Physicochemical analysis of rainwater and suspended matter from Toluca city and Salazar, state of Mexico
by Beatriz Eugenia Lopez Munoz, Jose Luis Iturbe Garcia, Rafael Lopez Castanares, Oscar Olea Cardoso
International Journal of Environment and Pollution (IJEP), Vol. 26, No. 1/2/3, 2006

Abstract: Physicochemical analysis of rainwater collected from two sites in the State of Mexico, Toluca city and the Instituto Nacional de Investigaciones Nucleares (ININ) in Salazar, was carried out. The pH was measured twice at the sampling site and in the laboratory within five minutes following the sample opening. The SO42- was quantified by a turbidimetric method. The concentration of neutralising ions, Ca2+, Na+, Mg2+ and K+ among others, was measured by atomic absorption spectrometry. Ca2+ was found to contribute to the greatest extent in neutralising the rainwater acidity, between April and June, the first stage of rainfall. A sharp decrease of Ca2+ concentration occurs from June to the end of the year. At the same time, a lowering of pH was detected. The particulate matter was previously separated and semi-quantitatively analysed by scanning electron microscopy. The elemental composition of suspended solids consisted of C, Si, Al, Ca, S and others. Particles, ranging in size from some nm to hundreds of mm, were of two kinds: non-porous, which could be blown from soil into the atmosphere by wind action; and porous, whose main source might be the forest fires that occurred in 1998 around the Toluca Valley.

Online publication date: Thu, 02-Mar-2006

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