A downsized flow set up based on multicommutation for the sequential photometric determination of iron(II)/iron(III) and nitrite/nitrate in surface water

Feres, Mário A.; Reis, Boaventura F.

doi:10.1016/j.talanta.2005.09.001

Cited by 51 publications

(57 citation statements)

References 23 publications

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“…For instance, the method based on iron reaction with 1,10-phenanthroline has been used in selective determinations of Fe(II) and Fe(III) contents. The above method uses both the fact of forming multi-coloured complexes determined sequentially at different wavelengths: 396 and 512 nm for Fe(III) and Fe(II), respectively (Harvey et al 1955), and sequential determinations of Fe(II) and total iron following the reduction of Fe(III) to Fe(II) (Feres and Reis 2005;Galhardo and Masini 2001). 1,10-Phenanthroline has also been used in sequential determination of iron forms in direct colorimetric determinations combined with colorimetric titration (Kochana and Parczewski 1997).…”

Section: Introductionmentioning

confidence: 99%

Determination of Iron Species in Samples of Iron-Fortified Food

et al. 2014

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The paper presents the determination of iron forms in food products. The procedure of sample extraction was developed and optimized, preserving the content of particular forms of iron. The colorimetric method using 2,2′-bipirydyl (measurements at 520 nm) was applied in Fe(II) determinations, while in Fe(III) determinations, the colorimetric method with potassium thiocyanate (measurements at 470 nm) was applied. The total content of iron was determined by the technique of atomic absorption spectrometry, which allowed for the determination of iron content in organic and inorganic complex compounds. Detection limits of 1 mg kg −1 were obtained for all determined iron forms, with the precision ranging between 0.7 % and 1.5 % for 10 mg kg −1 concentration. The optimized analytical procedure was applied in the determinations of iron forms in iron-fortified food products.

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Section: Introductionmentioning

confidence: 99%

Determination of Iron Species in Samples of Iron-Fortified Food

et al. 2014

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“…[23][24][25][26] The multicommutation process [27][28][29] has been used as an efficient tool to handle solutions. The system manifold is constituted of a set of solenoid valves, 29,30 and a peristaltic pump or several solenoid micro-pumps employed to propel the solutions. [31][32][33] The manifold, constituted of solenoid valves 30 or solenoid mini-pumps, [31][32][33] is controlled by a microcomputer in order to insert the sample slugs and the reagent solution into the analytical path.…”

Section: Introductionmentioning

confidence: 99%

“…The system manifold is constituted of a set of solenoid valves, 29,30 and a peristaltic pump or several solenoid micro-pumps employed to propel the solutions. [31][32][33] The manifold, constituted of solenoid valves 30 or solenoid mini-pumps, [31][32][33] is controlled by a microcomputer in order to insert the sample slugs and the reagent solution into the analytical path. This resource was used in order to reduce both reagent consumption and waste generation.…”

Section: Introductionmentioning

confidence: 99%

A multicommuted flow analysis method for the photometric determination of amoxicillin in pharmaceutical formulations using a diazo coupling reaction

Freitas¹,

Silva²,

Araújo³

et al. 2011

J. Braz. Chem. Soc.

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Neste trabalho foi proposto um método de análise em fluxo por multicomutação para a determinação de amoxicilina em formulações farmacêuticas. O método proposto é baseado na reação de diazotização da o-nitroanilina com amoxicilina em meio alcalino, produzindo um composto amarelo que foi monitorado em 435 nm. As características do método foram: faixa linear de 25 até 400 mg L -1 de amoxicilina, limite de detecção de 5,1 mg L -1 , frequência analítica de 50 determinações por hora e desvio padrão relativo inferior a 3,9% (n = 10) para uma amostra típica de 100 mg L -1 amoxicilina. Para verificar a exatidão do método, as amostras foram analisadas empregando um método independente e aplicando-se o teste-t pareado não houve diferença significativa no nível de confiança de 95%.A multicommuted flow analysis method for the spectrophotometric determination of amoxicillin in pharmaceutical formulations is reported. The proposed method is based on the reaction of diazotised o-nitroaniline with amoxicillin in an alkaline medium, producing a yellow compound that was monitored at 435 nm. The main features of the method were: a linear relationship with amoxicillin concentration ranging from 25 to 400 mg L -1 ; a detection limit of 5.1 mg L -1; an analytical throughput of 50 determinations per hour; and a relative standard deviation lower than 3.9% for a typical amoxicillin sample with concentration of 100 mg L -1 (n = 10). To verify the accuracy of the method, samples were also analyzed employing an independent method, and applying the paired t-test to the results no significant difference at the 95% confidence level was observed.

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“…The FIA methods with no preconcentration step (Pascual-Reguera et al 1997) present a very high detection limit, whereas other FIA methods with a preconcentration step (Blain and Treguer 1995) present low detection limits but still have some disadvantages such as high reagent consumption and high effluent generation. Other existing flow approaches such as SIA (Morais et al 2005), multicommutated flow (Feres and Reis 2005), and multisyringe flow injection (Gomes et al 2005) present lower reagent consumption but still inadequate detection limits for natural water samples.…”

Section: Introductionmentioning

confidence: 99%

Sequential injection trace determination of iron in natural waters using a long‐pathlength liquid core waveguide and different spectrophotometric chemistries

Páscoa

Tóth

Rangel

2009

Limnology & Ocean Methods

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We developed a sequential injection analysis (SIA) method for the determination of iron in coastal, ground, and surface fresh waters using two different reagents (ferrozine and 1,10-phenathroline). The methodology uses a double-line SIA system to improve mixing conditions between sample and reagent solutions. A liquid waveguide capillary cell (LWCC) with 1.0 m pathlength, 550 µm i.d., and 250 µL internal volume was used to enhance the sensitivity of the determination. The detection limits for the ferrozine and 1,10-phenanthroline reagent were 0.15 and 0.35 µg L -1 , respectively. The system provides a linear response up to 20 µg L -1 and has a high throughput rate (41 h -1 ), low reagent consumption, and also low effluent production for both reagents. The developed method was applied to natural waters (river, well, ground, potable, and sea waters) and one reference water sample.

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A downsized flow set up based on multicommutation for the sequential photometric determination of iron(II)/iron(III) and nitrite/nitrate in surface water

Cited by 51 publications

References 23 publications

Determination of Iron Species in Samples of Iron-Fortified Food

Determination of Iron Species in Samples of Iron-Fortified Food

A multicommuted flow analysis method for the photometric determination of amoxicillin in pharmaceutical formulations using a diazo coupling reaction

Sequential injection trace determination of iron in natural waters using a long‐pathlength liquid core waveguide and different spectrophotometric chemistries

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