Ligands with the “ONNN” Group as Chelating and Preconcentrating Substances of Heavy Metal Ions: Aroylhydrazone Derivatives from Di-2-Pyridyl Ketone

Garcı́a-Vargas, Manuel; Belizón, M.; Hernández-Artiga, María P.; Martínez, Carolina Mendiguchía; Pérez-Bustamante, J.A.

doi:10.1366/0003702864507927

Cited by 42 publications

(27 citation statements)

References 17 publications

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“…Deprotonation of the enolic form of DPKSH is represented by ROH. 16 This study focused on the evaluation of an anionic resin modified with DPKSH and the utilization of the modified resin as a solid phase for in-line copper separation and preconcentration. The mechanism of adsorption was obtained through kinetic and isotherm models.…”

Section: Introductionmentioning

confidence: 99%

An anionic resin modified by di-2-pyridyl ketone salicyloylhydrazone as a new solid preconcentration phase for copper determination in ethanol fuel samples

Garcia¹,

Gaubeur²

2011

J. Braz. Chem. Soc.

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A adsorção do DPKSH em resina aniônica foi investigada a 25 ± 1 °C e em pH 12 com base em três modelos cinéticos pseudo-primeira ordem, pseudo-segunda ordem e difusão intra-partícula. Os dados experimentais foram aplicados com sucesso aos modelos das isotermas de Langmuir, Freundlich e Dubinin-Radushkevich (D-R). A resina aniônica modificada com DPKSH foi usada na determinação espectrofotométrica do cobre após pré-concentração em linha. Nas melhores condições, foi observada uma resposta linear entre 20 e 80 mg L , respectivamente, com um nível de confiança de 95%, e um fator de pré-concentração igual a 11. O desvio padrão relativo foi estimado em 2,6% para a concentração de 32 mg L -1 Cu(II) (n = 20). Os resultados obtidos na determinação de cobre em amostras de etanol combustível apresentaram concordância, com um nível de confiança de 99%, aos obtidos por espectrometria de absorção atômica com chama (F AAS).The adsorption of DPKSH onto anionic resin was investigated at 25 ± 1 °C and pH 12 on the basis of three kinetic models including pseudo-first order, pseudo-second order and intraparticle diffusion. Isotherm equations including Langmuir, Freundlich and Dubinin-Radushkevich (D-R) were successfully applied to model the experimental data. An anionic resin loaded with DPKSH was used in a flow system for the in-line concentration of copper prior to spectrophotometric determination. Under optimized conditions, a linear response was observed between 20 and 80 µg L , respectively, at the 95% confidence level with an enrichment factor of 11. The relative standard deviation was estimated to be 2.6% for 32 mg L -1 Cu(II) (n = 20). The results obtained for copper determination in ethanol fuel samples agreed with those achieved by flame atomic absorption spectrometry (F AAS) at the 99% confidence level.

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Section: Introductionmentioning

confidence: 99%

An anionic resin modified by di-2-pyridyl ketone salicyloylhydrazone as a new solid preconcentration phase for copper determination in ethanol fuel samples

Garcia¹,

Gaubeur²

2011

J. Braz. Chem. Soc.

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“…All the solutions were prepared with doubly distilled water. The spectrophotometric reagent dPKBH was synthesized according to the procedure outlined by García Vargas et al [12]. Thus, equimolar amounts of di-2-pyridyl ketone and benzoylhydrazide were mixed in ethanol, and a few drops of concentrated hydrochloric acid were added.…”

Section: Reagents and Solutionsmentioning

confidence: 99%

“…dPKBH has been previously described as a bidentate or tridentate ligand for several heavy metals [12]. Besides this, it has been applied to the spectrophotometric determination of iron [13,14,15], palladium [16], cobalt [17,18,19] and nickel [20,21].…”

Section: Introductionmentioning

confidence: 99%

A simple and very sensitive spectrophotometric method for the direct determination of copper ions

2002

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A sensitive spectrophotometric method for the direct determination of copper in aqueous samples without a preconcentration step has been developed. It is based on the formation of a yellow complex with the chromogenic reagent di-2-pyridyl ketone benzoylhydrazone (dPKBH) in an alkaline medium. The complex stoichiometry was 1:2 (Cu:dPKBH) and presents maximum absorbance at 370 nm. The influence of chemical variables affecting the behaviour of the system such as pH, concentration of dPKBH, buffer solution and ethanol, order of addition of the reagents and stability of the complex, were evaluated. The molar absorptivity (epsilon) was 3.92x10(4) L mol(-1) cm(-1), and Beer's law was obeyed up to 3 mg L(-1) of copper. The relative standard deviation was 0.46% (n=11) for a sample containing 1 mg L(-1) Cu(II). The limit of detection was 2.5 micro g L(-1) and was therefore more sensitive than the direct methods reported previously. Finally, the method was successfully validated by analysing several real samples with different matrices, such as tap water, natural water or copper alloys, with an average relative error of 2.46%.

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“…A di-2-piridil cetona benzoilhidrazona (DPKBH) foi inicialmente sintetizada por N akanishi e Otomo(l) e Garcia-Vargas et al (2). Este reagente pertence ao grupo das aroilhidrazonas que são caracterizadas pelo grupo triatômico C=N-N, e pode ser facilmente preparado a partir da aroilhidrazona e o derivado carbonílico (benzoilhidrazina e di-2-piridil cetona) em um solvente adequado.…”

Section: -Alguns Aspectos Sobreunclassified

“…Este reagente pertence ao grupo das aroilhidrazonas que são caracterizadas pelo grupo triatômico C=N-N, e pode ser facilmente preparado a partir da aroilhidrazona e o derivado carbonílico (benzoilhidrazina e di-2-piridil cetona) em um solvente adequado. É solúvel em uma série de solventes orgânicos mas pouco solúvel em água (2).…”

Section: -Alguns Aspectos Sobreunclassified

Determinação das constantes de dissociação/ionização da di-2-piridil cetona benzoilhidrazona (DPKBH) em diferentes porcentagens de etanol

Gaubeur¹

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ions in the presence of organic species found in natural waters.So as to better understand the DPKBH properties In ethanol, it was necessary to determine the dissociation/ionization constant in different percentages of ethanol (lO, 19, 29 and 48%). In these ethanol percentages, through absolute pH measurements, pKs of DPKBH could be the found by using the potentiometric technique, and in 10 and 48% of ethanol the pKs of DPKBH were determined with pH measurements associated to absorbance of the species present in the equilibria by using the spectrophotometric technique.In appropiate percentage of ethanol the behavior of the glass electrode was previously determined.

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Ligands with the “ONNN” Group as Chelating and Preconcentrating Substances of Heavy Metal Ions: Aroylhydrazone Derivatives from Di-2-Pyridyl Ketone

Cited by 42 publications

References 17 publications

An anionic resin modified by di-2-pyridyl ketone salicyloylhydrazone as a new solid preconcentration phase for copper determination in ethanol fuel samples

An anionic resin modified by di-2-pyridyl ketone salicyloylhydrazone as a new solid preconcentration phase for copper determination in ethanol fuel samples

A simple and very sensitive spectrophotometric method for the direct determination of copper ions

Determinação das constantes de dissociação/ionização da di-2-piridil cetona benzoilhidrazona (DPKBH) em diferentes porcentagens de etanol

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