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	Provedor de dados Anais da ABC (AABC) (1) Scientia Agricola (1) Autor Abreu Jr.,Cassio Hamilton (1) Basavaiah,Kanakapura (1) Kumar,Urdigere R. Anil (1) Lavorante,André Fernando (1) Muraoka,Takashi (1) Ramakrishna,Veeraiah (1) Somashekar,Chikkaswamy (1) Mais... Palavra-chave Titrimetry (2) Aluminon (1) Bromate-bromide (1) Colorimetry (1) Dyes (1) Eriochrome cyanine R (1) FIA (1) Pharmaceuticals (1) Spectrophotometry (1) Stavudine determination (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2008 (1) 2003 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Exchangeable aluminum evaluation in acid soils Scientia Agricola Abreu Jr.,Cassio Hamilton; Muraoka,Takashi; Lavorante,André Fernando. One of the main factors limiting agricultural production in tropical climate regions is mainly related to the presence of exchangeable aluminum (Al3+) in highly weathered acid soils. Four methods of Al3+ determination extracted with neutral 1 mol L¹ KCl solution were evaluated: three colorimetric methods (aluminon plus ascorbic acid, and eriochrome cyanine R by FIA) and the usual titrimetric method with back-titration. Surface samples from 20 soils of different Brazilian regions, with active acidity (0.01 mol L¹ CaCl2 pH) ranging from very high to medium (3.82 to 5.52), were used. The variance analysis revealed significant interaction among Al3+ determination methods and soil. Mean methods comparisons within each soil (Tukey, P < 0.05) indicated that,... Tipo: Info:eu-repo/semantics/article Palavras-chave: FIA; Aluminon; Colorimetry; Eriochrome cyanine R; Titrimetry. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300020 Sensitive and rapid titrimetric and spectrophotometric methods for the determination of stavudine in pharmaceuticals using bromate-bromide and three dyes Anais da ABC (AABC) Basavaiah,Kanakapura; Ramakrishna,Veeraiah; Somashekar,Chikkaswamy; Kumar,Urdigere R. Anil. Four sensitive and rapid methods for the determination of stavudine (STV) in bulk drug and in dosage forms were developed and optimized. In titrimetry, aqueous solution of STV was treated with a known excess of bromate-bromide in HCl medium followed by estimation of unreacted bromine by iodometric back titration. Spectrophotometric methods involve the addition of a measured excess of bromate-bromide in HCl medium and subsequent estimation of the residual bromine by reacting with a fixed amount of methyl orange, indigocarmine or thymol blue followed by measurement of absorbance at 520 nm (method A), 610 nm (method B) or 550 nm (method C). In all the methods, the amount of bromate reacted corresponds to the amount of STV. Calculations in titrimetry were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Stavudine determination; Titrimetry; Spectrophotometry; Bromate-bromide; Dyes; Pharmaceuticals. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200003 Registros recuperados: 2 Primeira ... 1 ... Última

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