Se evaluó la calidad del agua de seis manantiales que abastecen de agua potable y riego agrícola a la comunidad El Platanal, en Michoacán. Se realizaron dos campañas de colecta, (estiaje y precipitación pluvial). Se evaluaron parámetros fisicoquímicos, microbiológicos y elementos traza. El tipo de agua predominante en la zona fue Ca2+-HCO3-. Se encontraron concentraciones de Fe (0.8 mg/L) superiores a los límites máximos permisibles por las normas mexicanas para agua potable. El sitio (S6) presentó las concentraciones más elevadas de algunos parámetros (NO3-, PO43-, coliformes fecales). El cálculo del Índice de Calidad del Agua (ICA) mostró que el agua en el área de estudio no es apta para uso potable, pero sí para riego agrícola.
This work is a study of the inter-relationship between parameters that principally affect the metal up-take in the plant. The relationships between the concentration of metal in the growth medium, C s , the concentration of metal absorbed by the plant, C p , and the total biomass achieved, M, all of which are factors relevant to the efficiency of phytoremediation of the plant, have been investigated via the macro-physiological response of Brassica juncea seedlings to Ni(II) stress. The factorial growth experiments treated the Ni(II) concentration in the agar gel and the diurnal light quanta (DLQ) as independently variable parameters. Observations included the evidence of light enhancement of Ni toxicity at the root as well as at the whole plant level, the shoot mass index as a possible indicator of shoot metal sequestration in B. juncea, the logarithmic variation of C p with C s and the powerlaw dependence of M on C p . The sum total of these observations indicates that for the metal accumulator B. juncea with regard to its capacity to accumulate Ni, the overall metabolic nature of the plant is important -neither rapid biomass increase nor a high metal concentration capability favor the removal of high metal mass from the medium, but rather the plant with the moderate photosynthetically driven biomass growth and moderate metal concentrations demonstrated the ability to remove the maximum mass of metal from the medium. The implications of these observations in the context of the perceived need in phytoremediation engineering to maximize C p and M simultaneously in the same plant, are discussed.
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