Determination of trace amounts of phosphate by flow-injection photometry

Karthikeyan, Sathrugnan; Hashigaya, Seigo; Kajiya, Tasuku; Hirata, Shizuko

doi:10.1007/s00216-004-2501-9

Cited by 20 publications

(13 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak intensity at the GRC electrode was several-times larger than that at the platinum electrode. The first reason for this experimental fact is a difference between the adsorption behaviors of 12 5-. It has been reported that GRC is a functional material that can strongly adsorb many kinds of materials.…”

Section: Reagentsmentioning

confidence: 99%

See 1 more Smart Citation

Laser-Heating Thermal Modulation Voltammetric Determination of Phosphate Ion Using a Graphite-Reinforced Carbon Electrode

et al. 2009

View full text Add to dashboard Cite

12O40]3-), was formed through a reaction between a phosphate ion and molybdate ions in an acidic solution, and its electroreduction was examined in a flow electrolytic cell by TM voltammetry. Measured TM voltammograms showed two peaks corresponding to two successive two-electron reductions of the 12-molybdophosphate ion, and the peak intensities were proportional to the concentration of the phosphate ion. Because of the strong adsorption of 12-molybdophosphate ion onto the GRC electrode, a detection limit as low as 0.8 nmol dm -3 (S/N = 3) was achieved. The determination of phosphate ion in real samples (river water) was carried out by spectrophotometry (the molybdenumblue method) and TM voltammetry, and the determination values obtained by both methods were in a good agreement with each other. These results prove the possibility of TM voltammetry as an electroanalytical method.

show abstract

Section: Reagentsmentioning

confidence: 99%

“…[9][10][11][12] In recent years, many methods for the determination of phosphate ion have been developed. Among them, spectrophotometry based on a chemical reduction of molybdophosphate ion (the molybdenum-blue method) is a representative, and its various versions have been proposed in compliance with many analytical requests.…”

Section: Introductionmentioning

confidence: 99%

Laser-Heating Thermal Modulation Voltammetric Determination of Phosphate Ion Using a Graphite-Reinforced Carbon Electrode

et al. 2009

View full text Add to dashboard Cite

show abstract

“…DRP is an operational definition for soluble phosphate which passes a 0.45 µm filter and can be measured colorimetrically [5] [6]. However, some inorganic condensed phosphorus (e.g.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Profiles of Dissolved Reactive Phosphorus in the Porewaters of Lake Sediments Assessed by DGT Technique

Wang¹,

Zhang²,

Xie³

et al. 2014

JEP

View full text Add to dashboard Cite

The technique of DGT (diffusive gradients in thin films) was applied to obtain high-resolution vertical profiles of dissolved reactive phosphorus (DRP) in sediment porewater of Lake Chaohu, a shallow eutrophication lake. Three kinds of DGT probes (with three thicknesses of diffusive gel: 0.38 mm, 0.78 mm and 1.18 mm) measured vertical concentration and induced flux from solid to solution phase which had intricate variations with depth. The results indicated that higher concentrations and induced fluxes of DRP were achieved by using DGT probe with thicker diffusion layer (CDGT1.18 > CDGT0.78 > CDGT0.38) and relatively stable DRP concentration profiles using DGT probes with 0.78 mm diffusive gel were obtained in each sediment core. The DRP concentrations displayed a clear gradient from Core C1 to Core C3 in sediment porewaters due to different sources and exchange degrees of reactive phosphorus. Compared to the concentrations obtained by the centrifugation technique, the concentrations of DRP resulting from the DGT technique were higher because some dissolved reactive phosphorus compounds have always been neglected using conventional centrifugation method.

show abstract

“…[3][4][5][6] Small size, low cost, high stability of the radiation beam, and long lifetime are the main features of LEDs which explains its widespread use in different analytical procedures. [7][8][9] The availability of LEDs with wavelengths ranging from ultraviolet (l ca. 380 nm) to near infrared (l ca.…”

Section: Introductionmentioning

confidence: 99%

“…2,17 There are a few studies on the use of LEDs as photodetectors. 8,19 The measurement was done using the LED capacitance effect, which presents a relationship da SIlva et al…”

Section: Introductionmentioning

confidence: 99%

Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

Silva¹,

Crispino²,

Reis³

2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Neste trabalho, é descrito um fotômetro de baixo custo baseado em um par de LEDs idênticos, empregando um, como fonte de luz e o outro como fotodetector. O equipamento, incluindo o fotômetro e o módulo de análises, foi projetado para implementar um procedimento de titulação automático empregando o processo de multicomutação por injeção em fluxo (MCFIA). O sistema proposto dispunha de meios para realizar a titulação fotométrica sem a necessidade de empregar curva analítica. A utilidade foi comprovada analisando amostras de vinagre e sucos de limão, laranja, abacaxi, maracujá e cajú. A exatidão foi verificada comparando os resultados com outros, obtidos empregando procedimento manual, e não foi observada diferença significativa no nível de confiança de 95%. Amostras com diferentes concentrações de ácido, tais como suco de limão (1.084,73 mmol L ) foram tituladas usando a mesma solução titulante, e sem modificação do sistema de titulação.In this work, a reliable and inexpensive photometer based on twin LEDs assembled as a radiation source and as a photodetector is described. The setup including the photometer and flow system module was designed to implement an automated titration procedure employing the multicommuted flow injection analysis (MCFIA) process. The proposed system was able to carry out photometric titration without using analytical curve to achieve the sample concentration. Its usefulness was proven by analyzing vinegar and lemon, orange, pineapple, maracock, and acajou juices. Accuracy was accessed comparing results with those obtained employing a manual procedure and no significant difference was observed at 95% confidence level. Samples presenting different acid concentrations such as lemon juice (1084.73 mmol L -1 ) and pineapple juice (14.42 mmol L -1 ) could be titrated using the same titration solution without any modification of the titrating setup.

show abstract

Determination of trace amounts of phosphate by flow-injection photometry

Cited by 20 publications

References 20 publications

Laser-Heating Thermal Modulation Voltammetric Determination of Phosphate Ion Using a Graphite-Reinforced Carbon Electrode

Laser-Heating Thermal Modulation Voltammetric Determination of Phosphate Ion Using a Graphite-Reinforced Carbon Electrode

High-Resolution Profiles of Dissolved Reactive Phosphorus in the Porewaters of Lake Sediments Assessed by DGT Technique

Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

Contact Info

Product

Resources

About