Abstract

ROBLEDO, José; VANEGAS CHACON, Eddi Alejandro  and  GARCIA ALVAREZ, Nancy. Water quality Izabal Lake, Guatemala. Temporary and spatial relations of physical-chemical and biologicals variables. Rev Cie Téc Agr [online]. 2014, vol.23, n.4, pp. 28-32. ISSN 2071-0054.

The preservation of Izabal Lake depends on the water quality control of its tributaries, since the monitoring of physicochemical and biological variables continuously allows identifying variations in pollution levels; this allows, at the same time, better criteria to evaluate the largest and better land use proposal in the respective sub-basins of the Izabal Lake and Rio Dulce through the Lake Authority. Based on bimonthly records of physicochemical and biological properties of the tributaries of the lake, during the years from 2005 to 2011, it was determined that the condition of N-NO₃- in the lake is considered desirable, in accordance with standards of the Conservation Agenda Lake. Logistics modeling did not establish significant temporary and special effect on N-NH₄⁺ and total phosphorus, however, it was established on dissolved oxygen and transparency although those are low quality models using the r² criterion. The response variables with correlation at 5% level were: Ni and Mn (0,731), suspended solids and Cr (0,7019), suspended solids and dissolved oxygen (-0,80), suspended solids and % saturation of dissolved oxygen (-0,791). Statistical models are determined using 5% significance for prediction of the conductivity, salinity, suspended solids and transparency.

Keywords : river basin management; water pollution; logistic regression; quality control.

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