Flow spectrophotometric determination of ammonium ion

Catalá-Icardo, Mónica; Torró, Iolanda; Calatayud, J. Martı́nez

doi:10.1016/s0003-2670(99)00384-0

Cited by 14 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…24,25 Bromopyrogallol red [2-(2,7-dibromo-4,5,6-trihydroxy-3-oxo-3H-xanthen-9-yl)benzenesulphonic acid, BPR], a metal sensitive dye, is a widely used xanthene ligand. BPR has been applied to the spectrophotometric determination of many substances, such as molybdenum, 26 tin, 27 cetylpyridinium chloride, 28 ammonium ion 29 and bismuth; 30 and adsorptive anodic stripping voltammetric determination of bismuth. 31 In this paper a cloud point extraction followed by spectrophotometric determination of bismuth is described.…”

Section: Introductionmentioning

confidence: 99%

Cloud point extraction spectrophotometric determination of trace quantities of bismuth in urine

Afkhami¹,

Madrakian²,

Siampour³

2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Investigamos o processo de extração no ponto-nuvem para bismuto, a partir de soluções aquosas, usando o surfactante não-iônico Triton X-114. O método consiste na reação de complexação do Bi(III) com vermelho de bromopirogalol e extração mediada pelo sistema micelar. As condições ótimas de extração e reação (pH, concentração de reagentes, efeito do tempo de incubação etc.) foram estudadas, e as características analíticas do método (por exemplo, limite de detecção, intervalo de linearidade) foram estabelecidas. Uma resposta linear para o íon Bi(III) foi obtida no intervalo de 4,60-120,0 ng mL -1 . O limite de detecção obtido foi de 2,0 ng mL -1 . O efeito da interferência de alguns ânions e cátions foi também testado. O método foi aplicado para a determinação de bismuto em amostras de urina humana.A cloud point extraction process using the nonionic surfactant Triton X-114 to extract bismuth from aqueous solutions was investigated. The method is based on the complexation reaction of Bi(III) with bromopyrogallol red (BPR) and micelle-mediated extraction of the complex. The optimal extraction and reaction conditions (e.g., pH, reagent concentration, effect of time) were studied, and the analytical characteristics of the method (e.g., limit of detection, linear range) were obtained. Linearity was obeyed in the range of 4.60-120.0 ng mL -1 of Bi(III) ion. The detection limit of the method was 2.0 ng mL -1 of Bi(III) ion. The interference effect of some anions and cations was also tested. The method was applied to the determination of bismuth in human urine sample.

show abstract

Section: Introductionmentioning

confidence: 99%

Cloud point extraction spectrophotometric determination of trace quantities of bismuth in urine

Afkhami¹,

Madrakian²,

Siampour³

2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Due to an increasing environmental awareness and stricter regulations for pollution control, a large number of studies have been demonstrated to determine NH 4 + ion in water. These include flow spectrophotometric [15], solvent extraction spectrophotometric [16], UV-VIS spectrophotometric [8], potentiometric [17,18], flow injection analysis with fluorometric [19], amperometric methods [1,9], molecular method with ammonia-oxidizing bacteria [20][21][22], continuous colorimetric assays [3,23], and fluorometric [4,24]. However, these methods are either time consuming or require elaborate preparation procedures.…”

Section: Nhmentioning

confidence: 99%

An Amperometric Biosensor Based on Alanine Dehydrogenase for the Determination of Low Level of Ammonium Ion in Water

2011

View full text Add to dashboard Cite

An amperometric electrochemical biosensor has been developed for ammonium (NH4+) ion detection by immobilising alanine dehydrogenase (AlaDH) enzyme in a photocurable methacrylic membrane made up of poly(2-hydroxyethyl methacrylate) (pHEMA) on a screen-printed carbon paste electrode (SPE). The current detected was based on the electrocatalytic oxidation of nicotinamide adenine dinucleotide reduced (NADH) that is proportional to the consumption ofNH4+ion whilst enzymatic amination of AlaDH and pyruvate is taking place. The biosensor was operated amperometrically at a potential of +0.6 V and optimum pH 7. TheNH4+biosensor demonstrated linear response toNH4+ion concentration in the range of 0.03–1.02 mg/L with a limit of detection (LOD) of 8.52 μg/L. The proposed method has been successfully applied to the determination ofNH4+ion in river water samples without any pretreatment. The levels of possible interferents in the waters were negligible to cause any interference on the proposed method. The analytical performance of the biosensor was comparable to the colorimetric method using Nesslerisation but with much lower detection limit and linear response range at ppb level.

show abstract

“…1,10-phenanthroline (phen) and its derivatives are used as chelating agents for the determination of several chemical species [1] using different analytical techniques including spectrophotometry [2,3,4,5,6], chemiluminescence [7], fluorometry [8], atomic absorption spectrometry [9], thermometry [10], chromatography [11,12] conductometry [13], voltammetry [14,15], amperometry [16], and potentiometry [17,18]. On the other hand, metal complexes of 1,10-phenanthroline and its derivatives have been used as lipophilic counter ions in the construction of several potentiometric sensors for some anionic species [19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

A novel 1,10-phenanthroline-sensitive membrane sensor for potentiometric determination of Hg(II) and Cu(II) cations

2003

View full text Add to dashboard Cite

Preparation, characterization, and applications of a 1,10-phenanthrolinium cation (phenH(+))-sensitive potentiometric sensor are described. The sensor incorporates a liquid polymeric membrane consisting of phenH-tetraphenylborate, nitrophenyloctyl ether, and poly(vinyl chloride) as ion exchanger, plasticizer, and polymeric support, respectively. The sensor exhibits a fast and Nernstian response to phenH(+) over the concentration range of 6 x 10(-6)-2 x 10(-4) M with a monovalent cationic slope of 58.0+/-0.5 mV/log[phenH(+)] in acetate buffer of pH 4.2. The sensor is successfully applied to the monitoring of the potentiometric titration of Hg(II) and Cu(II) ions with phen solution in the presence of citrate and acetate buffers of pH 4.2, respectively. Sharp inflection breaks (90-180 mV) at 1:1 (metal:phen reaction) are obtained in the presence of chloride and thiocyanate background. This stoichiometry is explained by the formation of insoluble [HgCl(2)(phen)], [Hg(SCN)(2)(phen)], and [Cu(SCN)(2)(phen)] complexes. Optimization of each titration and the effect of foreign ions are evaluated. The method offers the advantages of adequate sensitivity, accuracy, and selectivity for the determination of mercury and copper in pharmaceutical, rock, and tea samples. The results are in good agreement with those obtained using the standard atomic absorption spectrometric and United States Pharmacopeial methods.

show abstract

Flow spectrophotometric determination of ammonium ion

Cited by 14 publications

References 33 publications

Cloud point extraction spectrophotometric determination of trace quantities of bismuth in urine

Cloud point extraction spectrophotometric determination of trace quantities of bismuth in urine

An Amperometric Biosensor Based on Alanine Dehydrogenase for the Determination of Low Level of Ammonium Ion in Water

A novel 1,10-phenanthroline-sensitive membrane sensor for potentiometric determination of Hg(II) and Cu(II) cations

Contact Info

Product

Resources

About