Determination of Thallium(I) by Flotation-Spectrophotometric Method Using Iodide and Rhodamine B

Hosseini, Mohammad Said; Naseri, Yousef

doi:10.2116/analsci.19.1505

Cited by 28 publications

(17 citation statements)

References 26 publications

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“…[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Primary investigations showed that the none of two usual complexes of Ni and DMG could not float completely in interface of liquid and organic phase due to solubility in water and organic phase of Ni(Dm) 3 2-and Ni(HDm) 2 , respectively. Thus a different complex of Ni and DMG was studied.…”

Section: Introductionmentioning

confidence: 99%

A selective flotation-spectrophotometric method for the determination of nickel using dimethylglyoxime

Hashemi‐Moghaddam¹

2011

J. Braz. Chem. Soc.

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Um método simples e seletivo para a separação e pré-concentração de níquel foi desenvolvido. O método é baseado na flotação de um complexo de Ni e dimetilglioxima (DMG) na interface de uma solução aquosa com n-hexano. O complexo Ni-DMG foi separado e determinado por espectrofotometria. A flotação quantitativa do complexo foi possível no intervalo de pH de 9-12. O método é simples e livre da interferência de todos os cátions e ânions e apresenta um grande intervalo linear. O procedimento foi aplicado com sucesso na determinação de traços de níquel em águas de poços e águas residuais de um processo de eletrodeposição. A exatidão do método foi avaliada usando material de referência certificado (NIST 864) e enriquecendo as amostras com diferentes quantidades de Ni 2+ .A simple and selective method for separation and preconcentration of nickel has been developed. The method is based on the flotation of a complex of Ni and dimethylglyoxime (DMG) at the aqueous solution-n-hexane interface. The complex was separated and Ni determined spectrophotometrically by DMG after addition of oxidizing agent. The quantitative flotation of the complex was possible in the pH range of 9-12. The method is simple and free from the interference of all cations and anions and has a wide linear range. The procedure was successfully applied to the determination of trace amounts of nickel in well water and waste water in coating plant. The method's accuracy was investigated by using standard reference materials alloys (NIST 864) and by spiking the samples with different amounts of Ni 2+ . Keywords: flotation, spectrophotometry, dimethylglyoxime, nickel IntroductionNickel is an important constituent of several steel alloys. Its determination is required to control both raw material and industrial products. 1 In addition it is readily encountered in the environment, which enters from land-based resources, such as oxidic and sulfide ores or industrial sources, such as spent catalysts, alloy scrap, sludge, dust, and wastewater. 2 Dimethylglyoxime (DMG) is widely used and for the spectrophotometric determination of nickel 3,4 it has also been used for separation and preconcentration of Ni by liquid-liquid extraction 5 or solid phase extraction 6-8 but all of these separation methods suffer from lack of selectivity. For example, metal ions such as Ni(II), Pb(II), Mn(II), Bi(III), Co(II), Cd(II), Zn(II), and Fe(II) could interfere at concentrations higher than 5 mg L -1 in solid phase extraction of Ni 2+ using DMG as a complexing agent. 8 This paper deals with a selective and simple method for separation and preconcentration of Ni with DMG.Flotation spectrophotometry allows one to preconcentrate the trace elements in various materials. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Primary investigations showed that the none of two usual complexes of Ni and DMG could not float completely in interface of liquid and organic phase due to solubility in water and organic phase of Ni(Dm) 3 2-and Ni(HDm) 2 , respectively. Thus a different ...

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Section: Introductionmentioning

confidence: 99%

A selective flotation-spectrophotometric method for the determination of nickel using dimethylglyoxime

Hashemi‐Moghaddam¹

2011

J. Braz. Chem. Soc.

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“…1 Ion-association systems, in a more general way, could be said to result from the interaction of charged particles or complexes with oppositely charged ions. When a quaternary ammonium containing compound is used, the primary complex produced is cation, possessing the same charge as that of a metal.…”

Section: Introductionmentioning

confidence: 99%

“…Such complexes were made to associate with anionic dyes in order to be extractable from aqueous solutions. 1 Cetylpyridinium chloride (CPC), a quaternary ammonium salt, is widely used in industrial and pharmaceutical products, especially in manufacturing of mouth washers, drupes and cosmetics.…”

Section: Introductionmentioning

confidence: 99%

Development of a flotation-spectrophotometric method for determination of cetylpyridinium chloride in pharmaceutical products

Parham¹,

Moradi²

2011

Quím. Nova

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Recebido em 17/8/10; aceito em 16/11/10; publicado na web em 18/2/11A new simple and sensitive flotation-spectrophotometric method for the determination of cetylpyridinium chloride (CPC) is reported. The method is based on the formation of an ion-associate between CPC and Orange II (OR) which is floated in the interface of aqueous phase and n-hexane by vigorous shaking. The aqueous solution was discarded and the adsorbed ion associate on to the wall of a separating funnel was dissolved in a small volume of methanol solvent and its absorbance was measured at 480 nm. The apparent molar absorptivity (ε) of the ion associate was determined to be 4.12 x 10 5 L mol -1 cm -1 . The calibration graph was linear in the concentration range of 15-800 ng mL -1 of CPC with a correlation coefficient of 0.9988. The limit of detection (LOD) was 10.8 ng mL -1 . The relative standard deviation (RSD) for determination of 100 and 800 ng mL -1 of CPC was 3.47 and 2.04% (n=7), respectively. The method was successfully applied to the determination of CPC in a commercial mouth washer product.

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“…For this purpose, many separation and preconcentration techniques for the determination of thallium have been proposed including solvent extraction (Shimizu et al, 1998;Wei et al, 2003;Shah et al, 2009;Zvinowanda et al, 2009), single drop extraction, Flotation and solid phase extraction (Chang et al, 2001;Yu et al, 2001;Abou-El-Sherbini et al, 2003;Hosseini and Naseri, 2003;Nameni et al, 2008;Chamsaz et al, 2009 ). However, these methods are laborious and are apt to carry a risk of contamination.…”

Section: Introductionmentioning

confidence: 99%

Thallium determination using catalytic redox reaction between methylene blue and ascorbic acid

Tabatabaee

Shishehbore

Bagheri

et al. 2010

Int. J. Environ. Sci. Technol.

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Determination of Thallium(I) by Flotation-Spectrophotometric Method Using Iodide and Rhodamine B

Cited by 28 publications

References 26 publications

A selective flotation-spectrophotometric method for the determination of nickel using dimethylglyoxime

A selective flotation-spectrophotometric method for the determination of nickel using dimethylglyoxime

Development of a flotation-spectrophotometric method for determination of cetylpyridinium chloride in pharmaceutical products

Thallium determination using catalytic redox reaction between methylene blue and ascorbic acid

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