NMP/100 milliliters. In general, the toxicity in the residual water unloading demonstrated that all appears of moderate to high. Only there were three monitored stations (19%) with excellent quality, 3 smaller or equal DBO₅ to mg/L, which is considered like water no contaminated by biodegradable organic matter.

Palavras-chave : Contamination; classification; quality; mathematical model.

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