Examinando por Autor "Cajas Regal, Diana Rebeca"

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    Determinación de plomo, cadmio y manganeso en sedimentos de hojas de Sauce "Salix alba" en las avenidas Abancay y Tacna, Lima – Noviembre 2014–enero 2015
    (Universidad Privada Norbert Wiener, 2015) Cajas Regal, Diana Rebeca; Evangelista Doria, Luisa Celina; Churango Valdez, Javier
    The concentration of lead, cadmium, and manganese was determined in leaf sediments of Salix alba (willow) collected from Tacna and Abancay avenues between November 2014 and January 2015. A total of 86 samples were analyzed, 44 from Abancay Avenue and 42 from Tacna Avenue, using flame atomic absorption spectrophotometry. The results for lead and cadmium were compared with the Environmental Quality Standards for soils (ECAS 2013) in Peru and with U.S. EPA standards (USEPA 2002). Manganese levels were compared with the reference values of the Agency for Toxic Substances and Disease Registry (ATSDR 2012). Findings showed that 95% of samples from Abancay Avenue and 100% from Tacna Avenue exceeded the Peruvian permissible limits for lead in residential/park soils. For cadmium, 100% of Abancay samples were above the standard. Compared with U.S. EPA human health risk levels, 18% of Abancay and 10% of Tacna samples exceeded the limits. No manganese sample surpassed the values established by ATSDR. It is therefore recommended to continue urban tree-cleaning programs, as they help reduce environmental contamination by heavy metals.