Determinación de la concentración de plomo en rye grass del sector de Racar afectados por partículas provenientes de la elaboración de tejas

Abstract

The anthropogenic activities of production of tiles and bricks, have affected various locations in the Racar of the city of Cuenca, not only the crops, but also the health of the residents of the sector, for this reason the present project proposed as Aim to investigate the presence and bio accumulation of Lead in Rye Grass (Lolium perenne), a heavy metal of a toxic nature for humans, in addition to its environmental impact, the product of burning glazed tiles with Lead Oxide and Silica. The study covered an area of 2,42 ha, using the bio indicator, a species native to the aforementioned sector. To cover the study area, 20 grass samples were taken, applying systematic sampling at each of the delimited points. Prior to reading the results, the samples were digested by acid attack using Nitric Acid and Oxygenated Water, decomposing the organic matter of the sample to be analyzed in an acid medium. The digested samples were analyzed under duplicity applying the Atomic Absorption Spectrometry reading method, the results indicated the presence of Lead in the pasture, where the average concentrations are 5,04 mg Lead / kg, being 22,47 mg Pb / kg the highest concentration value recorded. These values exceed the limits defined in the European Union and Codex Alimentarius regulations that establish values of 0,10 and 0,30 mg Pb / kg of dry weight in vegetables respectively.