Relación entre 18O del agua y el contenido de NO3, como herramienta metodológica para analizar su concentración en un arroyo del sudeste bonaerense

CALVI, CAROLINA; MARTINEZ, DANIEL E.; DAPEÑA, CRISTINA

Revista Naturalia

Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco

Lugar: Comodoro Rivadavia; Año: 2016 vol. 8 p. 93 - 96

0327-5272

Nitrate pollution of surface water is a global problem producing human health andenvironmental consequences. The study area includes La Ballenera creek located in the SE ofthe Buenos Aires province. In this work a relationship is established between changes in 18Oand NO3 in superficial water. During 2013-2014 were taken 127 samples on the bridge overRoute 77 (SLBA) and 51 on the bridge over Route 11 (SLBB). Nitrate concentrations weremeasured in the range of 2 -79.6 mg/L. In winter-spring intervals (1 and 3), there are variablenitrate and cycles of 18O, which start from -5.5 ? in SLBA to more enriched values (-3 ?)in SLBB. In summer-autumn 2014 (2) in SLBA δ 18O values are close to -5.5 ? and NO3levels exceed 45 mg/L; while in SLBB δ18O values are more variable than in SLBA andnitrate average is 6 mg/L. The analogous δ18O value (-5.5 ?) of superficial water and theaquifer confirm the great influence of groundwater in that period in relation to 1 and 3.