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Comparison of H/Al stoichiometry of mineral and organic soils in Brazil Rev. Bras. Ciênc. Solo
Perez,Daniel Vidal; Anjos,Lúcia Helena Cunha dos; Ebeling,Adierson Gilvani; Pereira,Marcos Gervasio.
Exchangeable Al has been used as a criterion for the calculation of lime requirement in several Brazilian States. However, the laboratory method with extraction by a 1 mol L-1 KCl solution followed by indirect alkaline titration is not accurate for some Brazilian soils, mainly in the case of soils with high organic matter content. The objective of this study was therefore to evaluate the stoichiometry of H+/Al3+ in KCl soil extracts. The results suggested that organically complexed Al is the main contributor to exchangeable acidity in soils enriched with organic matter. Liming recommendations for organic soils based exclusively on exchangeable Al determined by the NaOH titration method should therefore be revised.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acid-base titration; ICP-OES; KCl; Histosols.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000400031
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Methods to Quantify Nickel in Soils and Plant Tissues Rev. Bras. Ciênc. Solo
Rodak,Bruna Wurr; Moraes,Milton Ferreira de; Pascoalino,João Augusto Lopes; Oliveira Junior,Adilson de; Castro,Cesar de; Pauletti,Volnei.
In comparison with other micronutrients, the levels of nickel (Ni) available in soils and plant tissues are very low, making quantification very difficult. The objective of this paper is to present optimized determination methods of Ni availability in soils by extractants and total content in plant tissues for routine commercial laboratory analyses. Samples of natural and agricultural soils were processed and analyzed by Mehlich-1 extraction and by DTPA. To quantify Ni in the plant tissues, samples were digested with nitric acid in a closed system in a microwave oven. The measurement was performed by inductively coupled plasma/optical emission spectrometry (ICP-OES). There was a positive and significant correlation between the levels of available Ni in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Micronutrient; Availability; Mehlich-1; DTPA; ICP-OES.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300788
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Caracterização farmacognóstica de Piper arboreum var. arboreum e P. tuberculatum (Piperaceae) Acta Amazonica
SILVA,Rolf Junior Ferreira; AGUIAR-DIAS,Ana Cristina Andrade de; FAIAL,Kelson do Carmo Freitas; MENDONÇA,Maria Sílvia de.
RESUMO Piper arboreum Aubl. var. arboreum e P. tuberculatum Jacq. (Piperaceae), conhecidas como pimenta-longa, são comercializadas como produtos tradicionais fitoterápicos e, frequentemente, identificadas erroneamente, não havendo relatos sobre controle de qualidade dessas espécies. O objetivo do trabalho foi preparar e caracterizar drogas vegetais foliares e caulinares dessas espécies para estabelecer-lhes parâmetros de autenticidade botânica e grau de pureza para o controle de qualidade. Foram utilizados métodos padrões para o preparo e análises estrutural e físico-química das drogas vegetais. São caracteres diagnósticos macroscópicos para distinguir as drogas vegetais íntegras: tamanho, forma, cor, sabor, textura, características da superfície de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pimenta-longa; Produtos tradicionais fitoterápicos; Farmacognosia; Metais tóxicos; ICP-OES.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000200195
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Some macro and trace elements in various tissues of Van fish variations according to gender and weight Arq. Bras. Med. Vet. Zootec.
Yeltekin,A.Ç.; Oğuz,A.R..
ABSTRACT Van fish is a fish that can live in soda water at pH 9-10. Van fishing area is a very important source of protein for the people. The variations in tissue metal levels according to gender and weight in Van fish (Alburnus tarichi, Güldenstadt 1814) were studied. This study was conducted for the first time in Van fish. Which it is very important for living organisms Calcium(Ca), magnesium(Mg), sodium(Na), potassium(K), cobalt(Co), chromium(Cr) and lithium(Li) elements levels in the muscle, liver, gill, gonad, and brain tissues of Van fish were investigated by using inductively-coupled plasma-optic emission spectroscopy (ICP-OES). The results were evaluated in two groups as macro-elements(Ca, Mg, Na, K) and trace-elements(Co, Cr, Li). Cobalt...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Van fish; ICP-OES; Macro elements; Trace elements; Van lake.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000100231
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