4-(3,5-Dichloro-2-pyridylazo)-1-3-diaminobenzene-graphite paste electrode for end-point detection in the automatic potentiometric titration of zinc(II) with EDTA

Raba, Julio; Fontan, C. A.; Cortinez, V.A.

doi:10.1016/0039-9140(94)80120-7

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…Por outro lado, eletrodos de pasta de carbono (EPC) têm sido empregados frequentemente nos mais diversos campos de análise eletroquímica [4][5][6][7][8][9] dada a facilidade de sua preparação, a versatilidade na modificação química da pasta e sua rápida renovação. As propriedades dos eletrodos de microcavidade de contato sólido podem ser somadas as dos eletrodos de pasta de carbono preenchendo-se a micro ou minicavidade com a pasta de carbono contendo ou não modificadores.…”

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Eletrodo de pasta de carbono em minicavidade de contato sólido

et al. 2012

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Este trabalho descreve a preparação de eletrodo de pasta de carbono (EPC) em minicavidade de contato sólido e sua avaliação quando a pasta de carbono contém ou não partículas submicormétricas de SiO2(Eu3+ 2%) e SiO2(Eu3+ 2%)-lisina. Nestes estudos, medidas de voltametria cíclica e impedância eletroquímica foram realizadas em PBS (0,1 mol L-1 pH 7,4) contendo as espécies redox Fe(CN)6-3/-4. Os resultados de impedância foram interpretados baseados na reação de transferência de carga envolvendo as espécies Fe(CN)6-3/-4 e/ou oxigênio em frequências mais altas e, difusão das espécies eletroativas e características da pasta de carbono a baixas frequências. EPC-inicavidade é apropriado para eletroanálises usando pasta de carbono modificada.

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Eletrodo de pasta de carbono em minicavidade de contato sólido

et al. 2012

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“…Several spectrophotometric procedures reported in the literature for the determination of Zn(II) are summarized by Bhalotra et al [4] and a previous solvent extraction step is required in other spectrophotometric methods [5][6][7][8][9]. Electroanalytical methods such as potentiometry [10][11][12], potenciometric stripping analysis [13,14] and anodic redissolution stripping voltammetry also were described [15].…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

Fatibello‐Filho

Vieira

2009

Eclet. Quím.

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A spectrophotometric flow injection method for the determination of Zn(II) in ophthalmic formulations was developed. In this work, Zn(II) ion was complexed with Alizarin red S in borate buffer solution (pH 9.0) and the chromophore produced was monitored at 520 nm. The analytical curve was linear in the Zn(II) concentration range from 6.05 x 10 -6 to 1.50 x 10 -4 mol L -1 with a detection limit of 3.60 x 10 -6 mol L -1 . Recoveries ranged from 96.3 to 105 % and a relative standard deviation of 1.2 % (n = 10) for 5.5x10 -5 mol L -1 Zn(II) reference solution were obtained. The sampling rate was 60 h -1 and the results obtained of Zn(II) in ophthalmic products using this procedure are in close agreement with those obtained using a comparative spectrophotometric procedure at 95 % confidence level.

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“…Electroanalytical methods such as potentiometry [10][11][12], potenciometric stripping analysis [13,14] and anodic redissolution stripping voltammetry also were described [15].…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

Fatibello‐Filho

Vieira

2009

Eclet. Quim.

View full text Add to dashboard Cite

A spectrophotometric flow injection method for the determination of Zn(II) in ophthalmic formulations was developed. In this work, Zn(II) ion was complexed with Alizarin red S in borate buffer solution (pH 9.0) and the chromophore produced was monitored at 520 nm. The analytical curve was linear in the Zn(II) concentration range from 6.05 x 10-6 to 1.50 x 10-4 mol L-1 with a detection limit of 3.60 x 10-6 mol L-1. Recoveries ranged from 96.3 to 105 % and a relative standard deviation of 1.2 % (n = 10) for 5.5x10-5 mol L-1 Zn(II) reference solution were obtained. The sampling rate was 60 h-1 and the results obtained of Zn(II) in ophthalmic products using this procedure are in close agreement with those obtained using a comparative spectrophotometric procedure at 95 % confidence level.

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4-(3,5-Dichloro-2-pyridylazo)-1-3-diaminobenzene-graphite paste electrode for end-point detection in the automatic potentiometric titration of zinc(II) with EDTA

Cited by 8 publications

References 5 publications

Eletrodo de pasta de carbono em minicavidade de contato sólido

Eletrodo de pasta de carbono em minicavidade de contato sólido

Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

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