Optimizing the immobilized dithizone on surfactant-coated alumina as a new sorbent for determination of silver

Absalan, Ghodratollah; Goudi, A Aghaei

doi:10.1016/j.seppur.2003.11.008

Cited by 30 publications

(18 citation statements)

References 9 publications

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“…Based on the results obtained, it could be explained that at pH lower than 5, hydronium ion could compete with CP + to form SDS -:H + ion pair and prevent the formation of SDS -:CP + ion pair, but at pH above 7, CPC and/ or SDS could be washed out by the eluent. 24 Consequently the load of the column with the adsorbent will be decreased; this gives a lower percent recovery for CPC adsorption on C 18 as can be observed in Figure 2.…”

Section: Effect Of Phmentioning

confidence: 96%

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

Karimi

Behjatmanesh–Ardakani

Goudi

et al. 2008

J. Braz. Chem. Soc.

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Um novo método de extração em fase sólida foi desenvolvido para separar e pré-concentrar traços de tensoativos catiônicos, tais como, brometo de dodeciltrimetilamônio (DTAB), brometo de cetiltrimetilamônio (CTAB) e cloreto de cetilpiridínio (CPC). Esse método é baseado na sorção do tensoativo aniônico (AS − ), dodecilssulfato de sódio (SDS), sobre a superfície de γ-alumina, enquanto um cartucho C 18 é utilizado para a pré-concentração dos tensoativos catiônicos (CS + ). O método espectrofotométrico, utilizado para a determinação dos tensoativos catiônicos, baseia-se na competição entre o corante catiônico, azul de metileno (MB + ), e o CS + , para associação e formação do complexo SDS. O íon complexo formado (MB + ) pode ser quantitativamente substituído pelo CS + , levando a um aumento da absorvância medida em 662 nm. Foram estabelecidas ótimas condições experimentais para a separação, pré-concentração e determinação dos tensoativos catiônicos. Sob essas condições otimizadas, realizou-se a pré-concentração (2×) e os resultados mostraram que a determinação do CPC, DTAB e CTAB poderia ser realizada nas faixas de concentração de 1×10 -5 -2×10 -4 , 4×10 -5 -5×10 -4 and 5×10 -5 -5×10 -4 mol L -1 , respectivamente. Por fim, a partir de onze determinações de 10,0 mg mL -1 das soluções de CPC, DTAB e CTAB obtiveram-se RSDs de 4,3, 3,7 e 4,0%, respectivamente. O método foi validado por meio de um conjunto de diferentes amostras que continham os tensoativos catiônicos.A new solid phase extraction method has been developed to the separation and preconcentration of trace amounts of cationic surfactants i.e. dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB) and cetylpyridinium chloride (CPC). This method is based on the sorption of anionic surfactant (AS -) of sodium dodecyl sulfate (SDS) on the γ-alumina surface and C 18 cartridge is used for preconcentration of cationic surfactants (CS + ). Spectrophotometric determination method used for the determination of cationic surfactants is based on the competition between the cationic dye of methylene blue (MB + ) and CS + for association complex formation with SDS. The MB + in the ion associate complex can be quantitatively substituted by CS + leading to an increase in the absorbance measured at 662 nm. Optimum experimental conditions for separation, preconcentration and determination of cationic surfactants have been reported. Under the selected optimal conditions, preconcentration factor of two-fold was achieved and the results showed that determination of CPC, DTAB and CTAB could be performed in concentration ranges of 1×10 -5 -2×10 -4 , 4×10 -5 -5×10 -4 and 5×10 -5 -5×10 -4 mol L -1 , respectively. Eleven determinations of 10.0 mg mL -1 of CPC, DTAB and CTAB solutions led to RSD's of 4.3, 3.7 and 4.0%, respectively. Method was validated using a set of different samples containing cationic surfactants.

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Section: Effect Of Phmentioning

confidence: 96%

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

Karimi

Behjatmanesh–Ardakani

Goudi

et al. 2008

J. Braz. Chem. Soc.

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“…Despite many benefits, these techniques have significant disadvantages that many researchers prefer solid phase extraction (SPE) because of its notable advantages including higher preconcentration factor, rapid phase separation, short analysis time, cost saving, and low consumption of organic solvents (Absalan and Aghaei Goudi 2004;Liang et al 2001;Pourreza and Behpour 1999). One of the main factors in SPE procedure is suitable sorbent selection because of its effect on enrichment factor and recovery (Poole 2003).…”

Section: Introductionmentioning

confidence: 99%

A new sorbent based on MWCNTs modification for separation/preconcentration of trace amounts of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) and their determination by flame atomic absorption spectrometry

et al. 2015

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“…The most common methods of removing metal ions is by the use of precipitation, coagulation, ion exchange, floatation, reverse osmosis, membrane filtration, solvent extraction (Quintelas et al,2009) and metal recovered as insoluble salt after sedimentation. The increasing use of silver in water purification, industrial processes and components, medicine, and photographic Absalan and Goudi (2004) and it potential environmental impact means that silver should be removed and recovered, there is an important to improve the technological new and cost effective methods for silver recovery Ajiwe and Anyadiegwu (2000).That allows recovering of wastes one promising approach is high affinity absorption process when selective binding allows the concentration of recovery from dilute process streams. Sorption can occur on particles a variety of surfaces, but only few materials are known to possess adsorptive efficiencies or reactive surfaces sufficiently favorable for adsorbing metal ions such as silver ions.…”

Section: Introductionmentioning

confidence: 99%

Removal of silver from wastewater using cross flow microfiltration

Zanain

Lovitt

2013

E3S Web of Conferences

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Abstract. Removal of silver from wastewater was investigated using continuous cross flow microfiltration (MF) technique hollow fiber membranes with a pore size 0.2µm, with sorbent coated material Al 2 O 3 /SDSH 2 Dz particle size (8 µm). The coating investigated was dithizone (Diphenylthiocarbazone) in 0.005M ammonia solution. In the filtration of silver ion solutions, the effects of the permeate flow rate and cross flow velocity on the absorption of silver ion solutions, and since the pore size of membrane (=0.2 µm) is smaller then that of the (Al 2 O 3 ), no need to consider the variation of (Al 2 O 3 ).rejection as it can be considered to be 100%. The amount of silver absorbed into sorbent material Al 2 O 3 /SDSH 2 Dz was (25.35, 39.68 ppm) for the cross flown velocity of 5, 2.5 L/hr respectively, and were the results as function of permeate flow was (25.35, 39.68 ppm) for the velocity of 5, 2.5 L/hr respectively.

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Optimizing the immobilized dithizone on surfactant-coated alumina as a new sorbent for determination of silver

Cited by 30 publications

References 9 publications

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

A new sorbent based on MWCNTs modification for separation/preconcentration of trace amounts of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) and their determination by flame atomic absorption spectrometry

Removal of silver from wastewater using cross flow microfiltration

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