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Deoxygenation of Vanadyl SchiflC’s Base Complexes : Conversion of Oxocation Complexes into Halogeno -derivatives

Pasquali, Marco; Torres-Filho, Afranio; Lorian, Carlof (Journal of the Chemical Society, Chemical Communications, 1975)
Diterpenoid furans from Pterodon species

Fascio, Miguel; Mors, W. B.; Gilbert, B.; Mahajan, J. R.; Monteiro, M. B.; Santos Filho, D. dos (Phytochemistry, 1976)

Investigation of diterpenoids in four species of Pterodon show varying oxidation patterns on the vinhaticane or vouacapane skeletons.
Dissociation and solubility variation versus pO2- of scheelite CaWO4 in molten NaCl−KCl (At 1000 K)

Combes, R.; Tremillon, B.; Andrade, F. de (Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1977)

The conditional solubility of scheelite CaWO 4 in molten NaCI--KC1 (1 : 1) has been studied either in oxobasic or oxoacidic media. In the former case it is increased by formation of sparingly soluble CaO according to: Ca ...
Kinetics and mechanism of Cu(II) catalysed oxidation of malic acid by the peroxydisulphate ion

Agarwal, S. C.; Chandra, G.; Jha, S. K. (Journal of Inorganic and Nuclear Chemistry, 1979)

Catalysis by copper (II) in peroxydisulphate oxidation has been reported for many systems[l-12]. Inmmcient kinetic data do not provide evidence for the mechanism of the catalytic action[13]. Kinetics of Cu(ll) catalysed ...
State-to-state reaction dynamics of HF(v = 2) with Sa and Sr

Torres-Filho, Afranio; Pruett, J. Gary (Journal of Chemical Physics, 1982)

HF gas molecules in 11 = 2 are produced in a beam-gas reaction system using an intracavity, multiply resonant HF chemical laser to consecutively pump HF(11 = 0) using the PI (4) and P2 (3) HF lasing lines. A beam of Ba ...
Chemistry and Structure of an Inorganic Analogue of a Carboxylic Acid: Hydroxobis (8-quinolinato) oxovanadium (V)

Giacomelli, Ambrogio; Floriani, Carlo; Duarte, Adalcindo Ofir de Souza; Chiesi-Villa, Angiola; Guastini, Carlo (Inorganic Chemistry, 1982)

Basic hydrolysis, under mild conditions, of (~-oxo)bis[bis(8-quinolinato)oxovanadium(V)], [(Q2VO)20]( Q = 8-quinolinato anion), obtained by a one-step synthesis, gave a dioxovanadium(V) complex, [Q2V02]-, containing the ...
Methodology for the determination of gaseous hydrogen peroxide in ambient air

Jacob, P.; Tavares, Tânia Mascarenhas; Klockow, D. (Fresenius' Zeitschrift für analytische Chemie, 1986)

A method for the determination of gaseous hydrogen peroxide in ambient air is described. The cryogenic sampling technique (-45~ employed represents an improvement compared with the impinger technique by diminishing ...
Chumbo e cádmio no sangue e estado nutricional de crianças, Bahia, Brasil

Carvalho, Fernando Martins; Silvany Neto, Annibal Muniz; Lima, Maria Engrácia Chaves; Tavares, Tânia Mascarenhas; Azaro, Maria da Graça Andrade; Quaglia, Gilca Maria Cardoso (1987)

Num estudo de prevalência foi estudada a relação entre níveis de chumbo (PbS) e de cádmio no sangue (CdS) e o estado nutricional de crianças de 1 a 9 anos de idade, residentes a menos de 900 metros de uma fundição primária ...
Application of the mussel watch concept in studies of hydrocarbons, PCBs and DDT in the Brazilian Bay of Todos os Santos (Bahia)

Tavares, Tânia Mascarenhas; Rocha, V. C.; Porte, C.; Barceló, D.; Albaigiés, J. (1988)

Data on aliphatic and aromatic hydrocarbons, PCBs, and DDT in different species of edible bivalves collected along the Todos os Santos Bay (Bahia, Brazil)are reported for the first time for the SW Atlantic coast. The species ...
Spectrophotometric determination of nickel in copper-base alloy with 2-(2-thiazoly lazo)-p -cresol

Ferreira, Sergio Luis Costa (Talanta, 1988)

spectrophotometric method for determination of nickel in copper-base alloy with 2-(2-thiaxolylaxo)-p-cresol (TAC) is described. The interferences of foreign ions can be eliminated by masking with a mixture of sodium tartrate ...
Atmospheric H2O2 field measurements in a tropical environment: Bahia, Brazil

Tavares, Tânia Mascarenhas; Jacob, P.; Campos, Vânia Palmeira; Klockow, D. (1990)

Concentrations of H202 in atmospheric gas and liquid phases were determined for the first time in the tropical Southern Hemisphere. Measurements were carried out in the Salvador area, Bahia, 13°S, 38 ° W) both at the seaside ...
2-(2-Thiazolylazo)-p-cresol (TAC) as a reagent for the spectrophotometric determination of indium(III)

Ferreira, Sergio Luis Costa; Costa, Antonio Celso Spinola; Andrade, H. A. S. (Microchemical Journal, 1991)

The reaction between indium(III) and the 2-(2-thiazolylazo)-p-cresol (TAC) in aqueous methanol media at apparent pH 5.0–6.0 results in an intensely colored complex which is stable for at least 2 h. The composition is 1:2 ...
Sequential determination of iron and titanium by flow-injection analysis

Barberino, Maria Goreth Matos de Andrade; Ferreira, Sergio Luis Costa; Santos, B. F.; Costa, Antonio Celso Spinola (Talanta, 1992)

flow-injection method has been developed for the sequential spectrophotometric determination of iron and titanium using 3,s dihydroxybenzoic acid as chromogenic reagent. The system involves the sequential measurement of ...
Adsorptive stripping voltammetric behaviour of copper complexes of some heterocyclic azo compounds

Farias, Pércio Augusto Mardini; Ferreira, Sergio Luis Costa; Ohara, Aniy K.; Bastos, Margarida Bethlem Rodrigues; Goulart, Mauricio Silveira (1992)

Controlled adsorptive accumulation of copper complexed with TAN, TAC, TAR and TAM (heterocyclic azo-compounds) on a static mercury drop electrode provides the basis for the direct stripping measurement of this element in ...
Simultaneous spectrophotometric determination of nickel and iron in copper-base alloy with bromo—PADAP

Costa, Antonio Celso Spinola; Ferreira, Sergio Luis Costa; Barberino, Maria Goreth Matos de Andrade; Lôbo, Ivon Pinheiro (1993)

The reaction of nickel (II) with Br—PADAP, in the presence of tergitol NPX surfactant, forms a complex with absorption peaks at 520 and 560 nm. The iron(II)—Br—PADAP system at the same conditions forms a chelate with ...
2-(2-Thiazolylazo)-p-Cresol (TAC) as a Reagent for the Spectrophotometric Determination of Titanium (IV)

Ferreira, Sergio Luis Costa; Costa, Antonio Celso Spinola; Andrade, Henrique A. S. (Mikrochim. Acta, 1993)

The reaction between titanium(IV) and 2-(2-thiazolylazo)-p-cresol- (TAC) in aqueous methanol media at apparent pH 4.0-5.6 results in a intensely coloured complex that is stable for at least 2 h. The combining ratio is 1 : ...
Adsorptive preconcentration for voltammetric measurements of trace levels of vanadium in the presence of copper

Farias, Pércio Augusto Mardini; Ohara, Aniy K.; Takase, Iracema; Ferreira, Sergio Luis Costa; Gold, Jon S. (1993)

An electrochemical stripping procedure for trace measurements of vanadium is described in which preconcentration is achieved by the adsorption of a vanadium-2-(2′-thiazolylaloz)-p-cresol complex on a static mercury drop ...
Cathodic adsorptive stripping voltammetry of nickel complexed with hydroxynaphthol blue at a static mercury drop electrode

Farias, Pércio Augusto Mardini; Ohara, Aniy K.; Takase, Iracema (1993)

A new method is described for the determination of Ni based on the cathodic adsorptive stripping of Ni(II) complexed with hydroxynaphthol blue (HNB) at a static mercury drop electrode. Optimal conditions were found to be: ...
Precipitation of polypropylene and of high-density polyethylene from stirred, binary solutions

Esperidião, Maria Cecília Azevedo; Galembeck, Fernando (1993)

The precipitation of polypropylene (PP) and of high-density polyethylene (HDPE) from decalin solutions, under stirring, yields two polymer-rich phases, one of which is globular and the other is fibrous. Infrared spectra, ...
Polypropylene-(high density polyethylene) precipitation from stirred solutions

Esperidião, Maria Cecília Azevedo; Galembeck, Fernando (1993)

The fast precipitation of mixtures of polypropylene (PP) with high density polyethylene (HDPE) from decalin solutions is affected by the stirring rate of the solutions. With fast stirring, two types of precipitates were ...

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