Spectrophotometric determination of thallium after its extraction as an ion-pair of the chloro-complex and pyronine G

Namboothiri, K.Krishnan; Balasubramanian, N.; Ramakrishna, T. V.

doi:10.1016/0039-9140(91)80277-7

Cited by 20 publications

(14 citation statements)

References 3 publications

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“…The availability of the spectrophotometric apparatus and the simplicity of the analytical procedures make the technique very attractive for a wide range of applications. Several reagents (2-(2-benzothiazolylazo)-2-p-cresol (BTAC), 4 iodoacetic acid and hexamethylenetetramine, 5 Brilliant Green, 6 Pyronine G 7 and Alizarin Violet 14 are examples) have been employed for the spectrophotometric determination of Tl(III). However, the common limitation of these reagents are poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

Abou‐El‐Sherbini

Mostafa

Hassanien³

2003

ANAL. SCI.

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A new sensitive chromogenic reagent, 9,10-phenanthaquinone monoethylthiosemicarbazone (PET), has been synthesized and used in the spectrophotometric determination of Tl(III). In HNO3, H2SO4 or H3PO4 acids, PET can react immediately at room temperature with Tl(III) to form a red 2:1 complex with a maximum absorption at 516 nm. The different analytical parameters affecting the extraction and determination processes have been examined. The calibration curve was found to be linear over the range 0.2 -10 µg cm -3 with a molar absorptivity of 2.2 × 10 4 dm 3 mol -1 cm -1 . Sandell's sensitivity was found to be 0.0093 µg cm -2 . No interference from macroamounts of foreign ions was detected, except for Pd(II). However, Pd(II) does not affect the determination process, because its complex with PET has its λmax at 625 nm. The proposed method has been applied to the determination of Tl(I and III) in synthetic and natural samples after separation by flotation (in oleic acid/kerosene) and solid-phase extraction (on polyurethane foam) techniques. The two methods were found to be accurate and not subject to random error, but solid-phase extraction was preferred because it is cheap, simpler and there is no contamination risk coming from flotation reagents.

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Section: Introductionmentioning

confidence: 99%

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

Abou‐El‐Sherbini

Mostafa

Hassanien³

2003

ANAL. SCI.

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“…A known amount of finely ground standard samples (rock, granite) was opened out by repeatedly heating with concentrated nitric acid and hydrogenflouride. 9,26 The mixture was heated with 2 ml of 5 M sulfuric acid and evaporated to fumes of sulfur trioxide. The residue was leached with water, filtered and diluted up to a known volume after heating it with a 5% citrate solution.…”

Section: Application Of the Methods Determination Of Thallium In Alloysmentioning

confidence: 99%

“…However, these methods are time consuming and also have the disadvantage of high blank values. Some of the other chromogenic reagents proposed for the determination of thallium are iodoacetic acid and hexamethylenetetramine, 8 Pyronine G, 9 Brilliant Green, 10,11 mepazine hydrochloride, 12 Bromopyrogallol Red, 13 the azo compounds of benzimidazole, 14 Alizarin Violet, 15 Phenosafranine. 16 Though the methods containing these reagents are sensitive, lack selectivity and suffer from serious interference of foreign ions, which normally occurs in the determination of thallium(III).…”

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confidence: 99%

A Simple and Rapid Spectrophotometric Determination of Thallium(III) with Trifluoperazine Hydrochloride

Revanasiddappa

Kumar

2002

ANAL. SCI.

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“…17,18 The mixture was treated with 2 ml of 5 M sulfuric acid and evaporated to fumes of sulfur trioxide. The residue was leached with water, filtered, and diluted up to a known volume after treating it with a 5% citrate solution or 0.05 1276 ANALYTICAL SCIENCES NOVEMBER 2002, VOL.…”

Section: Determination Of Cerium In Rock Samplesmentioning

confidence: 99%

Spectrophotometric Determination of Cerium with Leuco Xylene Cyanol FF

Revanasiddappa

Kumar

2002

ANAL. SCI.

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Cerium is traditionally referred to as one of the "rare earths", but is in fact more plentiful in the earth's crust than many other elements, including lead. 1,2 It is also the most widely distributed of the "rare earths", averaging 22 ppm in the earth's crust. 3 Cerium is industrially important and is used in nuclear reactors; in alloys with nickel and chromium; and in microwave devices, lasers, masers, and in television sets. 1,2 Cerium is also used in agriculture, forestry and animal husbandry, and much attention is now being paid to the study of cerium in the environment. 4 The cerium content of seawater is of the order of 0.0015 ppb; 5 in the edible portions of oysters and clams it has been known to concentrate to levels 100-times and 1000-times higher, respectively, than in seawater. 6 Inhalation exposures of cerium in humans have been known to cause sensitivity to heat, itching, and an increased awareness of odor and taste.

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Spectrophotometric determination of thallium after its extraction as an ion-pair of the chloro-complex and pyronine G

Cited by 20 publications

References 3 publications

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

A Simple and Rapid Spectrophotometric Determination of Thallium(III) with Trifluoperazine Hydrochloride

Spectrophotometric Determination of Cerium with Leuco Xylene Cyanol FF

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