The reactions of gallium, indium and thallium with 2-(2-pyridylazo)-1-naphthol-4-sulphonic acid and their spectrophotometric determination

Voznica, Petr; Havel, Josef; Sommer, L.

doi:10.1135/cccc19800054

Cited by 38 publications

(14 citation statements)

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“…The absorbance vs. pH graphs for the Mg-QUIN system were interpreted using relations derived earlier by Sommer et al [15] and Idriss et al [16] and by the generalized approach described previously [17]. The following equilibria were assumed:…”

Section: Resultsmentioning

confidence: 99%

Use of Quinizarin as a Spectrophotometric Reagent for MgO Content Analysis of Portland Cement and Cement Clinker

Sedaira

Idriss

Seleim

et al. 1998

Monatshefte fuer Chemie

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A new direct spectrophotometric method for the determination of magnesium oxide in Portland cement and cement clinker is proposed. The method is based on a reaction with quinizarin (QUIN, 1,4-dihydroxyanthraquinone) in ethanol-water (50% v/v) solution at pH 9.5±10.3. Under optimum conditions, the determination of 0.5±3.9 mg Á ml À1 of magnesium is possible. The method is rapid and selective and possesses good accuracy and precision. The analysis of cement materials of variable magnesium content is feasible over the concentration range of 0.85±3.2 mg Á ml À1 Mg; the detection limit is 25.3 ng Á ml À1 Mg. Under the given conditions, no constituents normally present in Portland cement materials interfer. The procedure was tested by analyzing several standard reference materials and real samples of Portland cement and has been found to give satisfactory results. It has been satisfactorily applied to the determination of magnesium in clay and raw meal.

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Section: Resultsmentioning

confidence: 99%

Use of Quinizarin as a Spectrophotometric Reagent for MgO Content Analysis of Portland Cement and Cement Clinker

Sedaira

Idriss

Seleim

et al. 1998

Monatshefte fuer Chemie

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“…All graphs exhibit a similar descending branch above pH 6.5 which is due to the hydrolysis of the complexed Tz. The absorbance versus pH graphs for copper-Tz system at different temperatures were interpreted using relations derived earlier by Sommer et al [35], Idriss et al [36] [37] and Saleh et al [34]. The following Equations (3, 4) were valid for equimolar and solutions with an excess of metal ion respectively:…”

Section: Complexation Equilibria Of Cu(ii) With Tartrazine At Differementioning

confidence: 99%

Oxidation and Complexation-Based Spectrophotometric Methods for Sensitive Determination of Tartrazine E102 in Some Commercial Food Samples

Saleh¹,

Hashem²,

Salahi³

2016

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“…All the absorbance versus pH-graphs exhibit a similarly descending branch above pH 7.8, which is due to the hydrolysis of the complexed ligand, Fig. 2.The absorbance-pH graphs for solutions with an excess of one component or equimolar solutions, were analyzed by direct graphical and logarithmic analysis using transformations derived earlier by Sommer et al [22][23][24] ,and by the generalized approach described previously 25 . By considering the values of the dissociation constants of zincon under our experimental conditions, one can assume that the di-anionic form of the reagent (H 2 L 2-) is the prevalent ligand species in the pH range of complexation.…”

Section: Complexation Equilibria Of Nickel(ii) With Zinconmentioning

confidence: 99%

Spectrophotometric Studies on the Complexation Equilibria of Ni and Pb with 2‐Carboxy‐2‐Hydroxy‐5'‐Sulfo‐Formazylbenzene. Simultaneous Determination of Trace Amounts of Ni and Pb

Hashem¹,

Abu-Bakr²,

Hussain³

2004

Annali di Chimica

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Spectrophotometric studies have been made to investigate the reaction of Nickel and Lead with 2-carboxy-2'-hydroxy-5'-sulfoformazyl-benzene (zincon) in 50%(v/v) ethanol-water at 25 degrees C and an ionic strength of 0.1 M NaClO4. A complete picture of the complexation equilibria in the pH range (4.2-12.0) for nickel and (1.9-11.5) for lead are presented. Simple, rapid, selective and sensitive methods for the spectro-photometric determination of nickel and lead has been developed based on the color reaction of their complexes with zincon. The methods allow the determination of 4.69 microg mL(-1) of nickel at pH = 6.3 (lambdamax = 665 nm) and 10.3 microg ml(-1) of lead at pH = 5.6 (lambdamax = 610 nm). The apparent molar absorptivities were epsilon = 1.3 x 10(4) L mol(-1) cm(-1) for nickel and epsilon = 0.6 x 10(4) L mol(-1) cm(-1) for lead. The interference of a large number of foreign ions and complexing agents has been studied. Thiosulphate, as masking agent allows the simultaneous determination of nickel and lead in the presence of high concentrations of copper. Ascorbic acid, sodium cyanide and or sodium fluoride provide the elimination of many other interferences. The methods have been applied successfully to the simultaneous determination of nickel and lead in an aluminium and non-ferrous alloy.

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The reactions of gallium, indium and thallium with 2-(2-pyridylazo)-1-naphthol-4-sulphonic acid and their spectrophotometric determination

Cited by 38 publications

References 0 publications

Use of Quinizarin as a Spectrophotometric Reagent for MgO Content Analysis of Portland Cement and Cement Clinker

Use of Quinizarin as a Spectrophotometric Reagent for MgO Content Analysis of Portland Cement and Cement Clinker

Oxidation and Complexation-Based Spectrophotometric Methods for Sensitive Determination of Tartrazine E102 in Some Commercial Food Samples

Spectrophotometric Studies on the Complexation Equilibria of Ni and Pb with 2‐Carboxy‐2‐Hydroxy‐5'‐Sulfo‐Formazylbenzene. Simultaneous Determination of Trace Amounts of Ni and Pb

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