Resumo

CALVI, Carolina; DAPENA, Cristina  e  MARTINEZ, Daniel E.. Present day background of nitrate as a methodology in the surface water - groundwater interaction applied in southeastern Buenos Aires province, Argentina. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.207, pp.288-296. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n207.72543.

Nitrate contamination of surface and groundwater is a global problem which is related to the intense agricultural activity. The high concentrations affect the waters quality and it turns out to be an important indicator of the human influence. In the phreatic aquifer in a plain basin in southeastern Buenos Aires province of Argentina, nitrate has values between 4 and 235 mg/L measured in October 2013 and 5.7-250 mg/L in July 2014. Respect to the values in surface water, were measured concentrations of 7-79, 6 mg/L during October 2013-July 2014 and 1-120 mg/L from July 2014 to April 2015. The present day background values found in the aquifer were calculated through a statistical analysis and compared to monitor their variations. Also, were calculated in the two periods the present day background superficial water to compare them with the aquifer. Based on the results, a new methodology is proposed to analyze the surface-groundwater linkage.

Palavras-chave : gaining creek; phreatic aquifer; contamination; fertilizer; nitrate leaching; nitrate monitoring.

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