Extractants
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. Separation of gadolinium and europium from chloride media by the solvent extraction technique
Abstract Obtaining rare earth elements (REE) is a complicated task, due mainly to the difficulty of separating and purifying them. Solvent extraction is the most widely used technique for separating REE, and the most common extractants used are organophosphorus acids. The low selectivity of this technique leads to the need for a high number of extraction cel
REM, Int. Eng. J.. Publicado em: 2020-03
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2. Copper use efficiency in soybean cultivars
Resumo: O objetivo deste trabalho foi avaliar o efeito da eficiência do uso de cobre em cultivares de soja, cultivadas em Argissolo típico com alto teor de matéria orgânica, sobre os atributos químicos do solo e a produção de grãos, o estado nutricional e os componentes fisiológicos das plantas. O experimento foi realizado em condições de casa de
Pesq. agropec. bras.. Publicado em: 25/11/2019
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3. COMPETING SOLVENT EXTRACTION OF CALCIUM AND/OR NICKEL WITH CYANEX 272 AND/OR D2EHPA
ABSTRACT The present study assessed the competing behavior between metals and extractants applied to the solvent extraction of calcium and/or nickel present in sulfuric solutions using the extractants Cyanex 272 (bis-2,4,4-trimethylpentyl phosphinic acid) and/or D2EHPA (di-2-ethylhexyl phosphoric acid). Tests were designed to allow equivalent competing condi
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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4. SEPARATION OF ZINC FROM MANGANESE BY SOLVENT EXTRACTION FROM ACIDIC LEACHATES OF SPENT ZINC-MnO2 DRY CELLS USING NEUTRAL ORGANOPHOSPHORUS EXTRACTANTS
This paper describes a route for recovering manganese and zinc from spent zinc-MnO2 dry cells via acid leaching using sulfuric or hydrochloric acids as leachants. Hydrogen peroxide was added as reductant. Experiments were run at 25-40 °C for 1-3 h. Under the best optimal conditions, over 97.5 wt.% of zinc and manganese were leached by both acids. Zn(II) was
Quím. Nova. Publicado em: 2018-07
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5. SYNERGIC EXTRACTION OF PANTOTHENIC ACID WITH TWO DIFFERENT EXTRACTANTS
Abstract The influences of extractants concentrations and solvent polarity on the efficiency of pantothenic acid separation by synergic extraction with tri-n-octylamine (TOA) and di(2-ethylhexyl) phosphoric acid (D2EHPA) mixture have been analyzed. The results indicated the formation of an interfacial compound which includes one molecule of pantothenic acid
Braz. J. Chem. Eng.. Publicado em: 2016-12
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6. Cadmium phytoavailability in soils and evaluation of extractant effectiveness using an isotope technique
Large areas of land are nowadays contaminated by heavy metals and, it is therefore, important to monitor their levels in soils. Vegetables act as transfer mechanisms of such contaminants from soils to higher levels in the food chain. In this study, we aimed to evaluate the effectiveness of chemical extractants by the L-value method for Cd phytoavailability u
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-10
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7. Disponibilidade de Cd em Latossolos e sua transferência e toxicidade para as culturas de alface, arroz e feijão / Cadmium availability in Oxisols and its transfer and toxicity to lettuce, rice and bean crops
O cádmio (Cd) é um elemento potencialmente tóxico para as plantas, animais e homens. O Cd é particularmente perigoso devido à sua mobilidade relativamente alta em solos e transferência para as plantas. Além disso, plantas que crescem em solos contaminados podem acumular Cd nos tecidos comestíveis em grandes quantidades sem qualquer sintoma visível d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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8. Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors
Neste estudo, extratores à base de amina (Alamine 336, Alamine 308, Alamine 304 e Aliquat 336) diluídos em querosene foram usados para extração de urânio e separação de outros elementos associados. Alamine 336 foi o melhor extrator para o processo de extração de urânio de soluções de sulfato quando comparado com outros reagentes à base de amina,
Journal of the Brazilian Chemical Society. Publicado em: 2012-07
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9. Comparison of Resin, Mehlich-1 and Mehlich-3 extractants for phosphorus, in Coastal Tableland soils.
2009
Aracaju: Embrapa Tabuleiros Costeiros. Publicado em: 2011
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10. Disponibilidade de micronutrientes em classes dominantes de solos do Trópico Úmido brasileiro. II. Manganês.
1984
Belém. Publicado em: 2011
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11. Evaluation of bioavailability of heavy metals in urban waste in solid for extractors in Brazil
The organic fraction of urban solid waste (USW) is around 60% of the total. The composting is a simple and efficient process to recycle this fraction of the USW, transforming it in organic fertilizer. The compounds of waste can contain a value assigned to aggregate economic potential of reuse of micronutrients (Cu, Ni and Zn) contained therein, in the produc
INTERNATIONAL ORBIT CONFERENCE. Publicado em: 2011
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12. Absorcao de metais pesados pelo azevem (Lolium multiflorum) em dois solos do estado do Rio Grande do Sul.
Com o objetivo de avaliar a absorcao de metais pesados para as plantas, foi instalado um experimento em vasos, ao ar livre, com dois solos podzolicos vermelho-amarelos do Rio Grande do Sul, nos quais foi plantado o azevem. Os metais pesados Ni, Pb, Cd, Zn e Cu, em dois niveis, foram adicionados aos solos no lodo procedente do sistema Integrado de Tratamento
Pesquisa Agropecuaria Brasileira. Publicado em: 2011