Herramientas hidroquímicas e isotópicas para evaluar la infiltración de contaminantes procedentes de lixiviado de residuos en Mar del Plata

MARTÍNEZ,D. E.; DAPEÑA, C,; MASSONE, H,; PANARELLO, H.O.; FERRANTE, A.; VERA, M. DEL C.

Río Cuarto

Congreso; IV Congreso Hidrogeológico Argentino; 2005

Facultad de Ciencias Exactas, Físico-Químicas y Naturales de UNRC

AbstractThe results of a five years continuous sampling measuring physical-chemical parameters on the leachate coming from a landfilling area in Mar del Plata and groundwater samples from wells close to the pollution source are presented. The measured parameters are temperature, electrical conductivity, pH and the concentration of major ions and some minor ions, including trace metals. In this work the determination of environmental isotopes on leachate andgroundwater samples are added. The objective is to analyze what type of data is more profitable considering its representativity and costs to be applied in monitoring programs. Measurements related to the high saline content like electrical conductivity and chloride concentration showed to be the most convenient tools to follow the leachate infiltration impact. Nitrate concentration showed a continuous increasing trend, but the interpretation is not clear due to the existence of other pollution sources. The heavy metals concentrations usually don’t exceed the background values. Stable isotopes show that leachate is on the meteoric line and groundwater samples from wells probably affected by infiltration are located near to leachate. The leachate has relatively high tritium values, with a good correlation against Cl- concentration.Keywords: Leachate, Mar del Plata, contamination, isotopes, landfill.