Browsing by Author "Ascar Estay, María Loreto"
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Ahumada Torres, Aída Inés de Lourdes; Gudenschwager Soruco, Orianne; Carrasco Rimassa, María Adriana; Castillo Morales, Gabriela; Ascar Estay, María Loreto; Richter Duk, Pablo (ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2009-06)The purpose of this study was assessing Cu and Zn availabilities in soils amended with a biosolid through the determination of their sequentially extracted chemical forms and their relationship with the contents of these ...
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Ahumada Torres, Aída Inés de Lourdes; Mendoza, Jorge; Ascar Estay, María Loreto (MARCEL DEKKER INC, 1999-01)Organic acids and phosphate were determined in soil aqueous extracts by capillary zone electrophoresis using indirect UV detection. The electrolyte system was 10 mM sodium benzoate with 0.5 mM tetradecyltrimetyl-ammonium ...
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Ahumada Torres, Aída Inés de Lourdes; Mendoza, Jorge; Escudero, Paula; Ascar Estay, María Loreto (MARCEL DEKKER INC, 2001)Some organic acids of low molecular weight, generated through breakdown of giant wastes or root exudation, increase the solubilization of heavy metals, such as cadmium (Cd) and copper (Cu) through complexation reactions ...
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Ahumada Torres, Aída Inés de Lourdes; Sepúlveda, Karen; Fernández, Priscilla; Ascar Estay, María Loreto; Pedraza, Cristina; Richter Duk, Pablo; Brown, Sally (Springer, 2014)Purpose This study assessed the effect of biosolid application on the bioavailable fraction of some trace elements (Cu, Cr, Ni, and Zn) using a bioassay with sunflower (Helianthus annuus) and a chemical assay, diffusion ...
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Ascar Estay, María Loreto; Ahumada Torres, Aída Inés de Lourdes; Richter Duk, Pablo (PERGAMON-ELSEVIER SCIENCE LTD, 2008-01)The effect of biosolid incorporation on arsenic distribution in Mollisol soils in central Chile was studied. Two soils were sequentially extracted for arsenic with a five-step method that accounts for the following arsenic ...
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Ahumada Torres, Aída Inés de Lourdes; Escudero, Paula; Ascar Estay, María Loreto; Mendoza, Jorge; Richter Duk, Pablo (MARCEL DEKKER INC, 2004-06)Copper (Cu) mining activities are very important in central Chile. The present study consists in determining the distribution and availability of copper, arsenic (As), and lead (Pb) in soils near a smelting facility, in ...
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Ascar Estay, María Loreto; Ahumada Torres, Aída Inés de Lourdes; Richter Duk, Pablo (PERGAMON-ELSEVIER SCIENCE LTD, 2008-08)A Study was done on the influence of redox potential on the mobility and availability of the various arsenic chemical forms in a Mollisol soil from central Chile amended with biosolid. Arsenic availability was strongly ...
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Ascar Estay, María Loreto; Ahumada Torres, Aída Inés de Lourdes; López, Alicia; Quintanilla, Francia; Leiva, Karla (Sociedade Brasileira de Química, 2013)Nonsteroidal anti-inflammatory drugs (NSAIDs) are a group of medications widely used by man to heal certain ailments. However, after consumption, they may be excreted in wastewaters with consequent environmental effects. ...
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Ahumada Torres, Aída Inés de Lourdes; Mendoza, Jorge; Navarrete, E.; Ascar Estay, María Loreto (MARCEL DEKKER INC, 1999-05)Different chemical forms of cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), lead (Pb), nickel (Ni), and zinc (Zn) were determined in agricultural soils cultivated with lettuce and celery. These soils have been ...
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Ahumada Torres, Aída Inés de Lourdes; Escudero, Paula; Carrasco Rimassa, María Adriana; Castillo, Gabriela; Ascar Estay, María Loreto; Fuentes Pérez, Edwar (ROYAL SOC CHEMISTRY, 2004)In Chile, the increasing number of plants for the treatment of wastewater has brought about an increase in the generation of sludge. One way of sludge disposal is its application on land; this, however involves some problems, ...