Sensitized extraction spectrophotometric determination of Hg(II) with dithizone after its flotation as ion-associate using iodide and ferroin

Hosseini, Mohammad Saeid; Hashemi‐Moghaddam, Hamid

doi:10.1016/j.talanta.2005.01.010

Cited by 71 publications

(40 citation statements)

References 29 publications

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“…Spectrophotometry is the most common technique used for metal determination using various chromogenic reagents [1][2][3][4][5][6][7][8][9][10], owing to its simplicity and low cost. However, the spectrophotometric determination of metals in ultra trace level in solution is difficult due to various factors, particularly their low concentrations and matrix effects.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric determination of iridium after complexation and membrane filtration

Amin

Zaafarany

2015

Analytical Chemistry Research

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a b s t r a c tA simple, ultra sensitive and selective method for the spectrophotometric determination of Ir 3+ in various synthetic and environmental samples was reported. The analyte ions were collected on a membrane filter in the form of their red complex with 5-(2-benzothiazolyl-azo)8-hydroxy-quinoline (BTAHQ), and the absorption spectra of the colored membrane filters were acquired. Effects of pH value, sample volume, and amount of BTAHQ were examined in order to optimize sensitivity. The interference by common other ions was eliminated using appropriate masking agents. The absorbance is linearly related to the concentration of Ir 3+ in the ranges from 0.1 to 0.8 lg/L, and from 1.0 to 7.0 lg/L, respectively, the correlation coefficients (R 2 ) being 0.9996 and 0.9994. The molar absorptivities were calculated to be 4.81 Â 10 5 and 4.26 Â 10 7 L mol À1 cm À1 at 563 nm, whereas Sandell sensitivity was found as 0.391 and 0.004 ng cm À2 , respectively. The novelty and advantages of the proposed method is the highly sensitivity of the proposed method compared with all previously cited methods for iridium determination. Under the optimal conditions, the detection limit is 0.03 lg/L. The recoveries in case of spiked samples are between 98.7% and 101.5%, and the relative standard deviations range from 1.21% to 1.75%. Ó 2015 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/3.0/).

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Section: Introductionmentioning

confidence: 99%

Spectrophotometric determination of iridium after complexation and membrane filtration

Amin

Zaafarany

2015

Analytical Chemistry Research

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“…Since mercury has recognized accumulative and persistent characters and can easily penetrate into the skin and cell membranes, it can be accumulated in the body and cause human health problems such as irreversible damages to DNA and the central nervous system, and mitosis impairment [5,6]. Therefore, several techniques have been developed for Hg 2+ detection and quantification based on spectrophotometry [7], electrochemical [8], atomic absorption spectrometry [9], and fluorescence [10,11] methods. Among them, fluorescence analysis has great importance due to its high sensitivity, selectivity, versatility, rapid response time and simple handling.…”

Section: Introductionmentioning

confidence: 99%

Selective Detection of Mercury Ion by a Fluorescent Sensor Based on Dipeptide Containing Cysteine

Azuma

Fukushima

2014

J. Photopol. Sci. Technol.

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Two fluorescent peptidyl chemosensors containing cysteine and a dansyl group (DNS-γGlu-Cys, DNS-Cys-Glu) were prepared via Boc solution phase peptide synthesis for monitoring heavy metal ions on the basis of phytochelatin peptide sequence. DNS-Cys-Glu displayed a selective fluorescence turn-off response to Hg 2+ over other heavy metal ions. In contrast, the addition of various metal ions to DNS-γGlu-Cys resulted in no significant fluorescent changes. For DNS-Cys-Glu, because the thiol group of Cys is adjacent to the sulfonamide group, they can bind to Hg 2+ by cooperative electrostatic interactions. As a result, the quenching of the fluorescence intensity can be explained in terms of effective electron transfer from the excited dansyl fluorophore to the bound Hg 2+ . DNS-Cys-Glu could be applicable to homogeneous Hg 2+ detection.

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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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Sensitized extraction spectrophotometric determination of Hg(II) with dithizone after its flotation as ion-associate using iodide and ferroin

Cited by 71 publications

References 29 publications

Spectrophotometric determination of iridium after complexation and membrane filtration

Spectrophotometric determination of iridium after complexation and membrane filtration

Selective Detection of Mercury Ion by a Fluorescent Sensor Based on Dipeptide Containing Cysteine

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

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