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RESUMEN Este articulo informa sobre la valoracion de la fitotoxicidad del Material Particulado Sedimentable (MPS) en la zona urbana del canton Cuenca. El MPS se recolecto en tres sitios de la zona urbana, mediante el metodo descrito en el Texto Unificado de Legislacion Ambiental Secundaria del Ministerio del Ambiente (TULASMA). Por el material particulado se realizo la determinacion de la concentracion de los componentes utilizando el analisis gravimetrico, la de los metales pesados por espectroscopia de absorcion atomica, y la de aniones por metodo adaptado de referencia EPA 300.1. Posteriormente se evaluo su fitotoxicidad en cuatro especies, mediante el bioensayo de germinacion y elongacion de raiz e hipocotilo, en semillas de Lactuca sativa, Brassica oleracea italica, Allium cepa y Raphanus sativus. En el bioensayo las semillas se expusieron a diferentes diluciones de la suspension acuosa de MPS. Los resultados muestran que el efecto de los MPS dependio de la concentracion y de la especie analizada, evidenciando diferentes grados de fitotoxicidad. Palabras clave: Fitotoxicidad, material particulado sedimentable, bioensayo. ABSTRACT This paper reports on the phytotoxicity of Sedimentable Particulate Material (acronym in Spanish: MPS) in the urban area of Cuenca. MPS was collected at three sites in the city of Cuenca applying the method described in the Unified Text of Secondary Environmental Legislation of the Ministry of Environment (acronym in Spanish: TULASMA). The concentration of components in the sedimentable particulates was measured using gravimetric analysis, atomic absorption spectroscopy for heavy metals, and a method adopted from the EPA 300.1 reference for anions. The phytotoxicity of MPS was evaluated in bioassays measuring respectively the germination, and the root and hypocotyl elongation of seeds of the following plants: Lactuca sativa, Brassica oleracea italica, Allium cepa, and Raphanus sativus. In the bioassay seeds were exposed to different dilutions of the aqueous suspension of MPS. Results clearly revealed that the effect is concentration and species dependent, showing different levels of phytotoxicity. Keywords: Phytotoxicity, sedimentable particulate material, bioassay.

Análisis preliminar de la fitotoxicidad del material particulado sedimentable de la zona urbana de Cuenca