Results 11 to 20 of about 3,356 (197)

Eficiência de extratores de potássio disponível em solos do estado da Paraíba com graus de desenvolvimento pedogenético diferentes Efficiency of available potassium extractants in soils of Paraiba State with different degrees of pedogenetic development

Revista Brasileira de Ciência do Solo, 2010
A disponibilidade de potássio (K) às plantas depende dos teores das formas de K nos solos (K não trocável, K trocável e K solúvel), os quais variam com o grau de desenvolvimento pedogenético dos solos.
Jailma dos Santos de Medeiros, Fábio Henrique Tavares de Oliveira, Jandeilson Alves de Arruda, Montesquieu da Silva Vieira, Maurício Paulo Ferreira Fontes   +4 more
doaj   +1 more source

Influência da escória silicatada na acidez do solo e na produtividade de grãos do arroz de terras altas Influence of calcium silicate slag on soil acidity and upland rice grain yield

Ciência e Agrotecnologia, 2004
Apesar dos elevados teores de SiO2 total geralmente encontrados nos solos brasileiros, o teor na solução do solo pode ser baixo, em conseqüência do processo de dessilicificação que ocorre durante a intemperização dos solos.
Morel Pereira Barbosa Filho, Francisco José Pfeilsticker Zimmermann, Osmira Fátima da Silva   +2 more
doaj   +1 more source

Extractants Based on Coordinating Liquid Polar Solvents for Removal of Sulfur Compounds from Diesel Fuels

Applied Sciences, 2018
To remove sulfur-containing compounds (SCC) from the diesel fraction 200–360 °C extraction systems have been created based on coordinating organic solvents—dimethylformamide and dimethylsulfoxide, metal chlorides (CoCl2, CuCl2, CdCl2 ...
Natalia Stanislavovna Kobotaeva, Tatiana Sergeevna Skorokhodova, Oleg Semenovich Andrienko, Elena Ivanovna Marakina, Victor Ivanovich Sachkov   +4 more
doaj   +1 more source

To extract or not to extract? [PDF]

Journal of Dentofacial Anomalies and Orthodontics, 2015
Address for correspondence: sorelolivier@wanadoo.fr Our training in dental surgery or stomato­ logy has taught us everything we need to know about teeth: their life and works. We afford them care and protection and, as od­ ontologists, reorganization. Faced by the failure of long­term results for expansion, C.
openaire   +1 more source

Review on the Comparison of the Chemical Reactivity of Cyanex 272, Cyanex 301 and Cyanex 302 for Their Application to Metal Separation from Acid Media

Metals, 2020
Cyanex extractants, such as Cyanex 272, Cyanex 301, and Cyanex 302 have been commercialized and widely used in the extraction and separation of metal ions in hydrometallurgy.
Viet Nhan Hoa Nguyen, Thi Hong Nguyen, Man Seung Lee   +2 more
doaj   +1 more source

Avaliação da disponibilidade de manganês e ferro em solos pelo uso do método modificado da resina de troca iônica Evaluation of manganese and iron availability in soils by a modified ion exchange resin method

Revista Brasileira de Ciência do Solo, 2004
A avaliação do método modificado da resina de troca de íons para extração de Mn e Fe dos solos foi o objetivo desta pesquisa. Foram utilizadas 44 amostras de solo, cujos teores de Mn variaram de baixos a altos e de Fe de médios a altos.
C. A. Abreu, B. van Raij, M. F. Abreu, A. Paz Gonzalez   +3 more
doaj   +1 more source

Synthesis and properties of calix[4]arene telluropodant ethers as Ag+ selective sensors and Ag+, Hg2+ extractants

Beilstein Journal of Organic Chemistry, 2009
Three novel phenyltelluroalkoxyl functionalized tweezer-like calix[4]arenes 6–8 and two monophenyltelluropropoxyl functionalized calix[4]arenes 10 (cone conformer) and 12 (partial cone conformer) were synthesized and characterized.
Yang Lu, Yuanyuan Li, Song He, Yan Lu, Changying Liu, Xianshun Zeng, Langxing Chen   +6 more
doaj   +1 more source

Comparison of the effectiveness of three extractants in extracting potassium, calcium and magnesium from tropical peat soils [PDF]

Mires and Peat, 2021
Peat soils are frequently analysed using the same standard methods and extractants as for mineral soils, despite the distinctive nature of organic soils.
Ameera Abdul Reeza, Aminuddin Hussin, Osumanu Haruna Ahmed   +2 more
doaj   +1 more source

EXTRACT [PDF]

American Journal of Psychiatry
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De Forest, A. H., Butler,
openaire   +1 more source

Rediscovering Sodium Ionophores as Selective Agents for Lithium Recognition and Extraction

Angewandte Chemie, EarlyView.
Long‐classified sodium ionophores unexpectedly prefer lithium and act as efficient extractants in solid–liquid extraction (SLE). Readily prepared from catechol and haloacetamides, these hosts recover hydrated LiCl from multicomponent salt mixtures via a hydration‐assisted O···Li+ binding mode, enabling scalable lithium separation with Li/Na, Li/K, and ...
Jakub Narodowiec, Aleksandra Kazimierczak, Małgorzata Grela, Magdalena Ceborska, Magdalena Matczuk, Maja Morawiak, Kajetan Dąbrowa   +6 more
wiley   +2 more sources