Andrea C. Montenegro

Colombian Corporation for Agricultural Research - AGROSAVIA

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José A. Olabe

Fundación Ciencias Exactas y Naturales

Sara E. Bari

University of Buenos Aires

V. T. Amorebieta

National University of Mar del Plata

Cesar A. Vargas-García

Colombian Corporation for Agricultural Research - AGROSAVIA

Viviana Marcela Varón‐Ramírez

Colombian Corporation for Agricultural Research - AGROSAVIA

Diego A. Delgadillo-Duran

Colombian Corporation for Agricultural Research - AGROSAVIA

Paula H. Reyes‐Herrera

Colombian Corporation for Agricultural Research - AGROSAVIA

Raúl S. Lavado

University of Buenos Aires

Diego F. Martín

University of Buenos Aires

Leonardo D. Slep

Instituto de Química y Fisicoquímica Biológicas

Cooperative Institutions

Colombian Corporation for Agricultural Research - AGROSAVIA

University of Buenos Aires

Consejo Nacional de Investigaciones Científicas y Técnicas

Fundación Ciencias Exactas y Naturales

Universidad Nacional de Colombia

Instituto de Química y Fisicoquímica Biológicas

Institute of Astronomy and Space Physics

National University of Mar del Plata

University of Stuttgart

Comisión Nacional de Energía Atómica

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Three Redox States of Nitrosyl: NO+, NO., and NO−/HNO Interconvert Reversibly on the Same Pentacyanoferrate(II) Platform

Angewandte Chemie (2009)

Andrea C. Montenegro V. T. Amorebieta Leonardo D. Slep Diego F. Martín Federico Roncaroli

Abstract [Fe II (CN) 5 (HNO)] 3− , ein Produkt der Zwei‐Elektronen‐Reduktion von Nitroprussid (siehe Schema), wurde spektroskopisch charakterisiert. Der Komplex ist in wässriger Lösung bei pH 6 stabil und zersetzt sich nur langsam zu [Fe(CN) 6 ] 4− und N 2 O. Bei steigendem pH‐Wert wird er unter Oxidation von NO − zu [Fe II (CN) 5 (NO)] 3− deprotoniert. [Fe II (CN) 5 (HNO)] 3− ist der erste Nichthäm‐Eisennitroxylkomplex mit reversibler Redoxaktivität unter physiologischen Bedingungen. magnified image

10.1002/ange.200806229

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Citations (9)

NIR spectroscopy and color measurements can be used to determine different characteristics of fermented cocoa beans

Journal of Food Nutrition and Population Health (2018)

Ana M Calvo Andrea C. Montenegro García Mc

Source

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Estado del cultivo de cacao en La Cordillera nariñense con énfasis en la concentración de cadmio

Corporación Colombiana de Investigación Agropecuaria (Agrosavia) eBooks (2023)

Diego Hernán Meneses-Buitrago José Libardo Lerma Lasso Gissela Fernanda Guerrero Díaz Diego Leonardo Cortés Delgadillo Eliana Martínez Pachón

El cacao es un importante producto de exportación para varios países de América del Sur (Brasil, Colombia, Ecuador, Perú y Venezuela). Dentro de ellos, Colombia ocupa el quinto lugar en producción y cuenta actualmente con el reconocimiento de la International Cocoa Organization (ICCO) por producir un cacao fino y de aroma. La producción de cacao en La Cordillera nariñense se da en diferentes zonas de vida con una amplia gama de ambientes agroecológicos, donde el cacao se adapta de forma diferencial. Esto implica adoptar prácticas adecuadas para la sostenibilidad de este cultivo en distintas áreas de la región, sin perder de vista los altos requerimientos de calidad e inocuidad exigidos por los mercados internacionales. En este sentido, la presencia de elementos como el cadmio constituye un problema de salud pública que amenaza la inocuidad del cacao y sus derivados. También es un factor importante a la hora de comercializar hacia países con normatividades exigentes que regulan y restringen los niveles de este contaminante. Por todo lo expuesto anteriormente, Agrosavia y la Fundación Ayuda en Acción, presentan en este manual las características de producción del cacao y abordan la presencia de este metal pesado con el fin de mejorar la sostenibilidad de este cultivo en la región y promover su comercialización.

10.21930/agrosavia.manual.7406177

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Copper Speciation in Soil: Time Evolution and Effect of Clay Amendment

Water Air & Soil Pollution (2015)

Andrea C. Montenegro Gisele V. Ferreyroa María E. Parolo Mabel Tudino Raúl S. Lavado

Bentonite

Amendment

Genetic algorithm

Fraction (chemistry)

10.1007/s11270-015-2569-1

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Citations (18)

Catalytic oxidation of hydroxyurea to bound NO+/NO2- mediated by pentacyano(L)ferrates. Characterization of the nitroxide radical, bound C-nitrosoformamide and NO as reaction intermediates

Inorganica Chimica Acta (2011)

Andrea C. Montenegro Sergio G. Dabrowski María M. Gutiérrez V. T. Amorebieta Sara E. Bari

Oxidizing agent

10.1016/j.ica.2011.02.051

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Citations (4)

Vis–NIR spectroscopy and machine learning methods to diagnose chemical properties in Colombian sugarcane soils

Geoderma Regional (2022)

Diego A. Delgadillo-Duran Cesar A. Vargas-García Viviana Marcela Varón‐Ramírez Francisco Calderón Andrea C. Montenegro

Soil test

Lasso

10.1016/j.geodrs.2022.e00588

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Citations (7)

Pesticide residues on lettuce (Lactuca sativa L.) in Cundinamarca-Colombia

Food Additives and Contaminants Part B (2023)

Edwin Samir Barbosa Ángel Julio Ricardo Galindo Pacheco Jeannette Amparo Español Aragón Diana Marcela Monroy Cárdenas Andrea C. Montenegro

Lettuce is Colombia's most widely cultivated leafy vegetable, but in the absence of good agricultural practices, there is the risk of some pesticide residues that affect its safety and quality. This work aimed to identify the pesticides used by farmers for the lettuce crop, the iceberg variety (Lactuca sativa var. capitata), in some municipalities of Cundinamarca (Colombia) and to investigate their residues by sampling and analysis. The farmers reported in the survey 44 active ingredients, most fungicides (54%), while the laboratory analysis showed 23 chemical compounds (52% insecticides, 39% fungicides and 9% herbicides). In addition, dithiocarbamates, procymidone and some organophosphates were among the active ingredients that exceeded the maximum residue limits (MRLs). About 80% of the identified pesticides were not registered with the regulatory entity Instituto Colombiano Agropecuario (ICA) for their use in lettuce, but some were in commercial products legally registered in Latin American and Caribbean countries.

Procymidone

Capitata

Leafy vegetables

10.1080/19393210.2023.2212635

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Citations (3)

ChemInform Abstract: Three Redox States of Nitrosyl: NO⁺, NO^·, and NO^‐/HNO Interconvert Reversibly on the Same Pentacyanoferrate(II) Platform.

ChemInform (2009)

Andrea C. Montenegro V. T. Amorebieta Leonardo D. Slep Diego F. Martín Federico Roncaroli

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.200932009

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Using vis-NIRS and machine learning methods to diagnose sugarcane soil chemical properties.

Diego A. Delgadillo-Duran Cesar A. Vargas-García Viviana Marcela Varón‐Ramírez Francisco Calderón Andrea C. Montenegro

Using vis-NIRS and machine learning methods to diagnose sugarcane soil chemical properties. Abstract Knowing chemical soil properties might be determinant in crop management and total yield production. Traditional soil properties estimation approaches are time-consuming and require complex lab setups, refraining farmers from promptly taking steps towards optimal practices in their crops. Soil properties estimation from its spectral signals, vis-NIRS, emerged as a low-cost, non-invasive, and non-destructive alternative. Current approaches use mathematical and statistical techniques, avoiding machine learning frameworks. This proposal uses vis-NIRS in sugarcane soils and machine learning techniques such as three regression and six classification methods. The scope is to assess performance in predicting and inferring categories of common soil properties (pH, soil organic matter OM, Ca, Na, K, and Mg), evaluated by the most common metrics. We use regression to estimate properties and classification to assess soil property status. In both cases, we achieved comparable performance on similar setups reported in the literature for property estimation for pH(R2=0.8, ρ=0.89), OM(R2=0.37, ρ=0.63), Ca(R2=0.54, ρ=0.74), Mg(R2=0.44, ρ=0.66) in the validation set. Open preprint This article is a preprint and has not been peer reviewed

Scope (computer science)

10.31220/agrirxiv.2020.00028

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Citations (1)

Modelling proton and metal binding to humic substances with the NICA–EPN model

Environmental Chemistry (2014)

Andrea C. Montenegro Silvia Orsetti Fernando V. Molina

Environmental context The toxicity of metals in the environment is greatly influenced by natural organic matter owing to its ability to bind metals to form complexes that can be immobile and non-bioavailable. Sound mathematical models are important to reliably predict the behaviour of such contaminants, and how they are affected by organic matter and other environmental colloids. Here a new model is discussed and compared with precedent ones. Abstract The mathematical modelling of metal cation–natural organic matter interactions is a fundamental tool in predicting the state and fate of pollutants in the environment. In this work, the binding of protons and metal cations to humic substances is modelled applying the Elastic Polyelectrolyte Network (EPN) electrostatic model with the Non-Ideal Competitive Adsorption (NICA) isotherm as the intrinsic part (NICA–EPN model). Literature data of proton and metal binding to humic substances at different pH and ionic strength values are analysed, discussing in depth the model predictions. The NICA–EPN model is found to describe well these phenomena. The electrostatic contribution to the Gibbs free energy of adsorbate–humic interaction in the EPN model is lower than that predicted by the Donnan phase model; the intrinsic mean binding constants for protons and metal cations are generally higher, closer to independent estimations and to the range of acid–base and complexation equilibrium values for common carboxylic acids. The results for metal cations are consistent with recent literature findings. The model predicts shrinking of the humic particles with increased metal binding, as a consequence of net charge decrease.

10.1071/en13214

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Citations (8)