Abstract

ABELLA G, Johanna P.  and  MARTINEZ C, María J. CONTRIBUTION OF A TRIBUTARY STREAM TO EUTROPHICATION OF LAKE TOTA (BOYACÁ, COLOMBIA). Rev.Colomb.Quim. [online]. 2012, vol.41, n.2, pp.243-262. ISSN 0120-2804.

The aim of this study was to characterize physicochemically “Las Cintas” stream located at Tota Lake, Boyacá department. Temperature, pH, conductivity, dissolved oxygen, COD, BOD5, concentration of nitrogen (nitrates and nitrites) and phosphorus (total phosphorus, total hydrolysable phosphorous, total orthophosphate and total organic phosphorus) were measured. To perform the characterization, samples were collected in six sampling dates, between September and November of 2009, at five points selected along the stream. The analyses were carried out following normalized procedures for water analysis. The results obtained show little changes in temperature, pH, conductivity and dissolved oxygen behavior; Nitrate values indicating that the proximity of the crops to the stream, rises the concentration of these ions, which can be carried to the Lake by run off; The different phosphorous species evaluated allow to establish the highest contribution of organic phosphorus towards the water body, and the input of phosphorous by detergents spilled in the stream. With results it can be established that onions crops provides nutrients which probably support eutrophication processes at the Lake Tota.

Keywords : eutrophication; nitrates; nitrites; phosphorous; crop growth; Lake Tota.

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