Silica Gel Loaded with o -Dihydroxybenzene: Design, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Venkatesh, G.; Singh, Ajai K.; Venkataramani, B.

doi:10.1007/s00604-003-0132-z

Cited by 50 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The sorption capacities of the present SiG-NPPDA adsorbent compares well with those reported for FCPASASG adsorbent recently published by Akl and her colleagues 15 and are better than the sorption capacities reported for silica gel, 19,21,24 Amberlite XAD-2 38,39 and cellulose 40 supports. The adsorbent SiG-NPPDA and the solid chelates formed between SiG-NPPDA adsorbent and the studied metal ions were chemically characterized and confirmed by IR (absorption and reflectance), pH-metric titration and thermo-gravemetric (TG and DTG) analysis.…”

Section: Resultssupporting

confidence: 90%

“…[15][16][17][18][19][20][21][22][23][24] In the present study, the adsorption characteristics of the modified silica gel (SiG-NPPDA) and its application to the preconcentration and separation of traces of nine heavy metals The use of the chemically modified silica gel N-(3-propyl)-O-phenylenediamine (SiG-NPPDA) adsorbent, for the preconcentration and separation of trace heavy metals, was described. SiG-NPPDA sorbs quantitatively (90 -100% recovery) trace amounts of nine heavy metals, viz., Cd(II), Zn(II), Fe(III), Cu(II), Pb(II), Mn(II), Cr(III), Co(II) and Ni(II) at pH 7 -8.…”

mentioning

confidence: 99%

“…12,13 The sorption mechanism of the modified silica gel for the metals was described by Koklu 14 Concentration and separation of some microelements on silica gel with grafted chelating groups are represented in Table 1. [15][16][17][18][19][20][21][22][23][24] In the present study, the adsorption characteristics of the modified silica gel (SiG-NPPDA) and its application to the preconcentration and separation of traces of nine heavy metals viz., Cr(III) …”

mentioning

confidence: 99%

See 2 more Smart Citations

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

2005

View full text Add to dashboard Cite

Trace metal ions have important roles in life, involving a wide spectrum of activities. Thus, the determination of trace metal ions is becoming increasingly important because of increased interest in environmental samples. [1][2][3] Flame atomic absorption spectrometry (FAAS) has been widely used for the determination of trace heavy metal ions in water samples, [4][5][6] because of its high specificity and low cost. The presence of even low concentrations (ppb) of some heavy metals in natural water systems can have a hazardous effect on both wild life and humans.However, the direct determination of trace concentrations of these elements by FAAS is generally difficult because of matrix interference problems and concentrations that are below the detection limits of FAAS. At these low concentrations of metals, the sample often requires preconcentration before analysis can be undertaken. Several methods have been employed in the preconcentration of metal ions from aqueous solutions, such as solvent extraction using chelating agents 7 and the use of polymeric resins. 8These methods suffer from a number of drawbacks. The use of chelating reagents (i.e. iminodiacetate resin) is time consuming, whereas organic resins possess low mechanical stabilities and the time taken for the metal ion to be complexed can reach the order of hours. In addition, these methods are often unselective towards the metal being analyzed, with interference from alkaline earth metals being particularly problematic. 9 In recent years, the use of modified silica gels in the preconcentration of trace metals has been investigated. 10,11 As with applications in catalysis modified silica gels offer the advantages of high surface areas and increased mechanical stability. Silica gel modified with organic functional groups such as -NH2, -SH, and -CH has been a subject of great interest. 12,13 The sorption mechanism of the modified silica gel for the metals was described by Koklu 14 as shown below:(2) NH2 (on surface)Concentration and separation of some microelements on silica gel with grafted chelating groups are represented in Table 1. [15][16][17][18][19][20][21][22][23][24] In the present study, the adsorption characteristics of the modified silica gel (SiG-NPPDA) and its application to the preconcentration and separation of traces of nine heavy metals The use of the chemically modified silica gel N-(3-propyl)-O-phenylenediamine (SiG-NPPDA) adsorbent, for the preconcentration and separation of trace heavy metals, was described. SiG-NPPDA sorbs quantitatively (90 -100% recovery) trace amounts of nine heavy metals, viz., Cd(II), Zn(II), Fe(III), Cu(II), Pb(II), Mn(II), Cr(III), Co(II) and Ni(II) at pH 7 -8. The sorption capacity varies from 350 to 450 µmol g -1 . Desorption was found to be quantitative with 1 -2 M HNO3 or 0.05 M Na2EDTA. The distribution coefficient, Kd and the percentage concentration of the investigated metal ions on the adsorbent at equilibrium, CM,eqm% (Recovery, R%), were studied as a function of experimental parameters.The logarit...

show abstract

Section: Resultssupporting

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

2005

View full text Add to dashboard Cite

show abstract

“…A number of sorbents, such as amberlite XAD [13], amberlite XAD-2-functionalized with 2-(2 I -benzothiazolylazo)-p-cresol (BTAC-XAD) [18], organically modified clay [19], modified silica gel [20][21][22][23], polyethylenimine methylenephosphonic acid (PEIMPA) [24], and calixarenes [25,26], have been used as solid-phase extraction materials. Among these, silica gel, especially when modified with different metal-chelating organic compounds and microorganisms [27][28][29][30][31], has received great attention due to a number of advantages, such as good mechanical and thermal stability, selectivity, no swelling, and easy regeneration [32]. Park and Cha [33] have modified silica-gel in order to obtain an adsorbent for Ni(II) sorption and preconcentration from the synthetic metal solution.…”

Section: Introductionmentioning

confidence: 99%

Determination of Copper in Water Samples after Solid‐phase Extraction Using Dimethylglyoxime‐modified Silica

Anılan

Gedikbey

Akar³

2010

CLEAN Soil Air Water

View full text Add to dashboard Cite

This work describes the modification of silica gel with dimethylglyoxime, in order to prepare an effective sorbent for the preconcentration and determination of copper. The sorption capacity of dimethylglyoxime-modified silica-gel (DMGMS) was 71.37 mg g -1 and the optimum pH for the quantitative recovery of copper was found to be 5.0. The optimum flow rate, sorbent amount, and sample volume were 1 mL min -1 , 300 mg, and 50 mL, respectively. 10 mL of 0.1 mol L -1 HCl was the most suitable eluent. The detection limit of copper was 6.0 ng mL -1 . The recommended method, for the determination of copper, is simple and reliable, without any notable matrix effect and can be successfully applied to environmental water samples. Copper recovery in the range from 99 -100% was obtained from seawater and thermal spring water using this method. The method was applied to standard reference materials, NIST-1515 (apple leaves) and NIST-1643e (simulated fresh water), for the determination of copper and the results were in good agreement with certified values.

show abstract

“…3,4 These systems could be used for preconcentration and determination of cations in a wide range of samples. [5][6][7] A great advantage of the incorporation is the reduction of leaching of the ligand from the support. Many methods have been reported to use combinations of sorbent-ligant to synthesise powerful material for metal preconcentration and determination.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and application of XAD-2/Me-BTAP resin for on-line solid phase extraction and determination of trace metals in biological samples by FAAS

Lemos¹,

David²,

Santos³

2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Uma nova resina XAD-2/Me-BTAP foi desenvolvida e aplicada a um sistema em linha para a pré-concentração e determinação de metais por FAAS. O reagente usado na síntese da resina foi o 2-[2´-(6-metil-2´-benzotiazolilazo)-4-aminofenol (Me-BTAP), um composto produzido pela primeira vez para esta aplicação. O reagente e a resina foram caracterizados e o sorvente foi usado como recheio de uma mini-coluna em um sistema de pré-concentração em linha para a determinação de cobalto, cobre e níquel. Os fatores de enriquecimento calculados foram 19 (Co), 12 (Cu) e 12 (Ni), para 60 s de tempo de pré-concentração, e 30 (Co), 30 (Cu) e 24 (Ni), se usados 180 s para a pré-concentração. O procedimento proposto viabilizou a determinação de cobalto, cobre e níquel com limites de detecção de 0,34, 0,87 e 0,81 μg L -1 , respectivamente, quando usados intervalos de pré-concentração de 180 s. A exatidão do procedimento foi avaliada através da análise de materiais de referência certificados. O método foi aplicado à análise de amostras de alimentos (chá preto e farinha de arroz).A new XAD-2/Me-BTAP resin has been developed and applied in an on-line system for the preconcentration followed by metal determination by FAAS. The reagent used in the resin synthesis was 2-[2´-(6-methyl-benzothiazolylazo)]-4-aminophenol (Me-BTAP), a compound produced by first time for the application described in this work. The reagent and resin were characterized and the sorbent was used as packing for the minicolumn in an on-line system preconcentration system for cobalt, copper and nickel determination. The enrichment factors calculated were 19 (Co), 12 (Cu) and 12 (Ni), for 60 s preconcentration time, and 30 (Co), 30 (Cu) and 24 (Ni), if used 180 s preconcentration time. The proposed procedure allowed the determination of cobalt, copper and nickel with limits of detection 0.34, 0.87 and 0.81 μg L -1 , respectively, when used preconcentration periods of 180 s. The accuracy of the developed procedure was evaluated by the analysis of certified reference materials. The method was applied to the analysis of food samples (black tea and rice flour).

show abstract

Silica Gel Loaded with o -Dihydroxybenzene: Design, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Cited by 50 publications

References 0 publications

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Determination of Copper in Water Samples after Solid‐phase Extraction Using Dimethylglyoxime‐modified Silica

Synthesis and application of XAD-2/Me-BTAP resin for on-line solid phase extraction and determination of trace metals in biological samples by FAAS

Contact Info

Product

Resources

About