Emprego de padrão único para a construção de curvas analíticas em sistema de análise por injeção em fluxo associado à espectrofotometria em fase sólida

Oliveira, Fábio Santos de; Korn, Mauro

doi:10.1590/s0100-40422003000400004

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…The valve activation and data acquisition were controlled by PC, as earlier described. 12 The assays with the residual solution of the Thiamethoxam ® were carried out by sonicating 5 mL of 100 mg L -1 of the herbicide solution in interval range from 10 to 60 min. After sonication, the chloride generated by sonochemical effect and the pH were measured.…”

Section: Methodsmentioning

confidence: 99%

Production of chloride and hypochlorite for analytical purposes by sonochemical degradation of organochlorines

Korn¹,

Acevedo²,

Borges³

et al. 2005

J. Braz. Chem. Soc.

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Neste trabalho foram enfatizadas as potencialidades da geração sonoquímica de reagentes pela irradiação ultra-sônica de resíduos de organoclorados de efluentes laboratoriais com a produção de soluções de cloreto e hipoclorito para propósitos analíticos. Foi avaliada a dependência entre a produção de cloreto obtida pela sonicação de efluentes contendo organoclorados e o tempo de irradiação para CCl 4 , CHCl 3 , CH 2 Cl 2 e do inseticida Thiamethoxam ® . Sob condições de saturação pôde ser observada a maior produção de cloreto para CHCl 3 . O processo sonoquímico de geração de cloreto mostrou boa precisão (RSD < 10%). A extensão da geração sonoquímica de hipoclorito foi também avaliada quando conduzida em presença de concentrações diferentes de NaOH. O hipoclorito gerado pela degradação de resíduos foi monitorado pelo método de Berthelot, empregado para a determinação de NH 4 + . Os resultados da produção de azul de indofenol obtidos com soluções de hipoclorito geradas sonoquimicamente foram comparados, para diferentes concentrações de NH 4 + , com solução comercial do reagente e nenhuma diferença significativa (nível de confiança de 95%) foi constatada.This work was aimed at highlighting the potentialities of the reagent generation by ultrasonic irradiation to produce chloride and hypochlorite solutions for analytical purposes derived from the residues of organochlorines of laboratory effluents. The dependence between the production of chloride obtained from the sonication of effluents containing organochlorines and the irradiation time was evaluated for CCl 4 , CHCl 3 , CH 2 Cl 2 and Thiamethoxam ® . It was observed that under saturation conditions the production of chloride was highest for CHCl 3 . Additionally, good precision related to the sonochemical generation of chloride was achieved (RSD < 10%). The extent of sonochemical generation of hypochlorite was also evaluated in the presence of different NaOH concentrations. The hypochlorite generated by the degradation of CCl 4 residues was monitored by the reference Berthelot method for NH 4 + determination. The results obtained with hypochlorite solution sonochemically generated for different NH 4 + concentration were compared with the conventional reagent and no significant difference (95% confidence level) was found.

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Section: Methodsmentioning

confidence: 99%

Production of chloride and hypochlorite for analytical purposes by sonochemical degradation of organochlorines

Korn¹,

Acevedo²,

Borges³

et al. 2005

J. Braz. Chem. Soc.

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“…[10][11][12] Multicommuted flow analysis process affords facilities to design active flow setup constituted by solenoid valves, which have been assembled to work as an independent commutator unit, thus allowing facilities to handle sample and reagent solutions controlled by microcomputer. [8][9][10][11]13,14 Zinc is present in all living cells as a constituent of several molecules involved in proteins, lipids and carbohydrates metabolism, as well as several enzymes. 15,16 In this sense, zinc is considered as an essential element for all animals, including humans.…”

Section: Introductionmentioning

confidence: 99%

A LED based photometer for solid phase photometry: zinc determination in pharmaceutical preparation employing a multicommuted flow analysis approach

Dias¹,

Reis²

2012

J. Braz. Chem. Soc.

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Neste trabalho é proposto um fotômetro baseado em LED (diodo emissor de luz) para fotometria em fase sólida. O fotômetro foi desenvolvido para permitir o acoplamento da fonte de radiação (LED) e do fotodetector direto na cela de fluxo, tendo um caminho óptico de 4 mm. A cela de fluxo foi preenchida com material sólido (C 18 ), o qual foi utilizado para imobilizar o reagente cromogênico 1-(2-tiazolilazo)-2-naftol (TAN). A exatidão foi avaliada empregando dados obtidos através da técnica ICP OES (espectrometria de emissão por plasma indutivamente acoplado). Aplicando-se o teste-t pareado não foi observada diferença significativa em nível de confiança de 95%. Outros parâmetros importantes encontrados foram faixa de resposta linear de 0,05 a 0,85 mg L -1 Zn, limite de detecção de 9 µg L -1 Zn (n = 3), desvio padrão de 1,4 % (n = 10), frequência de amostragem de 36 determinações por h, e uma geração de efluente e consumo de reagente de 1,7 mL e 0,03 µg por determinação, respectivamente.In this work, a LED (light emitting diode) based photometer for solid phase photometry is described. The photometer was designed to permit direct coupling of a light source (LED) and a photodiode to a flow cell with an optical pathlength of 4 mm. The flow cell was filled with adsorbing solid phase material (C 18 ), which was used to immobilize the chromogenic reagent 1-(2-thiazolylazo)-2-naphthol (TAN). Aiming to allow accuracy assessment, samples were also analyzed employing ICP OES (inductively coupled plasma optical emission spectrometry) methodology. Applying the paired t-test at the 95% confidence level, no significant difference was observed. Other useful features were also achieved: linear response ranging from 0.05 to 0.85 mg L -1 Zn, limit of detection of 9 µg L -1 Zn (3σ criterion), standard deviation of 1.4% (n = 10), sampling throughput of 36 determinations per h, and a waste generation and reagent consumption of 1.7 mL and of 0.03 µg per determination, respectively.

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The Concept of Multi‐Commutation in Flow Analysis

Feres

Zagatto

Santos

et al. 2008

Advances in Flow Analysis

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Emprego de padrão único para a construção de curvas analíticas em sistema de análise por injeção em fluxo associado à espectrofotometria em fase sólida

Cited by 4 publications

References 13 publications

Production of chloride and hypochlorite for analytical purposes by sonochemical degradation of organochlorines

Production of chloride and hypochlorite for analytical purposes by sonochemical degradation of organochlorines

A LED based photometer for solid phase photometry: zinc determination in pharmaceutical preparation employing a multicommuted flow analysis approach

The Concept of Multi‐Commutation in Flow Analysis

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