Separation and Preconcentration of Trace Amounts of Lead on Octadecyl Silica Membrane Disks Modified with a New O, S-Containing Schiff’s Base and Its Determination by Flame Atomic Absorption Spectrometry

Hashemi, Omid Reza; Raoufi, Farhad; Ganjali, Mohammad Reza; Moghimi, Abolghasem; Razi, Maryam Kargar; Aghabozorg, Hossein; Shamsipur, Mojtaba

doi:10.2116/analsci.16.1221

Cited by 29 publications

(14 citation statements)

References 20 publications

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“…It was found that, in the range of 1 -20 cm 3 min -1 , the retention of silver by the membrane disk was not considerably affected by the sample solution flow rate. Similar results for the extraction of organic 18,26 and inorganic materials [19][20][21][22] by octadecyl silica disks have already been reported in the literature. On the other hand, the quantitative analysis of Ag + ions from modified membrane disks was achieved in a flow rate range of 1 -10 cm 3 , using 20 cm 3 of 2.0 M sodium thiosulfate as a stripping solution.…”

Section: Flow Rate and Effect Of Phsupporting

confidence: 88%

“…[16][17][18][19] Moreover, SPE disks modified by suitable ligands have been successfully used for the separation and sensitive determination of metal ions. [20][21][22] There are several literature reports dealing with the preconcentration of silver ions based on SPE, most of which employ chelating groups bound to resins or other polymeric supports; these include 2-mercaptobenzothiazolyl on poly(acrylonitrile) fibers, diethyldithiocarbamate on activated carbon and sulfhydryl on cotton microcolumns. [23][24][25] However, to the best of our knowledge, there is only one report on the use of modified octadecylsilica membrane disks for the separation and preconcentration of Ag + with a detection limit of 50 ng/dm 3 .…”

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confidence: 99%

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Solid Phase Extraction of Ultra-Trace Amounts of Ag+ by Using Octadecyl Silica Membrane Disks Modified with a New Fulvalen Derivative

et al. 2001

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Silver has long been an important metal in commerce. It is valued for its resistance to corrosion and for its use in alloys, medicine and jewelry. 1 The recovery of silver from waste solutions has commercial importance, and improved methods for accomplaced this, are of interest. Recent information about the interaction of silver with essential nutrients, especially Se, Cu, vitamin E and vitamine B12, have focused attention on its potential toxicity. 2,3 Improved means of lowering silver concentrations are needed, since the acceptable level, 10 ng/dm 3 , is exceeded in many culinary water supplies. The analysis of Ag + ions at low concentration in the presence of other cations at high concentration, requires very sensitive techniques.The most common methods for the determination of silver ion are flame and furnace atomic absorption spectrometry, 4 spectrophotometry, 5 stripping voltammetry and potentiometry. 6 Unfortunately, their sensitivity is usually insufficient for the low concentrations in environmental samples.Consequently, a preconcentration and matrix elimination step is usually required. The most widely used techniques for the separation, preconcentration of trace amounts of silver are liquid-liquid extraction, 7 coprecipitation with tellurium, 8,9 absorption of silver on powdered dithizone, 10 and rhodamine, 11 ion exchange resin, 12 fire assay with platinum metal in the presence of cuprous sulfide as collector 13 and solid phase extraction (SPE). 14 The solid-phase extraction techniques reduce solvent usage and exposure, disposal cost, and the extraction time for sample preparation. 15 Recently, octadecyl-bonded silica SPE disks have been utilized for the extraction and analysis of many different organic and environmental matrices. [16][17][18][19] Moreover, SPE disks modified by suitable ligands have been successfully used for the separation and sensitive determination of metal ions. [20][21][22] There are several literature reports dealing with the preconcentration of silver ions based on SPE, most of which employ chelating groups bound to resins or other polymeric supports; these include 2-mercaptobenzothiazolyl on poly(acrylonitrile) fibers, diethyldithiocarbamate on activated carbon and sulfhydryl on cotton microcolumns. [23][24][25] However, to the best of our knowledge, there is only one report on the use of modified octadecylsilica membrane disks for the separation and preconcentration of Ag + with a detection limit of 50 ng/dm 3 . 14 In this work, a simple and reliable method for the rapid extraction and determination of ultra-trace amounts of Ag + ions using an octadecyl-bonded silica membrane disk modified with tetramethyl tetrathia fulvalen (TMTTF) and graphite furnace atomic absorption spectrometry is presented. Experimental ReagentsAcetic acid, nitric acid, sodium thiosulfate and high-purity of methanol (all from Merck) were used as received. Analyticalgrade silver nitrate and other salts (all from Merck) were of the highest purity available, and were dried in a vacuum over P2O5. A simpl...

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Section: Flow Rate and Effect Of Phsupporting

confidence: 88%

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confidence: 99%

Solid Phase Extraction of Ultra-Trace Amounts of Ag+ by Using Octadecyl Silica Membrane Disks Modified with a New Fulvalen Derivative

et al. 2001

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“…As it is obvious, the concentration Measurements were done after four times concentration by evaporation; b values in parentheses are RSDs based on three replicate analysis factor of the method by using BSTD is superior to those previously reported 17,21,22,[29][30][31][32][33] .…”

Section: Comparison Of Concentration Factor Of This Work and Other Rementioning

confidence: 91%

Ultra-trace monitoring of copper in environmental and biological samples by inductively coupled plasma atomic emission spectrometry after separation and preconcentration by using octadecyl silica membrane disks modified by a new schiff's base

Ganjali¹,

Pourjavid²,

Babaei³

et al. 2004

Quím. Nova

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Recebido em 26/2/03; aceito em 24/10/03 Ultra-trace amounts of Cu(II) were separated and preconcentrated by solid phase extraction on octadecyl-bonded silica membrane disks modified with a new Schiff , s base ( Bis-(2-Hydroxyacetophenone) -2,2-dimethyl-1,3-propanediimine) (SBTD) followed by elution and inductively coupled plasma atomic emission spectrometric detection. The method was applied as a separation and detection method for copper(II) in environmental and biological samples. Extraction efficiency and the influence of sample matrix, flow rate, pH, and type and minimum amount of stripping acid were investigated. The concentration factor and detection limit of the proposed method are 500 and 12.5 pg mL -1 , respectively.

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“…The base of metal separation by C 18 -bonded silica membrane disk is addition of a complexing reagent to the sample solution, followed by the retention of metal complexes on the disk [24,25]. Membrane disk has also been modified by chelating agents for selective extraction and determination of metal ions [26][27][28][29][30]. Schiff base compounds derived from salicylaldehyde (salens and salophens) as polydentate ligands are able to form stable complexes with several transition metal ions [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Solid phase extraction of zinc with octadecyl silica membrane disks modified by N,N’-disalicylidene-1,2-phenylendiamine and determination by flame atomic absorption spectrometry

et al. 2008

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A procedure for separation and preconcentration of trace amounts of Zn(II) from aqueous media is proposed. The procedure is based on the adsorption of Zn2+ on octadecyl bonded silica membrane disk modified with N,N’-disalicylidene-1,2-phenylendiamine at pH 7. The retained zinc ions were then stripped from the disk with a minimal amount of 1.5 mol L-1 hydrochloric acid solution as eluent, and determined by flame atomic absorption spectrometry. Maximum capacity of the membrane disk modified with 5 mg of the ligand was found to be 226 μg Zn2+. The relative standard deviation of zinc for ten replicate extraction of 10 μg zinc from 1000 mL samples was 1.2%. The limit of detection of the proposed method was 14 ng of Zn2+ per 1000 mL. The method was successfully applied to the determination of zinc in natural water samples and accuracy was examined by recovery experiments and independent analysis by graphite furnace atomic absorption spectrometry (GFAAS).

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Separation and Preconcentration of Trace Amounts of Lead on Octadecyl Silica Membrane Disks Modified with a New O, S-Containing Schiff’s Base and Its Determination by Flame Atomic Absorption Spectrometry

Cited by 29 publications

References 20 publications

Solid Phase Extraction of Ultra-Trace Amounts of Ag+ by Using Octadecyl Silica Membrane Disks Modified with a New Fulvalen Derivative

Solid Phase Extraction of Ultra-Trace Amounts of Ag+ by Using Octadecyl Silica Membrane Disks Modified with a New Fulvalen Derivative

Ultra-trace monitoring of copper in environmental and biological samples by inductively coupled plasma atomic emission spectrometry after separation and preconcentration by using octadecyl silica membrane disks modified by a new schiff's base

Solid phase extraction of zinc with octadecyl silica membrane disks modified by N,N’-disalicylidene-1,2-phenylendiamine and determination by flame atomic absorption spectrometry

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