Felipe Yunta

Universidad Autónoma de Madrid | UAM · Department of Agricultural Chemistry

Fe and Mn (hydr)oxides are widely used as contaminant sorbents in water/wastewater systems but their potential use as micronutrient fertilizers is still poorly known. In this research, four nano-metal (hydr)oxides (amorphous Mn oxide (AMO), Fe-Mn binary oxide (FMBO), two-line ferrihydrite (2L-Fh) and goethite) were successfully synthesized and comp...

Tetracycline (TC) is among the most used antibiotics in animal feedstock in the EU. Antibiotics' persistence as emerging pollutants in the environment is evidenced by their long half-life in residual organic-mineral sediments and waters. The risk associated with this persistence favours antibiotic-resistant microbiota, affecting human health and ec...

The antibiotic tetracycline, is considered a contaminant of emerging concern due to its presence in wastewater effluents, surface waters and groundwaters. Adsorption of tetracycline on soils and clays has been extensively studied to remove the contaminant from the water. A decreasing adsorption as the pH increases is normally reported in the pH ran...

The present research was aimed to (i) report the recycling of spent A. bisporus substrate (SAS) to remove heavy metals (Cd and Pb) and phenanthrene (Phe) from polluted water and (ii) assess the possibility to use the treated water for irrigation. Batch experiments were carried out to assess, firstly, the effect of interaction time between pollutant...

Vegetation indices obtained from radiometric measurements have been used to estimate the stress response of plants grown in contaminated sites. The phytotoxicity of Pb and Zn in Festuca rubra L. and Vulpia myuros L. plants grown under hydroponic conditions was evaluated using vegetation indices obtained from radiometric measurements. The plants wer...

The aim of this work was to assess the impact of soil characteristics and constituents in the total extraction of hydrophobic organic pollutants, such as polycyclic aromatic hydrocarbons (PAH), in real polluted soil samples from different sources. Soil samples were obtained from a wood creosote treatment plant, in the vicinity of a metallurgy indus...

This study investigates the effect of three spent Agaricus bisporus substrate (SAS) application methods on bioremediation of soil multi-polluted with Pb and PAH from close to a shooting range with respect natural attenuation (SM). The remediation treatments involve (i) use of sterilized SAS to biostimulate the inherent soil microbiota (SSAS) and tw...

Different applications of spent Agaricus bisporus substrate (SAS), awidespread agro-industrial waste, were investigated with respect to the remediation of a historically polluted soil with Polycyclic Aromatic Hydrocarbons (PAH). In one treatment, the waste was sterilized (SSAS) prior to its application in order to assess its ability to biostimulate...

Background and AimsThe present study investigated the effectiveness of bovine blood (BB)-based products, compared with that of the widely used iron ethylenediaminedi-(2-hydroxyphenylacetic) acid (Fe-EDDHA) synthetic chelate, in iron nutrition of grapevine graft combinations and rootstocks grown under different controlled conditions.Methods and Resu...

An original methodological procedure was validated in order to quantify the potential of Medicago sativa culture to be used for polycyclic aromatic hydrocarbons (PAH) phytoremediation. A new device based in isolation of two-compartment root-shoot was developed. Washed quarz sand was spiked with an acetone solution of fluorene (Flu), phenanthrene (P...

Prevention of iron chlorosis with Fe synthetic chelates is a widespread agronomical practice but implies high costs and environmental risks. Blood meal is one of the main fertilizers allowed to be used in organic farming. Through this work a novel blood meal fertilizer was audited. Measurements such as FTIR, Raman, Electron Paramagnetic Resonance a...

Iron (Fe) is essential for chlorophyll formation and plant growth. Irondeficiency chlorosis is a major nutritional disorder in several fruit trees cultivated in calcareous and alkaline soils, reducing fruit yield and quality and causing heavy economic losses. Since chelated Fe, the most widespread fertilizers used for preventing or curing Fe defici...

Polycyclic aromatic hydrocarbons (PAH) are a family of compounds classified as persistent organic pollutants, which are hazardous for environmental and human health. White rot fungi are organisms that are able to remediate PAH from polluted soils. Spent mushroom compost (SMC) is employed for soil bioremediation and environmental research. In this s...

Iron (Fe) chlorosis is a widespread nutritional disorder in grapevine, particularly in vineyards developed on calcareous soils. Despite the effective application of highly efficient Fe chelates such as Fe–ethylenediamine di-o-hydroxyphenylacetic acid (EDDHA) to the soil to solve the problem, the cost of the treatments and the loss of effectiveness...

Synthetic chelates such as ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid) (EDDHA) have shown their efficacy in correcting iron (Fe) chlorosis on crops grown on calcareous soils. Several parameters, such as Fe concentration, soil and plant analyzer development (SPAD) index, yield, and fruit size, have been previously described to evaluate thei...

Polyaminocarboxylate and polyaminophenolcarboxylate chelating agents, of which EDTA and o,o-EDDHA are the most representative, are being profusely studied by our research team for 25 years due to their importance as micronutrient fertilizers used to correct nutritional disorders, and based on their level of impact on crop yields in Mediterranean re...

The o,oEDDHA/Fe is the most common and effective iron chelate used as fertilizer in calcareous soils. Several authors have reported that the anionic o,oEDDHA/Fe complex is adsorbed to soil components such as ferrihydrite. The bicarbonate anion may be a competing ion for this sorption, however no studies have yet identified the extent and mechanism...

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento Química Agrícola, Geología y Geoquímica, Fecha de lectura 18-07-2003

Reduced tillage with appropriate crop rotation could increase the viability of dry land agriculture in semiarid zones. The effects of tillage and crop rotation on soil physico-chemical properties, soil organic carbon (SOC) and N have been studied widely in long and short-term experiments. However, their effects on nutrient levels and fertility loss...

The Fe chelate o,p-EDDHA/Fe3+, in addition to o,o-EDDHA/Fe3+, was found recently to be a component of commercial EDDHA/Fe3+ chelates. The European Regulation on fertilisers has included o,p-EDDHA as an authorized chelating agent. The efficacy of o,o-EDDHA/Fe3+, o,p-EDDHA/Fe3+ and EDTA/Fe3+ chelates as Fe sources in plant nutrition was studied. Iron...

O,oEDDHA/Fe³⁺ and its analogues (o,oEDDHMA/Fe³⁺, EDDHSA/Fe³⁺) are chosen as the main iron chelates used to correct iron chlorosis in crops grown in calcareous and alkaline soils. In order to test new chelating agents, prior to their application, theoretical modeling using the speciation program MINTEQA2 is proposed. Also interaction tests between t...

The most effective remedy for iron deficiency is the use of synthetic iron chelates, specifically chelates derived from polyaminecarboxylic acids as EDDHSA (N,N'-ethylenediamine-di-(2-hidroxy-5-sulfophenylacetic) acid). A gradient ion-pair chromatographic method was developed to quantify the total amount of chelated iron in EDDHSA/Fe3+ fertilizers....

The effect of the length and the structure of the tether on the chelating ability of EDDHA-like chelates have not been established. In this work, PDDHA (propylenediamine-N,N'-bis(o-hydroxyphenyl)acetic acid), BDDHA (butylenediamine-N,N'-bis(o-hydroxyphenyl)acetic acid) and XDDHA (p-xylylenediamine-N,N'-bis(o-hydroxyphenyl)acetic acid) have been obt...

EDDHA and other structurally related chelating agents have been synthesized by a new synthetic pathway, and their chemical behavior was studied in order to predict the effect of the substituents in the benzene ring on their efficacy as iron fertilizers. The proposed synthesis produces chelating agents of high purity. All compounds studied, with exc...

Iron chelates analogous to ethylenediamino‐di(o‐hydroxyphenyl)acetic acid (EDDHA) are the fertilizers chosen to treat iron chlorosis of crops grown on calcareous soils. Characterization of these synthetic ligands should be made to establish their chemical behavior and efficiency as chlorosis correctors. The aim of this research was to develop an ap...

A collaborative assay among three laboratories was made in order to compare both the ion (CEN. EN 13368‐2:2001 E. Determination of chelating agents in fertilizers by ion chromatography. Part 2: EDDHA and EDDHMA, 2001a) and the ion‐pair (Lucena, J.J.; Barak, P.; Hernandez‐Apaolaza, L. Isocratic ion‐pair high‐performance liquid chromatographic method...

The presence of ethylenediamine-N-(o-hydroxyphenylacetic)-N'-(p-hydroxyphenylacetic) acid (o,p-EDDHA) as the second largest component in commercial EDDHA iron chelates has recently been demonstrated. Here is reported the speciation of o,p-EDDHA by the application of a novel methodology through the determination of the complexing capacity, protonati...

Ethylenediamine-N,N'bis(o-hydroxyphenyl)acetic acid (o,o-EDDHA) is one of the most efficient iron chelates employed to relieve iron chlorosis in plants. However, the presence of positional isomers of EDDHA in commercial iron chelates has been recently demonstrated, and among them, it has been claimed that ethylenediamine-N(o-hydroxyphenylacetic)-N'...

The ferric chelate reductase activities of leaf plasma membranes isolated from the leaves of Fe-deficient and Fe-sufficient sugar beet have been characterized. Substrates used were the complexes of ferric iron with ethylene diamine tetraacetic acid, citric acid and malic acid. Iron deficiency was associated with 1.5- to 2-fold increases in leaf pla...